Your storage
01We cannot read your notes.
Everything you write lives on your own Google Drive, Dropbox or iCloud — never on our servers. Not "we promise we won't look." There is nothing on our side to look at.
For individual-sport athletes
The journal you keep on every opponent — and on yourself.
You've faced her twice. What did you learn? OpponentBook is a private book of everyone you compete against — what worked, what didn't, what to remember next time. On your own cloud storage, in your own words.
- Free forever — the whole journal
- Your notes live on your storage, not our servers
- No streaks. No badges. No noise.
What makes it different
A notebook, not a platform.
No streaks
02Quiet by design.
No badges, no guilt, no push notifications begging you to come back. You write when there's something worth writing. The app's job is to remember it — and quietly surface patterns.
Your sport
03Drawn for your playing surface.
Drop pins on a real schematic of the piste, table, court, mat or ring. Sixteen sports, each with its own diagram, fields and vocabulary — not a generic notes app with sport skins.
The book
Everything a scouting book should hold. Free, forever.
The whole journal is the free tier — not a teaser. Unlimited opponents, matches, media and sync. Paid tiers add intelligence on top; they never ration the notebook.
01
Opponents
A living profile for everyone you face: structured fields, free-form observations, full match history.
02
Matches
Score, score by period, and the three questions that matter: what worked, what didn't, what to remember.
03
Pins on the surface
Tap the schematic where it happened — worked, didn't, danger, tendency. Watch patterns accumulate.
04
Photos & video
Unlimited, because it's stored on your cloud. Clip the exchange you never want to forget.
05
Events
Tournaments as first-class things — prep the field before, review the day after.
06
Training journal
Sessions, focus, effort. Your training log lives next to your opponent book, where it belongs.
07
Exports for your coach
One opponent, a full scouting brief, or the whole book — to PDF or Word, free at every scope.
08
Offline & synced
Works at the venue with no signal. Syncs across phone, tablet and laptop through your own storage.
The signature feature
Where does she score on you?
During or after a match, drop a pin on the schematic — the actual piste, table, court or mat. Each pin takes a short note. Over months, pins aggregate into heatmaps per opponent and across your whole book: where left-handers score on you, where your own attacks land, what changed since last season.
- Four pin kinds: worked, didn't work, danger, tendency
- Accurate schematics for all sixteen sports
- Heatmaps per opponent — and across every opponent you've logged
The honest feature
Does reviewing your notes actually help you win?
OpponentBook quietly notes when you've read up on an opponent before facing them — never what you wrote, just that you prepared. Then it shows you the one number most sports apps would never dare to: your record when you prepared, next to your record when you didn't.
No streaks to maintain, no score to gamify. Just an honest answer to whether the habit is working — because if it isn't, you deserve to know.
71%
when you reviewed first
48%
when you didn't
Illustration — your own numbers build over a season. Stored on your storage, off by a single switch, erasable any time.
Structural privacy
"We don't read your data" is a policy. "We can't" is architecture.
OpponentBook stores your journal on storage you already own — Google Drive, Dropbox or iCloud. Our servers hold your login, your subscription state, and an anonymous skeleton of IDs and dates. That's the whole list.
What Recsty AB cannot see
- Your observations about opponents
- Match reflections and scores
- Training entries
- Photos, video, voice memos
- Whether you reviewed before a match
What we do see
- Your email and login method
- Your subscription tier
- Anonymous IDs and dates, so your lists load fast
Want your storage provider out of the loop too? Optional end-to-end encryption seals your notes before they leave your device.
Sixteen sports at launch
Built by a fencer. Drawn for every duel.
OpponentBook was started by a competitive fencer who kept losing to the same opponents in the same ways — and decided to start writing things down. Every sport gets its own schematic, structured fields and tag vocabulary.
Fencing
Foil · épée · sabre
Table tennis
Singles or doubles
Badminton
Singles court
Tennis
Singles court
Padel
Doubles · walled court
Squash
Singles court
Judo
Tachi-waza + ne-waza
BJJ
Position-driven
Wrestling
Folkstyle · freestyle · Greco-Roman
Kendo
Shiai-jō · sanbon-shōbu
Boxing
Ring · 3–12 rounds
MMA
Cage · standing + ground
Taekwondo
WT & ITF sparring
Karate
Shōbu ippon · WKF kumite
Kyokushin Karate
Knockdown karate
Ju-jitsu
JJIF fighting system
Multi-sport athletes: switch sports freely, keep separate books, on every tier — including Free.
When you want more than memory
AI that reads your book — only when you ask.
Paid tiers turn your accumulated notes into opponent summaries, pre-competition briefs and pattern analysis. Every AI feature runs on an explicit tap; nothing scans in the background, and a user who never presses the button never sends a byte to AI.
One-tap opponent summaries
Your five matches of scattered notes on an opponent, distilled to 120 words you can read in the call area.
Pre-competition briefs
Facing three known opponents on Saturday? Get a phone-ready tactical brief for each, built from your own history.
Patterns across your book
Style archetypes among your opponents, your recurring weaknesses, and whether preparation correlates with winning — for you, specifically.
Compare all tiers →
Everything AI writes is saved to your storage. It's yours forever — even if you cancel.
Your next opponent is someone you've probably faced before.
Start the book now — the first entry takes thirty seconds. Name, club, one observation.
Free forever · No card required · Works offline