Chessreps is a dedicated opening trainer: hundreds of ready-made courses and a strong spaced-repetition system for getting lines into long-term memory. ChessLogix asks the question that comes before that one — which of your openings is actually costing you results, and at which move does it start? Then it turns the answer into repertoire lines, drills and sparring, and checks whether that opening scores better afterward.
Free Runs in your browser · Chess.com and Lichess
Repetition is a solution, and it is a good one. It assumes you already know which repertoire you want, which variations matter to you, and where your existing preparation is failing. For a lot of players those assumptions are the actual problem: they drill a line their opponents never play, while the opening quietly losing them rating goes untouched because nothing has ever pointed at it. ChessLogix is built to point at it first — from your own games — and only then to turn the chosen lines into repetition.
Drilling is not the hard part of opening study. Deciding what to drill is. A repertoire you rehearse for a month is a month of study time committed before anyone has checked whether that opening is where your rating is leaking.
And when an opening does go badly, the name of the opening is rarely the answer. “I score 41% in the Italian” is not actionable. It is only useful once you know that the 41% is really one move order — that your results hold until move nine and fall apart at a specific branch, in one color, against one common reply.
That is the level ChessLogix works at. It takes the games you already played, replays their openings with Stockfish in your browser, and reports where you actually stood at the checkpoint you chose, what you scored from there, and which of your own moves cost the most getting there.
The check runs on the handles, colors and time controls you select, so a number can always be traced back to a set of games. The finding is a count, not an opinion: how many games reached the checkpoint worse, and what you scored from each side of that line.
Opening training is only one row of this table for ChessLogix and it is nearly all of it for Chessreps, which is exactly the difference worth understanding before you pick one.
| Capability | ChessLogix | Chessreps |
|---|---|---|
| Unlimited Stockfish review | Yes, running in your own browser, with no per-game limit and no card. | Not the product. Chessreps trains authored course lines rather than reviewing your games. |
| Analysis board without an account | The board, the engine and the opening databases open with no account at all. | Chessreps publishes an analysis board; the opening trainer itself sits behind a seven-day trial and then a subscription. |
| Identifies weak openings from your games | Opening Check replays the openings of the games you actually played and scores them. | No game-history diagnosis. You choose the course. |
| Finds the exact failing branch | Follows the opening past its name to the move order where your score separates. | Not offered. |
| Opponent-rating and time-control filters | Human results filtered to your rating band and time control, shown beside your own record. | Course lines are authored rather than filtered to your rating band. |
| Practical result and engine evaluation, separately | A human score says how players at your level did with a clock running; an engine evaluation says what the position is worth. Both are shown, labeled, side by side and never merged. | Primarily authored course lines with their recommended continuations. |
| Opening course library | None. A personal repertoire assembled from the lines your own games reach. | More than 500 courses covering major opening systems for both colors, with new ones added regularly. |
| Spaced repetition | Saved repertoire lines come back for recall as part of the daily session. | The core specialization, with Learn, Practice and Drill modes built around it. |
| Native mobile apps | Web only, on desktop and mobile browsers. | iOS and Android, with progress syncing across devices. |
| Sparring past the end of the line | Practice continues from the saved position instead of stopping where the memorized line does. | Primarily line training against the course. |
| Tactics tied to your own play | Puzzles rebuilt from the positions where your evaluation actually turned, plus unfamiliar positions asking for the same decision. | Puzzles drawn from real games in which the opening you are learning was played. |
| Tracks opening improvement in later games | Re-run the check on newer games and compare the same branch before and after. | Tracks course mastery and recall rather than results in your games. |
| Price | The learning platform is free with no time limit. Two AI features are an optional $14.99 monthly membership. | Seven-day free trial, then $34.99 a year. |
Chessreps advertises more than 500 courses, several repetition modes, iOS and Android apps, and a $34.99 annual subscription after its seven-day trial. That is a far larger prebuilt opening library than ChessLogix has, and mobile repetition is a real advantage for anyone who studies on a phone.
The repetition comes last here, not first. Everything before it exists so that the lines you rehearse are the ones your own games say are worth the time.
Pick the handles, colors, time controls and how deep into the game to look. Stockfish replays each matching opening in your browser and reports where you stood at that checkpoint.
A weak opening is usually one weak branch. The report walks the move orders until it reaches the point where your score separates from the rest of your repertoire.
Your own record sits beside human results for your rating band and time control, with the engine evaluation next to both — so “this line is bad” and “I play this line badly” stop being the same sentence.
