diff --git a/Cargo.lock b/Cargo.lock
index 4883465..8501b66 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -11,6 +11,15 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anstream"
 version = "0.6.21"
@@ -90,6 +99,12 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "bumpalo"
+version = "3.19.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5dd9dc738b7a8311c7ade152424974d8115f2cdad61e8dab8dac9f2362298510"
+
 [[package]]
 name = "bytes"
 version = "1.11.0"
@@ -145,6 +160,20 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "chrono"
+version = "0.4.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "145052bdd345b87320e369255277e3fb5152762ad123a901ef5c262dd38fe8d2"
+dependencies = [
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "serde",
+ "wasm-bindgen",
+ "windows-link",
+]
+
 [[package]]
 name = "clap"
 version = "4.5.53"
@@ -191,6 +220,12 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b05b61dc5112cbb17e4b6cd61790d9845d13888356391624cbe7e41efeac1e75"
 
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
+
 [[package]]
 name = "dirs"
 version = "5.0.1"
@@ -267,6 +302,12 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "645cbb3a84e60b7531617d5ae4e57f7e27308f6445f5abf653209ea76dec8dff"
 
+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
 [[package]]
 name = "freedesktop-desktop-entry"
 version = "0.7.19"
@@ -694,6 +735,30 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
+[[package]]
+name = "iana-time-zone"
+version = "0.1.64"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33e57f83510bb73707521ebaffa789ec8caf86f9657cad665b092b581d40e9fb"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "log",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "indexmap"
 version = "2.12.1"
@@ -710,6 +775,12 @@ version = "1.70.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a6cb138bb79a146c1bd460005623e142ef0181e3d0219cb493e02f7d08a35695"
 
+[[package]]
+name = "itoa"
+version = "1.0.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "92ecc6618181def0457392ccd0ee51198e065e016d1d527a7ac1b6dc7c1f09d2"
+
 [[package]]
 name = "jiff"
 version = "0.2.17"
@@ -734,6 +805,16 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "js-sys"
+version = "0.3.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "464a3709c7f55f1f721e5389aa6ea4e3bc6aba669353300af094b29ffbdde1d8"
+dependencies = [
+ "once_cell",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "khronos_api"
 version = "3.1.0"
@@ -805,6 +886,16 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "meval"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f79496a5651c8d57cd033c5add8ca7ee4e3d5f7587a4777484640d9cb60392d9"
+dependencies = [
+ "fnv",
+ "nom",
+]
+
 [[package]]
 name = "mio"
 version = "1.1.1"
@@ -816,6 +907,21 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "nom"
+version = "1.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a5b8c256fd9471521bcb84c3cdba98921497f1a331cbc15b8030fc63b82050ce"
+
+[[package]]
+name = "num-traits"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "objc"
 version = "0.2.7"
@@ -845,6 +951,12 @@ dependencies = [
  "objc",
 ]
 
+[[package]]
+name = "once_cell"
+version = "1.21.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
+
 [[package]]
 name = "once_cell_polyfill"
 version = "1.70.2"
@@ -859,8 +971,9 @@ checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
 
 [[package]]
 name = "owlry"
-version = "0.1.8"
+version = "0.1.9"
 dependencies = [
+ "chrono",
  "clap",
  "dirs",
  "env_logger",
@@ -870,7 +983,9 @@ dependencies = [
  "gtk4-layer-shell",
  "libc",
  "log",
+ "meval",
  "serde",
+ "serde_json",
  "thiserror 2.0.17",
  "tokio",
  "toml 0.8.23",
@@ -1009,6 +1124,12 @@ dependencies = [
  "semver",
 ]
 
+[[package]]
+name = "rustversion"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
+
 [[package]]
 name = "semver"
 version = "1.0.27"
@@ -1045,6 +1166,19 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "serde_json"
+version = "1.0.148"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3084b546a1dd6289475996f182a22aba973866ea8e8b02c51d9f46b1336a22da"
+dependencies = [
+ "itoa",
+ "memchr",
+ "serde",
+ "serde_core",
+ "zmij",
+]
+
 [[package]]
 name = "serde_spanned"
 version = "0.6.9"
@@ -1318,6 +1452,51 @@ version = "0.11.1+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
 
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.106"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d759f433fa64a2d763d1340820e46e111a7a5ab75f993d1852d70b03dbb80fd"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "rustversion",
+ "wasm-bindgen-macro",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.106"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48cb0d2638f8baedbc542ed444afc0644a29166f1595371af4fecf8ce1e7eeb3"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.106"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cefb59d5cd5f92d9dcf80e4683949f15ca4b511f4ac0a6e14d4e1ac60c6ecd40"
+dependencies = [
+ "bumpalo",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.106"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cbc538057e648b67f72a982e708d485b2efa771e1ac05fec311f9f63e5800db4"
+dependencies = [
+ "unicode-ident",
+]
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -1340,12 +1519,65 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
+[[package]]
+name = "windows-core"
+version = "0.62.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8e83a14d34d0623b51dce9581199302a221863196a1dde71a7663a4c2be9deb"
+dependencies = [
+ "windows-implement",
+ "windows-interface",
+ "windows-link",
+ "windows-result",
+ "windows-strings",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.60.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "windows-interface"
+version = "0.59.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
 
