About this app
What Opening Trainer does
You have watched the videos and you know the moves — right up until you are actually at the board and your opening evaporates. Opening Trainer fixes that the way flashcards fixed vocabulary: it turns the lines you play into a spaced-repetition deck and quizzes you on the exact positions you keep missing. Build a repertoire for White or Black by simply playing the moves on an interactive board — the main line, the sidelines, and your opponent's replies. Name each line (‘Italian — main’, ‘Caro-Kann — Advance’) and Opening Trainer automatically creates a review card for every move you are responsible for. Then Drill mode shows you a position and asks you to play your move on the board. Get it right and the card schedules further into the future; miss it and it comes back today. An SM-2 style scheduler — the same algorithm behind serious language apps — keeps your weak spots in front of you and lets the moves you already know fade to the back. Everything is offline. There is no account, no server, and nothing is ever uploaded. Your repertoires and your entire review history live only on your device, so you can drill on a plane, on the subway, or anywhere with no signal. And there is no engine looking over your shoulder — Opening Trainer plays no games against you and makes no evaluation claims. It is a study tool, plainly and honestly, built to move your openings into long-term memory. • Build repertoires for White and Black on an interactive board • Save named lines with the opponent's replies included • Drill mode: play the correct move on the board, with instant right/wrong feedback • SM-2 spaced repetition surfaces the positions you keep missing • Today screen shows exactly how many positions are due • Repertoire tree merges your lines and flags weak nodes • Mistake heatmap of your shakiest positions • 100% offline — no account, no server, no engine, nothing uploaded Opening Trainer is a personal study tool for your own opening repertoire. It is not affiliated with any chess site and does not provide online play or engine analysis.
Features
Built to be useful, not noisy.
Line builder
Build repertoires move-by-move on an interactive board.
Spaced-repetition drills
The app quizzes the positions you miss, on schedule.
Repertoire tree
See your lines and weak nodes at a glance.
Why it exists
The problem
Chess players can't turn their own opening lines into a spaced-repetition deck they can drill offline — repertoire tools are weak and online-only.
What's different
How Opening Trainer stands out
A fully offline, account-free opening trainer that converts your own lines into SM-2 spaced-repetition drills on a real board, flagging the positions you keep missing.
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FAQ
Questions about Opening Trainer
How much does Opening Trainer cost?▾
Opening Trainer is free. All features are included from day one — no subscription, no in-app purchases, no paid tiers. Everything you see in this listing works the moment you install it.
Where does Opening Trainer store my data?▾
On your device. Opening Trainer is built privacy-first: no account is required, no analytics SDKs, no third-party trackers. Nothing is uploaded to a server we control — the app works without one.
What platforms does Opening Trainer support?▾
iOS, on iPhone and iPad. You can find the latest availability on this page.
How do I get support for Opening Trainer?▾
Use the Support link on this page, or email support@allthingsn.com. We answer every message and keep responses on the same thread.
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