What is OpponentBook?
Your private opponent book. Log opponents, matches, training, and observations — and let the app surface patterns over time. Think of it as a notebook that does math.
Getting started
What OpponentBook is and how to start
I just signed up — what do I do first?
Add the next opponent you expect to face. You can do it in 30 seconds: name, club, and one observation. Logging your first match takes about a minute. Everything else can wait.
Do I have to connect storage right away?
No. Local-only mode is fully usable on this device. You'll see a banner on Today reminding you to connect when you're ready — that's when cross-device sync and backup turn on.
The questions we hear most, answered without hedging. If you don't find what you need, email help@opponentbook.app.
Ready to try it?
The whole journal is free, forever, on your own storage.
Sign up free