Where your data lives, what zero-knowledge means
Substantive content — opponent observations, match reflections, training entries, photos, videos — lives on your connected storage (Google Drive, iCloud, Dropbox). Recsty AB only sees auth, subscription state, and a lightweight pointer shell. We literally cannot read your notes — they're not on our servers.
Two layers. (1) Recsty AB has zero knowledge — always, by architecture, in any mode. Your notes never touch our servers. (2) Optional E2EE adds zero-knowledge from your storage provider: notes are encrypted client-side before upload.
No. That's the trade-off — and the point. The encryption key is derived from your password and lives only in your head. Neither Recsty AB nor your storage provider can help.
If you don't connect a storage provider, OpponentBook runs local-only: everything stays in this device's browser/app storage and nothing syncs to the cloud or to your other devices. You can journal fully offline. Connect Google Drive, Dropbox, or iCloud from Settings → Storage whenever you want cross-device sync — your existing local data uploads on the first sync.
The questions we hear most, answered without hedging. If you don't find what you need, email help@opponentbook.app.
The whole journal is free, forever, on your own storage.
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