Beat your blunders.
Find your match.
Blundr studies every game you play, finds the mistakes holding you back, and builds a personalized training plan around your chess. Then — when you're warmed up — climb the ranked ladder, challenge a friend, or take a chance on Date Mode and play someone new.
Free to start · Pro tier coming soon · Web + iOS · Stockfish + GPT inside
Top weakness
You hang pieces under pressure (–2.4 swing avg)
Tactics rating
1,432 ▲ 18 this week
Coach says
Slow your openings down — you make 3 of every 5 blunders in the first 12 moves.
A whole training plan, generated around you
Personalized coaching
The AI builds a living model of your style — what you do well, what trips you up — and adapts every drill to that profile.
Tactics tuned to your gaps
Forks, pins, mating nets, sacrifices. We pick the puzzle themes you fail at most. Your weakest squares become your sharpest.
Opening explorer + repertoire
Build a real repertoire with spaced-repetition drills. The AI plays your opponent's nasty sidelines until you're ready.
AI game review
Every game gets a conversational review. Not 'mistake on move 14' — instead, why it's a mistake and what idea you missed.
Progress that compounds
Track rating, accuracy, and confidence over time. See how your endgame coverage shifts after one focused week.
A coach with a voice
Pick your coach: patient mentor, witty quipster, GM-style purist, or one-line minimalist. The tone, your way.
How it works
- 1
Play
Bots tuned to your level, ranked matchmaking, friend challenges, or Date Mode — pick your vibe.
- 2
Analyze
Stockfish + AI review every position. Mistakes are tagged with structured habits.
- 3
Train
Personalized puzzles, opening drills, and lessons appear — weighted by your real weaknesses.
More than just the board
Climb a ladder, challenge a friend, or play someone you might actually want to meet. Pull-up the same chessboard for any of it.
Ranked ladder
First five games are provisional. After that, ELO moves with every win and loss — and matchmaking pairs you within ±30 of your rating so games stay close.
Friend challenges
Direct invite a friend, pick a time control, set it Rated or Casual. They get a notification, you both get a board. Chat opens once both sides agree.
Date Mode
Each move is gated on a question and an answer. Get to know someone over a real game — half flirt, half opening prep. Yes, it's a little weird. That's the point.
Stop reviewing the same lessons. Review yourself.
Sign up, play a few games, and watch your training plan materialize. Stick around for the ladder, your next blitz with a friend, or whatever happens in Date Mode.
Free to start. Pro features coming soon.