+[[package]]
+name = "windows-result"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7781fa89eaf60850ac3d2da7af8e5242a5ea78d1a11c49bf2910bb5a73853eb5"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-strings"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
+dependencies = [
+ "windows-link",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.48.0"
@@ -1514,3 +1746,9 @@ name = "xml-rs"
 version = "0.8.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3ae8337f8a065cfc972643663ea4279e04e7256de865aa66fe25cec5fb912d3f"
+
+[[package]]
+name = "zmij"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6d6085d62852e35540689d1f97ad663e3971fc19cf5eceab364d62c646ea167"
diff --git a/Cargo.toml b/Cargo.toml
index 1775845..79d0f27 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "owlry"
-version = "0.1.8"
+version = "0.1.9"
 edition = "2024"
 rust-version = "1.90"
 description = "A lightweight, owl-themed application launcher for Wayland"
@@ -46,6 +46,15 @@ toml = "0.8"
 # CLI argument parsing
 clap = { version = "4", features = ["derive"] }
 
+# Math expression evaluation for calculator
+meval = "0.2"
+
+# JSON serialization for data persistence
+serde_json = "1"
+
+# Date/time for frecency calculations
+chrono = { version = "0.4", features = ["serde"] }
+
 [profile.release]
 lto = true
 codegen-units = 1
diff --git a/config.example.toml b/config.example.toml
index 1be1e74..cf2d159 100644
--- a/config.example.toml
+++ b/config.example.toml
@@ -32,6 +32,7 @@ border_radius = 12
 # accent = "#7aa2f7"
 # accent_bright = "#89b4fa"
 # badge_app = "#9ece6a"
+# badge_calc = "#e0af68"
 # badge_cmd = "#7aa2f7"
 # badge_dmenu = "#bb9af7"
 # badge_uuctl = "#f7768e"
@@ -40,3 +41,10 @@ border_radius = 12
 applications = true
 commands = true
 uuctl = true
+
+# Calculator provider (type "= 5+3" or "calc 5+3")
+calculator = true
+
+# Frecency: boost frequently/recently used items in search results
+frecency = true
+frecency_weight = 0.3  # 0.0 = disabled, 1.0 = strong boost
diff --git a/resources/base.css b/resources/base.css
index ab93575..0c57997 100644
--- a/resources/base.css
+++ b/resources/base.css
@@ -106,6 +106,11 @@
     color: var(--owlry-badge-app, @blue_3);
 }
 
+.owlry-badge-calc {
+    background-color: alpha(var(--owlry-badge-calc, @yellow_3), 0.2);
+    color: var(--owlry-badge-calc, @yellow_3);
+}
+
 .owlry-badge-cmd {
     background-color: alpha(var(--owlry-badge-cmd, @purple_3), 0.2);
     color: var(--owlry-badge-cmd, @purple_3);
@@ -166,6 +171,12 @@
     border-color: alpha(var(--owlry-badge-app, @blue_3), 0.4);
 }
 
+.owlry-filter-calc:checked {
+    background-color: alpha(var(--owlry-badge-calc, @yellow_3), 0.2);
+    color: var(--owlry-badge-calc, @yellow_3);
+    border-color: alpha(var(--owlry-badge-calc, @yellow_3), 0.4);
+}
+
 .owlry-filter-cmd:checked {
     background-color: alpha(var(--owlry-badge-cmd, @purple_3), 0.2);
     color: var(--owlry-badge-cmd, @purple_3);
diff --git a/src/app.rs b/src/app.rs
index ddec144..0d2a51d 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -1,5 +1,6 @@
 use crate::cli::CliArgs;
 use crate::config::Config;
+use crate::data::FrecencyStore;
 use crate::filter::ProviderFilter;
 use crate::providers::ProviderManager;
 use crate::theme;
@@ -40,6 +41,7 @@ impl OwlryApp {
 
         let config = Rc::new(RefCell::new(Config::load_or_default()));
         let providers = Rc::new(RefCell::new(ProviderManager::new()));
+        let frecency = Rc::new(RefCell::new(FrecencyStore::load_or_default()));
 
         // Create filter from CLI args and config
         let filter = ProviderFilter::new(
@@ -49,7 +51,7 @@ impl OwlryApp {
         );
         let filter = Rc::new(RefCell::new(filter));
 
-        let window = MainWindow::new(app, config.clone(), providers.clone(), filter.clone());
+        let window = MainWindow::new(app, config.clone(), providers.clone(), frecency.clone(), filter.clone());
 
         // Set up layer shell for Wayland overlay behavior
         window.init_layer_shell();
diff --git a/src/config/mod.rs b/src/config/mod.rs
index 7aca0a4..5d985e4 100644
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -35,6 +35,7 @@ pub struct ThemeColors {
     pub accent_bright: Option<String>,
     // Provider badge colors
     pub badge_app: Option<String>,
+    pub badge_calc: Option<String>,
     pub badge_cmd: Option<String>,
     pub badge_dmenu: Option<String>,
     pub badge_uuctl: Option<String>,
@@ -59,6 +60,23 @@ pub struct ProvidersConfig {
     pub applications: bool,
     pub commands: bool,
     pub uuctl: bool,
+    /// Enable calculator provider (= expression or calc expression)
+    #[serde(default = "default_true")]
+    pub calculator: bool,
+    /// Enable frecency-based result ranking
+    #[serde(default = "default_true")]
+    pub frecency: bool,
+    /// Weight for frecency boost (0.0 = disabled, 1.0 = strong boost)
+    #[serde(default = "default_frecency_weight")]
+    pub frecency_weight: f64,
+}
+
+fn default_true() -> bool {
+    true
+}
+
+fn default_frecency_weight() -> f64 {
+    0.3
 }
 