The move that scores best for humans at your level and the move the engine prefers are shown separately and never merged. Sometimes they are the same move. Often they are not.
Chosen lines become a personal repertoire with the reason each was picked. Recall brings them back in the daily session, and practice continues from the end of the line rather than stopping there.
Same branch, newer games. Whether the opening now scores better is a measurement you can take, not a feeling you have to trust.
Human results at your rating band answer “how hard is this to play with a clock running”. The engine answers “is it sound”. Confusing the two is how players end up drilling an objectively fine line that they lose with anyway.
None of these are criticisms of spaced repetition, which works. They are the questions repetition is not designed to answer, and each one decides where study time should go.
Perfect recall of a line you rarely reach changes nothing. The first useful number is how many of your games were already worse by the checkpoint, and what you scored from there.
Courses are organized by variation. Your results are not. The branch where your score falls may sit three moves before the move the course treats as the critical one.
Human results filtered to your rating band and time control say which replies you will actually meet, which is often not the main line a course spends its longest chapter on.
Course mastery measures memorization. Running the same opening check over newer games measures whether the opening now performs better in real games, which is the thing you were buying.
Chessreps makes opening training deliberately casual — witty blurbs, colorful modes, time trials and leaderboards — and that is a real product decision, not a flaw. Study you skip has an effectiveness of zero, and making repetition fun is a legitimate way to fix that.
ChessLogix keeps a motivation layer too: a daily session, a season with points, timed pattern runs, and drills that come back until they stick. It deliberately does not keep a consecutive-day streak — a counter that can only ever be lost is one of the most reliable ways to make someone stop opening a training app — so the record counts the weeks you actually trained instead. The difference from a gamified trainer is what sits underneath: every score leads back to a game, a position, a decision or a measurable skill, and you can always open the underlying games, statistics and engine evidence.
The motivation layer makes training easier to continue. It does not replace the chess analysis, and on this site it is never allowed to stand in for it.
The check runs on your own machine, it is free, and you can stop it at any point and keep what it has already found. Twenty minutes of it will tell you whether an opening subscription is the right purchase at all.
Check My Opening Performance FreeChessreps helps you remember an opening. ChessLogix helps you find out whether that opening is helping or hurting your chess — and these are not the same purchase.
Everything said here about another product comes from that product's own public documentation, read on the date above — not from hands-on use of its paid tiers. Features change. If something here is out of date, tell us and we will fix it.
Pick Chessreps if the job is memorizing opening lines. It advertises more than 500 courses, a spaced-repetition engine built for exactly this, Learn, Practice, Drill, Time Trial and Puzzle modes, native iOS and Android apps with syncing progress, and $34.99 a year after a seven-day trial. ChessLogix has no course catalog and no mobile app; for pure repertoire recall, Chessreps is the better buy and this page will not pretend otherwise.
Yes, but it is one stage rather than the product. Lines you save to your repertoire come back for recall inside the daily training session, alongside puzzles from your own games. What ChessLogix does not have is a catalog of prebuilt courses to drill — the lines in your repertoire are ones you chose after seeing how the branch scores in your own games. If prebuilt spaced repetition at scale is what you want, Chessreps specializes in it.
You pick the handles, colors, time controls and how far into the game to look. Stockfish replays the opening of every matching game in your browser and records where you stood at that checkpoint. The report then compares what you scored from the games that reached it worse against the rest, and names the individual moves that cost the most. From there you can open any position on the board and search it deeper.
The analysis board, the browser engine and the opening databases open with no account at all. The opening check runs over your own imported games, so it needs a free account to have games to read — there is no card and no time limit. AI Move Explanation and Meta-Coach are the only paid features, as an optional $14.99 monthly membership.
Yes. Practice continues from the saved position rather than stopping where a memorized line does, which is the failure mode most opening study has: you know eleven moves, the opponent deviates on move seven, and the preparation stops being worth anything. Human reply frequencies for your rating band are also shown, so you can see which deviations you will actually meet.
That is a reasonable setup. Use ChessLogix to find which opening and which branch is costing you results, then use a Chessreps course if you decide the fix is a full repertoire you need burned into memory. What is worth avoiding is the reverse order — a year of drilling chosen by browsing a catalog, with nothing ever checking whether that opening was the leak.
Pick your handles, your time controls and how far into the game to look. Stockfish replays the opening of every game that matches, in your browser, and reports where you stood at the checkpoint, how those games finished, and which of your own moves cost the most getting there.
