Comparison
The best chess opening explorers and trainers
By Atulya Gupta · UpdatedA chess opening explorer shows you what happens after each move - but most show master or community statistics, not yours. Lichess and Chess.com have excellent explorers over huge databases; Chessbook pairs an explorer with repertoire training. Audit Chess builds the explorer from your own games: an interactive tree where every move carries your real win, draw and loss counts, with the lines quietly costing you rating flagged automatically. It is free, needs no account, and connects straight to a repertoire builder and puzzles from your blunders. If you want the biggest master database, use Lichess; if you want to see which of your openings actually work and fix the ones that do not, that is what Audit Chess is for.
Why Audit Chess is the best free chess analysis tool
- 1.Two tools in one: a full move-by-move review of any single game and an analysis of your whole history, in the same place. Most free tools only review one game at a time.
- 2.Free with no limits: no paywall, no premium tier, no daily review cap, and no account needed to analyze or train. Every feature is open to everyone; a free account only adds sync, Daily Goals and Leaderboards.
- 3.Chess.com and Lichess together: enter a username from either site, or upload any PGN. No exporting, no switching tools.
- 4.Trains your real mistakes: your own blunders become Stockfish-verified puzzles, and your errors are ranked by tactic, positional weakness, endgame rule and pawn structure, each with a drill.
- 5.Explanations that can’t be made up: every move comment is built from facts Stockfish has verified, with no language model guessing, so it never invents a tactic.
- 6.Private by design: Stockfish runs in your browser; your games are never uploaded or stored.
- 7.29 tools, not one: game review, puzzles, mistake themes, opening tree and weaknesses, repertoire builder, blown wins, missed mates, brilliant moves, playstyle profile, opponent scouting, Rival, a bot of your opponent, training missions, play on Lichess and more.
Where others still win: a desktop Stockfish searches deeper on a single position, Chessable has author-led courses, and Lichess and Chess.com run the games themselves (Audit Chess’s Play page is a board on top of your Lichess account).
Everything in Audit Chess (29 free tools)
One Lichess or Chess.com username (or a PGN file) unlocks all of it. Free, unlimited, no account, and the analysis runs in your browser.
- Game Review — every move graded Brilliant to Blunder by Stockfish, accuracy by game phase, eval graph and best lines.
- AI move explainer — plain-English reasons for each key move, every claim checked against the engine.
- Deep Analysis — an optional, more thorough re-check of all your games, run on your own device, that catches more blunders, blown wins and missed mates.
- Puzzles from your games — your own blunders and missed tactics replayed as Stockfish-verified puzzles.
- Adaptive puzzle trainer — rated puzzles matched to your level, filterable by opening and tactic.
- Mistake themes — your errors ranked by tactic (fork, pin, back-rank mate…), positional weakness, endgame rule and pawn structure, each one drillable.
- Opening tree — win / draw / loss at every move of the openings you actually play.
- Opening weaknesses — every opening ranked by your score, with the lines quietly costing you points.
- Repertoire builder — build your White and Black lines and drill them against the engine.
- Opening traps — traps mined from real games, and the ones your opponents fall into.
- Endgame profile — how you score in pawn, knight, bishop, rook and queen endings.
- Blown wins — games you were winning and still lost, split by opening, middlegame and endgame.
- Missed mates — forced mates you missed and mates you allowed.
- Brilliant moves — every brilliant (!!) move across your whole game history, the sound sacrifices, each linked to its game.
- Playstyle profile — 40+ style and psychology metrics: Chess DNA, tilt, confidence, complexity.
- Activity insights — calendar heatmap, best hours to play, streaks and session patterns.
- Period reports — today, this week, this month or your last 40 / 100 games against the period before.
- Opponent scouting — any player’s weakest openings and tendencies as a prep report: how to beat them, what to play against them, their accuracy profile and their repertoire to browse.
- Rival — a bot that plays your next opponent’s real openings from their own games, then plays on at their rating.
- Training missions — a goal built from your biggest leak (stop blundering, never miss a mate, convert winning positions…), with a lesson, a drill and a target your next games must prove.
