Free: $0. Pro: $9.99/month, $69/year, or $149 lifetime (early-bird for first 100 buyers, then $249). Pro covers up to 100 Coach-explained games and 50 scoresheet photos per month.
Not given
Key features
Accuracy scoring based on winning chances
Move labels: inaccuracy, mistake, blunder
No account required for free review
Import games from Lichess or Chess.com
Coach written explanations in plain language
Scoresheet photo to PGN conversion
Suspected mistakes checked twice at greater depth
DAILY 7 mode with seven prompts per day
ENDLESS mode with unlimited plays and hearts system
No account or installation required
Mobile phone compatible
Saved progress across sessions
Score based on answer popularity
25-second timer per prompt
Answer feedback controls
What makes it different
Honest labeling: mistakes rechecked deeper before labeling
No uploads for free review: analysis runs locally in your browser
Free review never requires account or has daily limits
One-click review for returning users with remembered username
Opposite of Krillion where common answers score highest
Entirely free to play with no ads or payments
Your balloon altitude climbs with each correct answer