Blundr

Your pocket chess coach just leveled up: learn the basics, friend Duels, endgame trainer, opening drills, and puzzles built from the mistakes in your own games and more.

Blundr is the chess training app built around YOUR weaknesses.

Play, learn, and improve with an AI coach that watches every move and tells you what you missed — grounded in real Stockfish analysis, not vibes.

WHAT'S INSIDE

• Play vs AI bots tuned from beginner-friendly (≈400 ELO) all the way up to grandmaster strength. • Ranked play against real opponents with ELO-based matchmaking after a 5-game calibration window. • Friends — search by username, send game challenges, see who's online. • In-game chat (consent-gated, with one-tap reporting). • Tactics — hundreds of curated puzzles by theme and difficulty, with retry support. • Practice drills — middlegame plans, endgame technique, opening continuations. Free for everyone. • Opening explorer — full move-by-move PGN replay for the most-played lines. • Post-game AI review — engine analysis, blunder detection, and an annotated game story (3 free per month).

BLUNDR PRO

For serious improvers, Pro unlocks: • Unlimited AI Coach chat with grounded game context. • Unlimited post-game AI reviews and engine analysis. • Live coaching after every practice drill and opening line — your AI coach narrates every move you make against the engine. • Climb — a personalised training roadmap that targets your weaknesses with daily tactics, opening drills, and ladder game goals. • Date Mode — discover compatible chess players, send invitations, play move-by-move date games.

Pro is purchased on the web at blundr.co/pricing and powers your account across both web and iOS. Cancel any time.

WHY BLUNDR

Most chess apps drown you in courses. Blundr does the opposite — it watches you play, finds the patterns where you lose ELO, and feeds you exactly the position-shapes you need to drill. The AI coach is grounded in your actual games, not a generic curriculum.

GROWN-UP MODERATION

Chat is opt-in and consent-gated. Every chat surface has a Report button that goes straight to a human moderation queue. Repeat offenders get muted or removed.

QUESTIONS / FEEDBACK

We read every email at support@blundr.co. Pull-to-refresh on the dashboard is the fastest way to recover from a flaky connection.

Terms of Use (EULA): https://www.blundr.co/terms Privacy Policy: https://www.blundr.co/privacy

Subscriptions:

• Blundr Pro Monthly — auto-renewing monthly subscription
• Blundr Pro Annual — auto-renewing annual subscription

Payment will be charged to your Apple Account at confirmation of purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. Subscriptions may be managed and auto-renewal turned off in your Account Settings after purchase. Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription.

— Built for serious improvers.