ChessDNA

ChessDNA's premise is that a single rating hides where a player is actually losing points, so it replaces one number with eight: tactics, endgame, calculation, defense, positional play, openings, time management, and resilience. Games import from Chess.com, Lichess, or a PGN file, and the radar that comes back is a genuinely more actionable diagnosis than a per-game accuracy score - it says which department is underperforming relative to the rest, which is the question a player at 1200-1800 usually cannot answer honestly about themselves.

The more interesting half is the pattern mining. Rather than reviewing one game and flagging one blunder, it looks across the whole history for repeats - the piece hung in time trouble across forty games, the same structure misplayed every time it appears - and converts the most expensive of those into replayable drills with AI explanations. Diagnosis plus reps in the same product is the right shape; most tools in this category stop at the diagnosis. The free tier is unusually generous for testing that claim: the full skill radar, the top three weakness patterns, three challenges a day, and the last fifty games, with no account required to start.

The caveats are competition and maturity. The full sixteen mistake patterns and the AI coach sit behind Pro at $5.99 a month or $49.99 a year, and at that price the comparison is Aimchess and Chess.com Insights, both of which cover the basics of cross-game weakness detection already - a player with Chess.com Diamond is partly paying twice. It is also a young product, with roughly 35,000 games analyzed platform-wide at review time, so the benchmarks it compares against are drawn from a small pool. The 90-day pass at $12.99 with no auto-renew is the sensible way in: three months is long enough to find the recurring leak and drill it, which is the entire value here, and the free radar is enough to decide whether the diagnosis rings true before paying anything.