Reference
Every feature, in the order you use them
The homepage shows what the app is for. This page is the full list: what each tool does, which stage of the work it belongs to, and what it costs. It ends with an index of all 25 capabilities, 16 of them free.
- 01 Build or import
- 02 Refine close the gaps
- 03 Train from memory
- 04 Play and take the time back
what you got wrong comes back
01 Build
Build the repertoire
Play moves on the board and the repertoire tree grows with them. Nothing is locked: add variations and annotations, reorder moves, and cut what you no longer want.
- Repertoire visualisation
- See the whole tree at once instead of one move at a time. The line you are on stays highlighted, so you can tell where a branch leads before you commit to it.
- Separate repertoires for White and Black
- Choosing an opening and answering one are different jobs, so keep them apart. There is no limit on how many repertoires you create.
- Import what you already have
- Paste PGN text, open a PGN file, or bring in a Lichess study. Chess.com, ChessBase and other software export the same format.
- Export any time
- Every repertoire exports to PGN text or a PGN file. Your preparation is never locked to one app on one phone.
- Start from a ready-made repertoire
- Downloadable repertoires are editable templates, built from Lichess studies, videos and our own preparation.
- Transpositions handled for you
- 1. e4 e5 2. Nf3 Nc6 and 1. Nf3 Nc6 2. e4 e5 reach the same position. The app knows that, however you got there.
02 Refine
Refine it against real games
A repertoire is only as good as its coverage. Before you spend a month memorising it, find out what real opponents play, where your lines run out, and which branches are not worth keeping.
- Opening book
- Every move played from the position in front of you, with win, draw and loss figures and the number of games behind each one. Filter it to your own rating band, because what is common at 1200 and what is common at 2200 are different openings. How it works
- Stockfish on the board
- Run the engine while you build, so a line you invent is a line you have checked.
- Blind Spot Finder
- Scans the whole repertoire for likely opponent moves you have not prepared, most probable first. How it works
- Smart Trim
- The opposite job. It finds branches that almost never occur in real games, so you can stop studying them. How it works
03 Train
Train until you can recall it
Training shows a position and asks for the move. It works through one complete line at a time and varies the opponent's choices, so a session feels like a game rather than a stack of flashcards.
- Entire Repertoire
- Practise every position in order, from the first move to the end of each line.
- Single Variation
- Drill one line until it is solid, which is what a sharp variation actually needs.
- Smart Train
- Spaced repetition that shows a position just before you would have forgotten it. Right answers widen the gap, wrong ones shorten it. How it works
- Often Failed Positions
- Your training history remembers every miss, so the positions that keep catching you are one tap away.
- New Positions
- Rehearse only what you have just added, without walking through lines you already know.
- Training filters
- Layer restrictions on any mode: depth limits, move history filters, or main lines only for a large imported repertoire.
04 Play
Then go and use it
Preparation is not a study habit for its own sake. It changes what happens in the game: which positions you reach, how much clock you still have when the real work starts, and how often you are the one holding the surprise.
- Keep your clock
- Moves you decided at home cost you seconds instead of minutes. That time is still there when the position turns sharp.
- Traps only work once
- The Fried Liver, the Blackburne Shilling, the Légal Trap. Every one of them is dangerous exactly until you have the answer written down.
- Hold the surprise
- A sound sideline you know well beats a main line you half remember. Your opponent has to solve at the board what you solved at home.
- Reach familiar middlegames
- A repertoire steers you into the same structures again and again, and structures you have played before are structures you have plans in.
- Turn a loss into a line
- Lost to something you had never seen? Look it up, decide your answer, and add it that evening. The same opening never costs you twice.
Ready-made
Start from someone else's work
Editable templates, not locked courses. Download one and cut whatever does not suit you.
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1. d4 d5 2. c4 e6 3. Nc3 Nf6
Cambridge Springs Trap
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1. e4 c6
Caro-Kann Defense
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1. c4
English Opening
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1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4
Nakhmanson Gambit
Four of the repertoires in the app, as examples. The full list is searchable in the app and filterable by colour.
Also in the app
Works offline
Building and training need no connection. Repertoire downloads, the opening database, the Blind Spot Finder and account actions do.
Backup and restore
Premium backs repertoires up to your account as a restorable checkpoint, and brings them to a new device when you sign in.
Made yours
Colour scheme, board behaviour, movement sounds and other preferences are all adjustable.
Many languages
The interface and the downloadable repertoire annotations are translated for players around the world.
Index
Every capability, and what it costs
16 of 25 are free. No repertoire limit, no move limit.
| Feature | What it does | Plan |
|---|---|---|
| Custom repertoires | Unlimited, for White and for Black | Free |
| Moves and variations | No limit at any depth | Free |
| Repertoire visualisation | The whole tree on one screen | Free |
| Annotations | Notes and comments on any move | Free |
| Transposition handling | Same position, any move order | Free |
| PGN import | PGN text and PGN files | Free |
| Lichess study import | Straight from a study link | Free |
| PGN export | Text or file, any repertoire | Free |
| Downloadable repertoires | Editable ready-made templates | Free |
| Entire Repertoire training | Practise everything in order | Free |
| Single Variation training | Drill one line at a time | Free |
| Training filters | Depth, history and main lines only | Free |
| Opening book | Real games, filtered to your rating | Free |
| Stockfish | Engine analysis on the board | Free |
| Offline use | Building and training | Free |
| Appearance | Colours, sounds, board behaviour | Free |
| Smart Train | Spaced repetition scheduling | Premium |
| Often Failed Positions | Straight to your weak spots | Premium |
| New Positions | Only what you just added | Premium |
| Re-train failed positions | Fix misses right after a session | Premium |
| Blind Spot Finder | Replies you have not prepared | Premium |
| Smart Trim | Branches nobody plays | Premium |
| Unlimited downloads | Every ready-made repertoire | Premium |
| Cloud backup | Restore points on your account | Premium |
| Ad-free | No ads anywhere in the app | Premium |
The app shows the current price before you buy. See free and premium side by side.
Try it on your own openings
Free to start, with no repertoire or move limit.
No account needed no repertoire or move limit · premium optional