 /// Detect the best launch wrapper for the current session
@@ -172,6 +190,9 @@ impl Default for Config {
                 applications: true,
                 commands: true,
                 uuctl: true,
+                calculator: true,
+                frecency: true,
+                frecency_weight: 0.3,
             },
         }
     }
diff --git a/src/data/frecency.rs b/src/data/frecency.rs
new file mode 100644
index 0000000..357cb70
--- /dev/null
+++ b/src/data/frecency.rs
@@ -0,0 +1,223 @@
+use chrono::{DateTime, Utc};
+use log::{debug, info, warn};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use std::path::PathBuf;
+
+/// A single frecency entry tracking launch count and recency
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct FrecencyEntry {
+    pub launch_count: u32,
+    pub last_launch: DateTime<Utc>,
+}
+
+/// Persistent frecency data store
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct FrecencyData {
+    pub version: u32,
+    pub entries: HashMap<String, FrecencyEntry>,
+}
+
+impl Default for FrecencyData {
+    fn default() -> Self {
+        Self {
+            version: 1,
+            entries: HashMap::new(),
+        }
+    }
+}
+
+/// Frecency store for tracking and boosting recently/frequently used items
+pub struct FrecencyStore {
+    data: FrecencyData,
+    path: PathBuf,
+    dirty: bool,
+}
+
+impl FrecencyStore {
+    /// Create a new frecency store, loading existing data if available
+    pub fn new() -> Self {
+        let path = Self::data_path();
+        let data = Self::load_from_path(&path).unwrap_or_default();
+
+        info!("Frecency store loaded with {} entries", data.entries.len());
+
+        Self {
+            data,
+            path,
+            dirty: false,
+        }
+    }
+
+    /// Alias for new() - loads from disk or creates default
+    pub fn load_or_default() -> Self {
+        Self::new()
+    }
+
+    /// Get the path to the frecency data file
+    fn data_path() -> PathBuf {
+        dirs::data_dir()
+            .unwrap_or_else(|| PathBuf::from("."))
+            .join("owlry")
+            .join("frecency.json")
+    }
+
+    /// Load frecency data from a file
+    fn load_from_path(path: &PathBuf) -> Option<FrecencyData> {
+        if !path.exists() {
+            debug!("Frecency file not found at {:?}", path);
+            return None;
+        }
+
+        let content = std::fs::read_to_string(path).ok()?;
+        match serde_json::from_str(&content) {
+            Ok(data) => Some(data),
+            Err(e) => {
+                warn!("Failed to parse frecency data: {}", e);
+                None
+            }
+        }
+    }
+
+    /// Save frecency data to disk
+    pub fn save(&mut self) -> Result<(), Box<dyn std::error::Error>> {
+        if !self.dirty {
+            return Ok(());
+        }
+
+        // Ensure directory exists
+        if let Some(parent) = self.path.parent() {
+            std::fs::create_dir_all(parent)?;
+        }
+
+        let content = serde_json::to_string_pretty(&self.data)?;
+        std::fs::write(&self.path, content)?;
+        self.dirty = false;
+
+        debug!("Frecency data saved to {:?}", self.path);
+        Ok(())
+    }
+
+    /// Record a launch event for an item
+    pub fn record_launch(&mut self, item_id: &str) {
+        let now = Utc::now();
+
+        let entry = self
+            .data
+            .entries
+            .entry(item_id.to_string())
+            .or_insert(FrecencyEntry {
+                launch_count: 0,
+                last_launch: now,
+            });
+
+        entry.launch_count += 1;
+        entry.last_launch = now;
+        self.dirty = true;
+
+        debug!(
+            "Recorded launch for '{}': count={}, last={}",
+            item_id, entry.launch_count, entry.last_launch
+        );
+
+        // Auto-save after recording
+        if let Err(e) = self.save() {
+            warn!("Failed to save frecency data: {}", e);
+        }
+    }
+
+    /// Calculate frecency score for an item
+    /// Uses Firefox-style algorithm: score = launch_count * recency_weight
+    pub fn get_score(&self, item_id: &str) -> f64 {
+        match self.data.entries.get(item_id) {
+            Some(entry) => Self::calculate_frecency(entry.launch_count, entry.last_launch),
+            None => 0.0,
+        }
+    }
+
+    /// Calculate frecency using Firefox-style algorithm
+    fn calculate_frecency(launch_count: u32, last_launch: DateTime<Utc>) -> f64 {
+        let now = Utc::now();
+        let age = now.signed_duration_since(last_launch);
+        let age_days = age.num_hours() as f64 / 24.0;
+
+        // Recency weight based on how recently the item was used
+        let recency_weight = if age_days < 1.0 {
+            100.0 // Today
+        } else if age_days < 7.0 {
+            70.0 // This week
+        } else if age_days < 30.0 {
+            50.0 // This month
+        } else if age_days < 90.0 {
+            30.0 // This quarter
+        } else {
+            10.0 // Older
+        };
+
+        launch_count as f64 * recency_weight
+    }
+
+    /// Get all entries (for debugging/display)
+    #[allow(dead_code)]
+    pub fn entries(&self) -> &HashMap<String, FrecencyEntry> {
+        &self.data.entries
+    }
+
