diff --git a/Cargo.toml b/Cargo.toml
index a407e45..c40c3e9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,8 @@ anyhow = "1.0.86"
 ratatui = "0.27.0"
 regex = "1.10.5"
 shellexpand = "3.1.0"
+serde = { version = "1.0", features = ["derive", "rc"] }
+serde_json = "1.0"
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3", features = ["winuser", "processthreadsapi"] }
diff --git a/src/constants.rs b/src/constants.rs
index 0b53098..3791d25 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -12,6 +12,7 @@ pub const SESSION_IN_PROGRESS: &str = "Session In-Progress";
 pub const SESSION_PAUSED: &str = "Session is paused. Unpause with 'p'.";
 pub const SESSION_STATS_TITLE: &str = "Session Stats";
 pub const STATUS_FILE: &str = "~/.antidrift_status";
+pub const HISTORY_FILE: &str = "~/.antidrift_history.jsonl";
 pub const STATUS_TITLE: &str = "Status";
 pub const STATUS_CONFIGURE: &str = "🔄 antidrift configure session";
 pub const STATUS_PAUSED: &str = "⏸ antidrift paused";
diff --git a/src/main.rs b/src/main.rs
index e17b515..2b08698 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,9 +1,10 @@
 use anyhow::Result;
+use serde::{Serialize, Serializer};
 use shellexpand;
 use std::collections::HashMap;
 use std::io::{stdout, Write};
 use std::rc::Rc;
-use std::time::{Duration, Instant};
+use std::time::{Duration, Instant}; // <--- Add this
 mod constants;
 mod window;
 
@@ -31,8 +32,17 @@ enum State {
     ShouldQuit,
 }
 
+fn serialize_duration<S>(duration: &Duration, serializer: S) -> Result<S::Ok, S::Error>
+where
+    S: Serializer,
+{
+    serializer.serialize_u64(duration.as_secs())
+}
+
+#[derive(Serialize)]
 struct SessionResult {
     intention: String,
+    #[serde(serialize_with = "serialize_duration")]
     duration: Duration,
     session_ratings: Vec<SessionRating>,
     rating: u8,
@@ -67,7 +77,7 @@ impl SessionResult {
     }
 }
 
-#[derive(Clone)]
+#[derive(Clone, Serialize)]
 struct SessionRating {
     window_title: Rc<String>,
     duration: Duration,
@@ -91,6 +101,24 @@ struct App {
     last_tick_1s: Instant,
 }
 
+fn save_session(session: &SessionResult) {
+    let path = shellexpand::tilde(constants::HISTORY_FILE).to_string();
+
+    // 1. Open file in append mode, create if missing
+    let file = std::fs::OpenOptions::new()
+        .create(true)
+        .append(true)
+        .open(path);
+
+    if let Ok(mut f) = file {
+        // 2. Serialize to JSON
+        if let Ok(json) = serde_json::to_string(session) {
+            // 3. Write newline appended
+            let _ = writeln!(f, "{}", json);
+        }
+    }
+}
+
 impl App {
     fn new() -> Self {
         let window_title = window::get_title_clean();
@@ -217,7 +245,7 @@ impl App {
         Duration::from_millis(50).saturating_sub(self.last_tick_50ms.elapsed())
     }
 
-    fn get_session_results(&self) -> Vec<Line> {
+    fn get_session_results(&self) -> Vec<Line<'_>> {
         self.session_results
             .iter()
             .map(|r| {
@@ -233,7 +261,7 @@ impl App {
             .collect()
     }
 
-    fn get_session_stats(&self) -> Vec<Line> {
+    fn get_session_stats(&self) -> Vec<Line<'_>> {
         let mut zero_encountered = if self.state != State::End {
             true
         } else {
@@ -386,6 +414,7 @@ fn handle_events(app: &mut App) -> Result<()> {
                     rating_f64: 0.0,
                 };
                 session_result.rate();
+                save_session(&session_result);
                 app.session_results.push(session_result);
             }
         }