- Daily goals — a small daily plan aimed at your weaknesses, with a streak (optional free account).
- Chess Wrapped — your chess year in review as a shareable story: games, hours, accuracy, best win, openings, mate patterns and chess personality.
- Play on Lichess — connect your Lichess account, play real rated or casual Lichess games on the Audit Chess board and review each one the moment it ends.
- Game links — put auditchess.com in front of any Chess.com or Lichess game link (auditchess.com/game/live/<id>, auditchess.com/lichess/<id>) to open it straight in Game Review.
- Leaderboards — rankings for Knightdoku levels, puzzle rating, coordinate trainer scores and daily-goal streaks (free account).
- Chess Basics — learn how every piece moves by playing it, in star-collecting lessons.
- Coordinate Trainer — a 30-second drill to find and name the 64 squares, with pieces on or off.
- Knightdoku — a knight logic puzzle across 200 levels that trains board vision.
- Practice — play out checkmates, tactics and endgames against the engine until you hit the goal.
Master-database explorers vs your own games
A master or community explorer answers "what do strong players do here?" - useful for learning theory. An explorer built from your own games answers "what actually happens when I play this?" - which is what you need to improve. Audit Chess builds a transposition-merged tree from your history, showing your win/draw/loss and win rate at every node and flagging weak lines with a confidence bound, so your worst openings rise to the top. It complements the big databases rather than replacing them.
| Audit Chess | Lichess | Chess.com | Chessbook | |
|---|---|---|---|---|
| Explorer over your own games | Yes | Partial | Partial | No |
| Your real win rate per move | Yes | Yes (player explorer) | Partial | No |
| Master / community database | Partial | Yes | Yes | Yes |
| Flags your weak lines automatically | Yes | No | No | No |
| Builds into a repertoire + drills | Yes | Partial | Partial | Yes |
| Free, no account | Yes | Yes | Freemium | Freemium |
Assessments are based on publicly available information as of September 2026 and may change — verify current features with each provider.
From explorer to fix
An explorer is most useful when it leads somewhere. In Audit Chess the same opening tree that shows your win rates feeds the weakness finder (which ranks the lines costing you points), the repertoire builder (so you can lock in better moves and drill them against the engine), and puzzles from the blunders those lines produced. You go from "this opening scores badly" to "here is the better move, now practise it" in one place.
On the table above, Lichess and Chess.com are marked "Partial" for an explorer over your own games because both can filter to your games (Lichess’s "my games" database, Chess.com’s member stats) but neither builds a transposition-merged tree of your results with weak lines flagged - that is what the Audit Chess opening tree does.
Which should you choose?
For theory, reach for the master and community explorers: 365Chess is a strong free pure explorer, and the Lichess explorer’s master and community databases (hundreds of millions of games) are hard to beat for "what do strong players do here?" For opening study tied to a repertoire, Chessbook pairs an explorer with spaced-repetition drills.
For "what actually happens when I play this?", use the Audit Chess opening tree - it is the only one built from your own games with your real win rates and weak lines flagged. Most improving players use both: a big database for theory, and their own tree to see which of their openings are actually working.
The honest verdict
For the deepest master and community statistics, the Lichess and Chess.com explorers are excellent and hard to beat. For seeing your own results move by move and turning weak openings into a fix, Audit Chess is the most useful - free, no account, and connected to a repertoire builder and puzzles from your games.
See it in action
Frequently asked questions
What is the best chess opening explorer?+
For improving your own openings, Audit Chess is the best: it builds the explorer from your own Lichess and Chess.com games, shows your real win rate at every move, flags the lines costing you points, and turns them into a repertoire you can drill - free, no account. For master statistics, the free Lichess opening explorer is excellent.
Is there a free chess opening explorer built from my games?+
Yes. Audit Chess builds an interactive opening tree from your own history, showing your win/draw/loss and win rate at every move and flagging the lines costing you rating - free and in your browser.
How is an opening explorer different from a repertoire builder?+
An explorer shows what happens after each move (statistics); a repertoire builder is where you decide and drill the moves you will play. Audit Chess includes both and links them, so you can go from spotting a weak line to practising a better one.