+    /// Clear all frecency data
+    #[allow(dead_code)]
+    pub fn clear(&mut self) {
+        self.data.entries.clear();
+        self.dirty = true;
+    }
+}
+
+impl Default for FrecencyStore {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Drop for FrecencyStore {
+    fn drop(&mut self) {
+        // Attempt to save on drop
+        if let Err(e) = self.save() {
+            warn!("Failed to save frecency data on drop: {}", e);
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_frecency_calculation() {
+        let now = Utc::now();
+
+        // Recent launch should have high score
+        let score_today = FrecencyStore::calculate_frecency(10, now);
+        assert!(score_today > 900.0); // 10 * 100
+
+        // Older launch should have lower score
+        let week_ago = now - chrono::Duration::days(5);
+        let score_week = FrecencyStore::calculate_frecency(10, week_ago);
+        assert!(score_week < score_today);
+        assert!(score_week > 600.0); // 10 * 70
+
+        // Much older launch
+        let month_ago = now - chrono::Duration::days(45);
+        let score_month = FrecencyStore::calculate_frecency(10, month_ago);
+        assert!(score_month < score_week);
+    }
+
+    #[test]
+    fn test_launch_count_matters() {
+        let now = Utc::now();
+
+        let score_few = FrecencyStore::calculate_frecency(2, now);
+        let score_many = FrecencyStore::calculate_frecency(20, now);
+
+        assert!(score_many > score_few);
+        assert!((score_many / score_few - 10.0).abs() < 0.1); // Should be ~10x
+    }
+}
diff --git a/src/data/mod.rs b/src/data/mod.rs
new file mode 100644
index 0000000..8fc1d1b
--- /dev/null
+++ b/src/data/mod.rs
@@ -0,0 +1,3 @@
+mod frecency;
+
+pub use frecency::FrecencyStore;
diff --git a/src/filter.rs b/src/filter.rs
index 1a0090e..d9b0d6d 100644
--- a/src/filter.rs
+++ b/src/filter.rs
@@ -129,6 +129,8 @@ impl ProviderFilter {
         let prefixes = [
             (":app ", ProviderType::Application),
             (":apps ", ProviderType::Application),
+            (":calc ", ProviderType::Calculator),
+            (":calculator ", ProviderType::Calculator),
             (":cmd ", ProviderType::Command),
             (":command ", ProviderType::Command),
             (":uuctl ", ProviderType::Uuctl),
@@ -147,6 +149,8 @@ impl ProviderFilter {
         let partial_prefixes = [
             (":app", ProviderType::Application),
             (":apps", ProviderType::Application),
+            (":calc", ProviderType::Calculator),
+            (":calculator", ProviderType::Calculator),
             (":cmd", ProviderType::Command),
             (":command", ProviderType::Command),
             (":uuctl", ProviderType::Uuctl),
@@ -172,9 +176,10 @@ impl ProviderFilter {
         let mut providers: Vec<_> = self.enabled.iter().copied().collect();
         providers.sort_by_key(|p| match p {
             ProviderType::Application => 0,
-            ProviderType::Command => 1,
-            ProviderType::Uuctl => 2,
-            ProviderType::Dmenu => 3,
+            ProviderType::Calculator => 1,
+            ProviderType::Command => 2,
+            ProviderType::Uuctl => 3,
+            ProviderType::Dmenu => 4,
         });
         providers
     }
@@ -184,6 +189,7 @@ impl ProviderFilter {
         if let Some(prefix) = self.active_prefix {
             return match prefix {
                 ProviderType::Application => "Apps",
+                ProviderType::Calculator => "Calc",
                 ProviderType::Command => "Commands",
                 ProviderType::Uuctl => "uuctl",
                 ProviderType::Dmenu => "dmenu",
@@ -194,6 +200,7 @@ impl ProviderFilter {
         if enabled.len() == 1 {
             match enabled[0] {
                 ProviderType::Application => "Apps",
+                ProviderType::Calculator => "Calc",
                 ProviderType::Command => "Commands",
                 ProviderType::Uuctl => "uuctl",
                 ProviderType::Dmenu => "dmenu",
diff --git a/src/main.rs b/src/main.rs
index 7eca455..bd4107b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 mod app;
 mod cli;
 mod config;
+mod data;
 mod filter;
 mod providers;
 mod theme;
diff --git a/src/providers/calculator.rs b/src/providers/calculator.rs
new file mode 100644
index 0000000..c3f09e0
--- /dev/null
+++ b/src/providers/calculator.rs
@@ -0,0 +1,191 @@
+use super::{LaunchItem, Provider, ProviderType};
+use log::debug;
+
+/// Calculator provider for evaluating math expressions
+/// Syntax: `= expression` or `calc expression`
+pub struct CalculatorProvider {
+    /// Cached result from last evaluation
+    cached_result: Option<LaunchItem>,
+}
+
+impl CalculatorProvider {
+    pub fn new() -> Self {
+        Self {
+            cached_result: None,
+        }
+    }
+
+    /// Check if a query is a calculator expression
+    pub fn is_calculator_query(query: &str) -> bool {
+        let trimmed = query.trim();
+        trimmed.starts_with("= ") || trimmed.starts_with("calc ")
+    }
+
+    /// Extract the expression from a calculator query
+    fn extract_expression(query: &str) -> Option<&str> {
+        let trimmed = query.trim();
+        if let Some(expr) = trimmed.strip_prefix("= ") {
+            Some(expr.trim())
