Cadence - LeetCode Attempt Stopwatch

Stamps [ Time taken: ... ] into every LeetCode submission's notes, wrong attempts included. Local-only, no servers, no data.

Cadence stamps the real time you spent into the notes of every LeetCode submission, including the wrong attempts, not just the accepted one. LeetCode's built-in timer only records time on accepted submissions, so the attempts that actually taught you something leave no trace. Cadence closes that gap: it starts a clock when you begin a problem, watches your own submissions on the page, and writes a "[ Time taken: MM:SS ]" line into the submission note automatically, every time you submit. Why you might want it: - Honest timing. Every attempt is recorded, including the wrong ones, so your notes reflect the real effort a problem took. - Zero setup. Install it and it just works on leetcode.com problem pages. No account, no sign-in, no configuration. - Private by design. Everything runs locally in your browser. No servers, no tracking, no analytics, no data collection. It asks for no permissions beyond running on LeetCode problem pages. How it works: 1. Auto-starts a clock when you begin coding a problem. 2. Watches your own submissions on the page. 3. Stamps the real time into the submission note, even for wrong answers. Cadence does one thing and does it well: accurate, automatic timing of your LeetCode practice, written where you already keep your notes.