Rito.
A minimalist, offline-first period and cycle tracker. Local encrypted storage, on-device prediction — no accounts, no cloud, no ads.
Download latest releaseFully offline
Nothing ever leaves your device. No servers, no accounts.
No network permission is even requested — the app can't phone home if it wanted to. No analytics, no crash reporting, no telemetry. Works the same in airplane mode as it does with full signal.
Encrypted storage
All logs are stored locally with AES encryption.
Your encryption key is generated on-device and kept in the OS keystore (Android Keystore / iOS Keychain) — never written to disk in plaintext. Optional Face ID / fingerprint lock before the app even opens.
On-device prediction
Cycle predictions run locally — no data ever needs to sync.
A Bayesian model plus a Kalman filter learn your cycle from your own logs, entirely on-device. Predictions get sharper the more you log, with no server round-trip needed to compute them.