+        } else if let Some(expr) = trimmed.strip_prefix("calc ") {
+            Some(expr.trim())
+        } else {
+            None
+        }
+    }
+
+    /// Evaluate an expression and return a LaunchItem result
+    pub fn evaluate(&mut self, query: &str) -> Option<LaunchItem> {
+        let expr = Self::extract_expression(query)?;
+
+        if expr.is_empty() {
+            return None;
+        }
+
+        debug!("Evaluating expression: {}", expr);
+
+        match meval::eval_str(expr) {
+            Ok(result) => {
+                // Format result nicely
+                let result_str = if result.fract() == 0.0 && result.abs() < 1e15 {
+                    // Integer result
+                    format!("{}", result as i64)
+                } else {
+                    // Float result with reasonable precision
+                    let formatted = format!("{:.10}", result);
+                    // Trim trailing zeros
+                    formatted.trim_end_matches('0').trim_end_matches('.').to_string()
+                };
+
+                let item = LaunchItem {
+                    id: format!("calc:{}", expr),
+                    name: result_str.clone(),
+                    description: Some(format!("= {}", expr)),
+                    icon: Some("accessories-calculator".to_string()),
+                    provider: ProviderType::Calculator,
+                    // Copy result to clipboard using wl-copy
+                    command: format!("sh -c 'echo -n \"{}\" | wl-copy'", result_str),
+                    terminal: false,
+                };
+
+                debug!("Calculator result: {} = {}", expr, result_str);
+                self.cached_result = Some(item.clone());
+                Some(item)
+            }
+            Err(e) => {
+                debug!("Calculator error for '{}': {}", expr, e);
+                None
+            }
+        }
+    }
+}
+
+impl Provider for CalculatorProvider {
+    fn name(&self) -> &str {
+        "Calculator"
+    }
+
+    fn provider_type(&self) -> ProviderType {
+        ProviderType::Calculator
+    }
+
+    fn refresh(&mut self) {
+        // Calculator doesn't need refresh - it evaluates on-demand
+        self.cached_result = None;
+    }
+
+    fn items(&self) -> &[LaunchItem] {
+        // Calculator is a dynamic provider - items are generated from query
+        // Return cached result if available (for UI display)
+        match &self.cached_result {
+            Some(item) => std::slice::from_ref(item),
+            None => &[],
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_is_calculator_query() {
+        assert!(CalculatorProvider::is_calculator_query("= 5+3"));
+        assert!(CalculatorProvider::is_calculator_query("calc 5+3"));
+        assert!(CalculatorProvider::is_calculator_query("  = 5+3"));
+        assert!(!CalculatorProvider::is_calculator_query("5+3"));
+        assert!(!CalculatorProvider::is_calculator_query("firefox"));
+    }
+
+    #[test]
+    fn test_extract_expression() {
+        assert_eq!(
+            CalculatorProvider::extract_expression("= 5+3"),
+            Some("5+3")
+        );
+        assert_eq!(
+            CalculatorProvider::extract_expression("calc 5+3"),
+            Some("5+3")
+        );
+        assert_eq!(
+            CalculatorProvider::extract_expression("=  5 + 3 "),
+            Some("5 + 3")
+        );
+        assert_eq!(CalculatorProvider::extract_expression("5+3"), None);
+    }
+
+    #[test]
+    fn test_evaluate_basic() {
+        let mut calc = CalculatorProvider::new();
+
+        let result = calc.evaluate("= 5+3").unwrap();
+        assert_eq!(result.name, "8");
+
+        let result = calc.evaluate("= 10 * 2").unwrap();
+        assert_eq!(result.name, "20");
+
+        let result = calc.evaluate("= 15 / 3").unwrap();
+        assert_eq!(result.name, "5");
+    }
+
+    #[test]
+    fn test_evaluate_float() {
+        let mut calc = CalculatorProvider::new();
+
+        let result = calc.evaluate("= 5/2").unwrap();
+        assert_eq!(result.name, "2.5");
+
+        let result = calc.evaluate("= 1/3").unwrap();
+        assert!(result.name.starts_with("0.333"));
+    }
+
+    #[test]
+    fn test_evaluate_functions() {
+        let mut calc = CalculatorProvider::new();
+
+        let result = calc.evaluate("= sqrt(16)").unwrap();
+        assert_eq!(result.name, "4");
+
+        let result = calc.evaluate("= abs(-5)").unwrap();
+        assert_eq!(result.name, "5");
+    }
+
+    #[test]
+    fn test_evaluate_constants() {
+        let mut calc = CalculatorProvider::new();
+
+        let result = calc.evaluate("= pi").unwrap();
+        assert!(result.name.starts_with("3.14159"));
+
+        let result = calc.evaluate("= e").unwrap();
+        assert!(result.name.starts_with("2.718"));
+    }
+
+    #[test]
+    fn test_evaluate_invalid() {
+        let mut calc = CalculatorProvider::new();
+
+        assert!(calc.evaluate("= ").is_none());
+        assert!(calc.evaluate("= invalid").is_none());
+        assert!(calc.evaluate("= 5 +").is_none());
+    }
+}
diff --git a/src/providers/mod.rs b/src/providers/mod.rs
index b825c29..18866e7 100644
--- a/src/providers/mod.rs
+++ b/src/providers/mod.rs
@@ -1,9 +1,11 @@
 mod application;
+mod calculator;
 mod command;
 mod dmenu;
 mod uuctl;
 
