my·blunders turns the games you actually played — on Lichess or Chess.com — into training built around your own mistakes. It pulls your recent games, finds the moves where your position really slipped, and asks you to find what you should have played instead, so you practise the positions you get wrong rather than generic puzzles someone else picked. Around that core sit an opening clinic, a coordinate trainer, and a play-against-the-engine mode.
Enter your Lichess or Chess.com username — we fetch your recent public games. No password, no sign-in.
Stockfish reviews each move to find the blunders. It runs right on your own device — in your browser on the web, and in the app on iOS — so your games are never analysed on someone else's server.
One puzzle per mistake, sorted by severity, with your progress tracked across sessions.
Public games only. You give a username, not a password. my·blunders only reads games you've already made public on Lichess or Chess.com — it never signs in as you.
We don't keep your games. On the web they're fetched through a thin relay (browsers can't call Lichess and Chess.com directly) and handed straight back to you; the iOS app talks to Lichess and Chess.com directly, with no server of ours in between. Either way nothing is stored on our side, and Stockfish runs on your own device.
Your progress stays with you. Imported games, puzzles and results are saved only on your device. Clearing your browser data — or the in-app “Clear all” — wipes them for good.
No accounts, no tracking. Nothing to sign up for, no ads, and no analytics following you around. What you train on is yours.
Analysis is powered by the Stockfish chess engine, compiled to WebAssembly and licensed under the GNU GPL v3. The iOS app includes an unmodified copy of this engine.
Source offer. In accordance with the GPL, the complete corresponding source for the bundled engine is available from the official Stockfish repository at github.com/official-stockfish/Stockfish, and the WebAssembly build we ship (with its full license text) from the Stockfish.js / lila-stockfish-web project. This app's own source is at github.com/samiabdulnour/my-blunders.