Finally, a period tracker that's actually private.
Your cycle data never leaves your device.
Protected with your PIN. No cloud. No account. No tracking.
Coming soon to iOS & Android.
Thursday · Jul 17
Next period
in 6 days
Jul 23 · window Jul 21–25
Privacy first
Built to reveal nothing
Protected by PIN
A PIN you choose derives the key that encrypts everything. It is never stored or sent anywhere.
Everything stays on your device
Your cycle, symptoms and notes live in an encrypted database on your phone, and only there.
No cloud. No account. No data collection.
There is no sign-up and no server. Nothing to breach, nothing to sell, nothing to leak.
Beautiful tracking
Calm, minimal, and quietly powerful
A timeline, an elegant calendar, mood tracking and adaptive predictions, all in a peaceful dark interface designed to disappear into the background. Whether you are tracking your cycle, trying to conceive, on contraception, or pregnant, Locklune adapts to you.
Next period
in 6 days
Why Locklune
A different set of defaults
Security
Peace of mind, by design
End-to-end local encryption
Your data lives in an AES-256 encrypted database (SQLCipher), unlocked only by your PIN.
PIN lock
A PIN you choose derives the encryption key. It is never stored or transmitted.
Offline support
Everything works with no connection. There is nothing to sync.
No servers
There is no backend to breach, subpoena, or sell. We hold nothing.
No third-party analytics
No SDKs, no trackers, no identifiers. Not in the app, not on this site.
Auto-erase
After 5 incorrect PIN attempts, everything on the device is wiped, so a lost or stolen phone reveals nothing.
Your cycle. Locked to your device.
No account, no cloud, no tracking. Just a calm, private place to understand your body.