 pub use application::ApplicationProvider;
+pub use calculator::CalculatorProvider;
 pub use command::CommandProvider;
 pub use dmenu::DmenuProvider;
 pub use uuctl::UuctlProvider;
@@ -12,6 +14,8 @@ use fuzzy_matcher::FuzzyMatcher;
 use fuzzy_matcher::skim::SkimMatcherV2;
 use log::info;
 
+use crate::data::FrecencyStore;
+
 /// Represents a single searchable/launchable item
 #[derive(Debug, Clone)]
 pub struct LaunchItem {
@@ -28,6 +32,7 @@ pub struct LaunchItem {
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum ProviderType {
     Application,
+    Calculator,
     Command,
     Dmenu,
     Uuctl,
@@ -39,10 +44,14 @@ impl std::str::FromStr for ProviderType {
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         match s.to_lowercase().as_str() {
             "app" | "apps" | "application" | "applications" => Ok(ProviderType::Application),
+            "calc" | "calculator" => Ok(ProviderType::Calculator),
             "cmd" | "command" | "commands" => Ok(ProviderType::Command),
             "uuctl" => Ok(ProviderType::Uuctl),
             "dmenu" => Ok(ProviderType::Dmenu),
-            _ => Err(format!("Unknown provider: '{}'. Valid: app, cmd, uuctl", s)),
+            _ => Err(format!(
+                "Unknown provider: '{}'. Valid: app, calc, cmd, uuctl",
+                s
+            )),
         }
     }
 }
@@ -51,6 +60,7 @@ impl std::fmt::Display for ProviderType {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
             ProviderType::Application => write!(f, "app"),
+            ProviderType::Calculator => write!(f, "calc"),
             ProviderType::Command => write!(f, "cmd"),
             ProviderType::Dmenu => write!(f, "dmenu"),
             ProviderType::Uuctl => write!(f, "uuctl"),
@@ -70,6 +80,7 @@ pub trait Provider: Send {
 /// Manages all providers and handles searching
 pub struct ProviderManager {
     providers: Vec<Box<dyn Provider>>,
+    calculator: CalculatorProvider,
     matcher: SkimMatcherV2,
 }
 
