by chess lovers, for chess lovers
Memberships
Train from your own games and try an AI explanation. Choose Basic for ongoing imports and more explanations, or Premium for deeper analysis and more connected accounts.
£0
1 AI explanation request per calendar month.
5 AI requests
Per billing period.
20 AI requests
Per billing period.
Analysis budget per position: Free Quick 100,000 nodes, Basic 1 million, Premium 10 million. Bullet uses Quick on every plan.
All games start with Quick analysis. Basic and Premium then deepen non-bullet games. Previously analyzed positions can reuse deeper results.
These budgets apply to game analysis. Puzzle solution checks and AI explanation continuations use separate searches; they are not a single budget for the whole game.
| Plan | iOS | Android |
|---|---|---|
| Basic | £3.99 | £4.09 |
| Premium | £6.99 | £8.49 |
These are UK prices. Your store region determines your local price, shown in the app before purchase. Basic and Premium renew automatically every month until cancelled; manage or cancel your subscription in your Apple or Google subscription settings.
Free is available forever, with automatic imports, Quick analysis and Game Tactics. Keep the chess account connected at sign-up. Adding or changing accounts requires Basic or Premium. 1 AI explanation per calendar month.
Free imports and analyses pause after 14 days of inactivity. When you return, we import the last 7 days. Saved games remain available. Paid plans continue without this pause.
Solve a game puzzle, then choose Explain for an explanation in your chosen language and playable continuations. Requests may take time to prepare. See a real example.
Free includes 1 AI explanation per calendar month. Basic includes 5 and Premium includes 20 per paid billing period. The Free allowance resets at the start of each calendar month in UTC; paid allowances renew with each paid billing period.
One credit is reserved while an explanation is being prepared and spent when it is ready. If preparation fails, the credit is released. Reopening an explanation you have already unlocked does not use another credit.
Get the iOS app Get the Android app
Already subscribed? Use Restore purchases under Membership & billing with the original store account and the same Blunderzone account. Web purchases are not available.
You can buy packs of 20 or 100 AI explanations separately, including with a Free account. No paid membership is required.
Purchased explanations do not expire. Your included allowance is used first, then your purchased packs.