Learn beaucoup openings,
one beau coup at a time.
The free and open-source chess opening trainer. Build your repertoire, drill it with spaced repetition, and never blank out on move 6 again.
Android & Linux · GPL-3.0 · No ads, no move limit
Everything a repertoire needs
Repertoire builder
Build opening repertoires on an interactive board. Transpositions converge naturally — your repertoire is a graph, not a flat tree.
Spaced repetition (FSRS)
Drill your lines with the state-of-the-art FSRS scheduler. Daily new-card budget, retention target, due forecast — you stay in control.
Stockfish built in
Every position analysed locally, every candidate move graded (?! ? ??) against the engine — spot the critical replies at a glance.
Opening popularity
Lichess and Masters statistics for every position — win rates, average Elo — without needing a Lichess account.
Sync across devices
One free account: repertoires and training progress follow you from phone to desktop, automatically.
Your data stays yours
PGN import and export, smart re-import that never loses your training history. No lock-in, ever.
Free as in freedom
Beau Coup is the libre alternative to paywalled opening trainers: no subscription needed to build and train unlimited repertoires. The whole app is GPL-3.0 — built on the same open-source chess stack as Lichess.
Source code on GitHub