@@ -77,6 +88,7 @@ impl ProviderManager {
     pub fn new() -> Self {
         let mut manager = Self {
             providers: Vec::new(),
+            calculator: CalculatorProvider::new(),
             matcher: SkimMatcherV2::default(),
         };
 
@@ -206,6 +218,79 @@ impl ProviderManager {
         results
     }
 
+    /// Search with frecency boosting and calculator support
+    pub fn search_with_frecency(
+        &mut self,
+        query: &str,
+        max_results: usize,
+        filter: &crate::filter::ProviderFilter,
+        frecency: &FrecencyStore,
+        frecency_weight: f64,
+    ) -> Vec<(LaunchItem, i64)> {
+        let mut results: Vec<(LaunchItem, i64)> = Vec::new();
+
+        // Check for calculator query first
+        if CalculatorProvider::is_calculator_query(query) {
+            if let Some(calc_result) = self.calculator.evaluate(query) {
+                // Calculator results get a high score to appear first
+                results.push((calc_result, 10000));
+            }
+        }
+
+        // Empty query (after checking calculator) - return frecency-sorted items
+        if query.is_empty() {
+            let mut items: Vec<(LaunchItem, i64)> = self
+                .providers
+                .iter()
+                .filter(|p| filter.is_active(p.provider_type()))
+                .flat_map(|p| p.items().iter().cloned())
+                .map(|item| {
+                    let frecency_score = frecency.get_score(&item.id);
+                    let boosted = (frecency_score * frecency_weight * 100.0) as i64;
+                    (item, boosted)
+                })
+                .collect();
+
+            items.sort_by(|a, b| b.1.cmp(&a.1));
+            items.truncate(max_results);
+            return items;
+        }
+
+        // Regular search with frecency boost
+        let search_results: Vec<(LaunchItem, i64)> = self
+            .providers
+            .iter()
+            .filter(|provider| filter.is_active(provider.provider_type()))
+            .flat_map(|provider| {
+                provider.items().iter().filter_map(|item| {
+                    let name_score = self.matcher.fuzzy_match(&item.name, query);
+                    let desc_score = item
+                        .description
+                        .as_ref()
+                        .and_then(|d| self.matcher.fuzzy_match(d, query));
+
+                    let base_score = match (name_score, desc_score) {
+                        (Some(n), Some(d)) => Some(n.max(d)),
+                        (Some(n), None) => Some(n),
+                        (None, Some(d)) => Some(d / 2),
+                        (None, None) => None,
+                    };
+
+                    base_score.map(|s| {
+                        let frecency_score = frecency.get_score(&item.id);
+                        let frecency_boost = (frecency_score * frecency_weight * 10.0) as i64;
+                        (item.clone(), s + frecency_boost)
+                    })
+                })
+            })
+            .collect();
+
+        results.extend(search_results);
+        results.sort_by(|a, b| b.1.cmp(&a.1));
+        results.truncate(max_results);
+        results
+    }
+
     /// Get all available provider types (for UI tabs)
     #[allow(dead_code)]
     pub fn available_providers(&self) -> Vec<ProviderType> {
diff --git a/src/theme.rs b/src/theme.rs
index b99c040..91da83e 100644
--- a/src/theme.rs
+++ b/src/theme.rs
@@ -35,6 +35,9 @@ pub fn generate_variables_css(config: &AppearanceConfig) -> String {
     if let Some(ref badge_app) = config.colors.badge_app {
         css.push_str(&format!("    --owlry-badge-app: {};\n", badge_app));
     }
+    if let Some(ref badge_calc) = config.colors.badge_calc {
+        css.push_str(&format!("    --owlry-badge-calc: {};\n", badge_calc));
+    }
     if let Some(ref badge_cmd) = config.colors.badge_cmd {
         css.push_str(&format!("    --owlry-badge-cmd: {};\n", badge_cmd));
     }
diff --git a/src/ui/main_window.rs b/src/ui/main_window.rs
index 6cdc94c..7a44085 100644
--- a/src/ui/main_window.rs
+++ b/src/ui/main_window.rs
@@ -1,4 +1,5 @@
 use crate::config::Config;
+use crate::data::FrecencyStore;
 use crate::filter::ProviderFilter;
 use crate::providers::{LaunchItem, ProviderManager, ProviderType, UuctlProvider};
 use crate::ui::ResultRow;
@@ -36,6 +37,7 @@ pub struct MainWindow {
     scrolled: ScrolledWindow,
     config: Rc<RefCell<Config>>,
     providers: Rc<RefCell<ProviderManager>>,
+    frecency: Rc<RefCell<FrecencyStore>>,
     current_results: Rc<RefCell<Vec<LaunchItem>>>,
     filter: Rc<RefCell<ProviderFilter>>,
     mode_label: Label,
@@ -49,6 +51,7 @@ impl MainWindow {
         app: &Application,
         config: Rc<RefCell<Config>>,
         providers: Rc<RefCell<ProviderManager>>,
+        frecency: Rc<RefCell<FrecencyStore>>,
         filter: Rc<RefCell<ProviderFilter>>,
     ) -> Self {
         let cfg = config.borrow();
@@ -140,7 +143,7 @@ impl MainWindow {
         hints_box.add_css_class("owlry-hints");
 
         let hints_label = Label::builder()
-            .label("Tab: cycle mode  ↑↓: navigate  Enter: launch  Esc: close  :app :cmd :uuctl")
+            .label("Tab: cycle mode  ↑↓: navigate  Enter: launch  Esc: close  = calc  :app :cmd :uuctl")
             .halign(gtk4::Align::Center)
             .hexpand(true)
             .build();
@@ -163,6 +166,7 @@ impl MainWindow {
             scrolled,
             config,
             providers,
+            frecency,
             current_results: Rc::new(RefCell::new(Vec::new())),
             filter,
             mode_label,
@@ -202,6 +206,7 @@ impl MainWindow {
             button.add_css_class("owlry-filter-button");
             let css_class = match provider_type {
                 ProviderType::Application => "owlry-filter-app",
+                ProviderType::Calculator => "owlry-filter-calc",
                 ProviderType::Command => "owlry-filter-cmd",
                 ProviderType::Uuctl => "owlry-filter-uuctl",
                 ProviderType::Dmenu => "owlry-filter-dmenu",
@@ -221,6 +226,7 @@ impl MainWindow {
             .iter()
             .map(|p| match p {
                 ProviderType::Application => "applications",
+                ProviderType::Calculator => "calculator",
                 ProviderType::Command => "commands",
                 ProviderType::Uuctl => "uuctl units",
                 ProviderType::Dmenu => "options",
@@ -328,7 +334,7 @@ impl MainWindow {
 
         // Restore UI
         mode_label.set_label(filter.borrow().mode_display_name());
-        hints_label.set_label("Tab: cycle mode  ↑↓: navigate  Enter: launch  Esc: close  :app :cmd :uuctl");
+        hints_label.set_label("Tab: cycle mode  ↑↓: navigate  Enter: launch  Esc: close  = calc  :app :cmd :uuctl");
         search_entry.set_placeholder_text(Some(&Self::build_placeholder(&filter.borrow())));
         search_entry.set_text(&saved_search);
 
@@ -341,6 +347,7 @@ impl MainWindow {
         let providers = self.providers.clone();
         let results_list = self.results_list.clone();
         let config = self.config.clone();
+        let frecency = self.frecency.clone();
         let current_results = self.current_results.clone();
         let filter = self.filter.clone();
         let mode_label = self.mode_label.clone();
@@ -401,6 +408,7 @@ impl MainWindow {
             if parsed.prefix.is_some() {
                 let prefix_name = match parsed.prefix.unwrap() {
                     ProviderType::Application => "applications",
+                    ProviderType::Calculator => "calculator",
                     ProviderType::Command => "commands",
                     ProviderType::Uuctl => "uuctl units",
                     ProviderType::Dmenu => "options",
@@ -409,13 +417,27 @@ impl MainWindow {
                     .set_placeholder_text(Some(&format!("Search {}...", prefix_name)));
             }
 
-            let max_results = config.borrow().general.max_results;
-            let results: Vec<LaunchItem> = providers
-                .borrow()
-                .search_filtered(&parsed.query, max_results, &filter.borrow())
-                .into_iter()
-                .map(|(item, _)| item)
-                .collect();
+            let cfg = config.borrow();
+            let max_results = cfg.general.max_results;
+            let frecency_weight = cfg.providers.frecency_weight;
+            let use_frecency = cfg.providers.frecency;
+            drop(cfg);
+
+            let results: Vec<LaunchItem> = if use_frecency {
+                providers
+                    .borrow_mut()
+                    .search_with_frecency(&parsed.query, max_results, &filter.borrow(), &frecency.borrow(), frecency_weight)
+                    .into_iter()
+                    .map(|(item, _)| item)
+                    .collect()
+            } else {
+                providers
+                    .borrow()
+                    .search_filtered(&parsed.query, max_results, &filter.borrow())
+                    .into_iter()
+                    .map(|(item, _)| item)
+                    .collect()
+            };
 
             while let Some(child) = results_list.first_child() {
                 results_list.remove(&child);
@@ -437,6 +459,7 @@ impl MainWindow {
         let results_list_for_activate = self.results_list.clone();
         let current_results_for_activate = self.current_results.clone();
         let config_for_activate = self.config.clone();
+        let frecency_for_activate = self.frecency.clone();
         let window_for_activate = self.window.clone();
         let submenu_state_for_activate = self.submenu_state.clone();
         let mode_label_for_activate = self.mode_label.clone();
@@ -470,7 +493,7 @@ impl MainWindow {
                         );
                     } else {
                         // Execute the command
-                        Self::launch_item(item, &config_for_activate.borrow());
+                        Self::launch_item(item, &config_for_activate.borrow(), &frecency_for_activate);
                         window_for_activate.close();
                     }
                 }
@@ -647,6 +670,7 @@ impl MainWindow {
         // Double-click to launch
         let current_results = self.current_results.clone();
         let config = self.config.clone();
+        let frecency = self.frecency.clone();
         let window = self.window.clone();
         let submenu_state = self.submenu_state.clone();
         let results_list_for_click = self.results_list.clone();
@@ -675,7 +699,7 @@ impl MainWindow {
                         is_active,
                     );
                 } else {
-                    Self::launch_item(item, &config.borrow());
+                    Self::launch_item(item, &config.borrow(), &frecency);
                     window.close();
                 }
             }
@@ -743,14 +767,27 @@ impl MainWindow {
     }
 
     fn update_results(&self, query: &str) {
-        let max_results = self.config.borrow().general.max_results;
-        let results: Vec<LaunchItem> = self
-            .providers
-            .borrow()
-            .search_filtered(query, max_results, &self.filter.borrow())
-            .into_iter()
-            .map(|(item, _)| item)
-            .collect();
+        let cfg = self.config.borrow();
+        let max_results = cfg.general.max_results;
+        let frecency_weight = cfg.providers.frecency_weight;
+        let use_frecency = cfg.providers.frecency;
+        drop(cfg);
+
+        let results: Vec<LaunchItem> = if use_frecency {
+            self.providers
+                .borrow_mut()
+                .search_with_frecency(query, max_results, &self.filter.borrow(), &self.frecency.borrow(), frecency_weight)
+                .into_iter()
+                .map(|(item, _)| item)
+                .collect()
+        } else {
+            self.providers
+                .borrow()
+                .search_filtered(query, max_results, &self.filter.borrow())
+                .into_iter()
+                .map(|(item, _)| item)
+                .collect()
+        };
 
         while let Some(child) = self.results_list.first_child() {
             self.results_list.remove(&child);
@@ -768,7 +805,12 @@ impl MainWindow {
         *self.current_results.borrow_mut() = results;
     }
 
-    fn launch_item(item: &LaunchItem, config: &Config) {
+    fn launch_item(item: &LaunchItem, config: &Config, frecency: &Rc<RefCell<FrecencyStore>>) {
+        // Record this launch for frecency tracking
+        if config.providers.frecency {
+            frecency.borrow_mut().record_launch(&item.id);
+        }
+
         info!("Launching: {} ({})", item.name, item.command);
 
         let cmd = if item.terminal {
diff --git a/src/ui/result_row.rs b/src/ui/result_row.rs
index 11052c3..52787c5 100644
--- a/src/ui/result_row.rs
+++ b/src/ui/result_row.rs
@@ -32,6 +32,7 @@ impl ResultRow {
             // Default icon based on provider type
             let default_icon = match item.provider {
                 crate::providers::ProviderType::Application => "application-x-executable",
+                crate::providers::ProviderType::Calculator => "accessories-calculator",
                 crate::providers::ProviderType::Command => "utilities-terminal",
                 crate::providers::ProviderType::Dmenu => "view-list-symbolic",
                 crate::providers::ProviderType::Uuctl => "system-run",