Locket is a private journal for your period and symptoms. Everything you log is encrypted on your phone, and we can't read it.
Free beta on iPhone and Android. See what Locket does.
Record flow, symptoms, mood, basal body temperature, and notes in a fast daily log, and see your estimated next period and current cycle phase at a glance. Set optional daily reminders to log an entry and receive reminders before your period begins.
Import from Apple Health (on iOS devices only), other cycle trackers like Clue and Flo, or a spreadsheet you keep yourself. Imports are preview-first: you see exactly what will be added before anything is saved, everything is encrypted on save, and one tap undoes the whole import.
Export an encrypted backup file protected by a password you choose, and restore it with that password. The same file restores on Android and on iPhone, so moving between platforms keeps your history.
Show your clinician or a trusted person one encrypted snapshot with a QR code. The key is inside the code and never passes through our servers, and after one scan your history is sealed again. Your clinician will get a FHIR bundle with industry-standard medical coding, the same standard hospital systems already read.
Locket is a tracking and record-keeping tool. It does not provide medical advice, diagnosis, or treatment.
Every entry is encrypted with AES-256-GCM before it is stored. The key is generated on your device and kept in the iOS Keychain or Android Keystore. If encryption can't run, Locket won't run. It never falls back to storing your data unprotected.
Locket works entirely on your device, so there's no sign-up and no account. No ads and no user activity trackers in the app.
Tap Erase All My Data and Locket wipes your ledger and destroys the encryption key on the spot.
Keeping every byte on your device wasn't a product decision. For reproductive health data after Dobbs, it was the only responsible way to build.
How do you show a clinician your history without giving anyone ongoing access? A plain-language look at Locket's one-shot share, where the key travels inside the QR code and never touches a server.
Your cycle data should work with your clinician's records system. We built Locket's share format on the FHIR R4 standard, so your clinician gets coded observations instead of screenshots.
Locket is in beta on iPhone and Android. How you join depends on your phone.
Tap the badge to open TestFlight and join with the email on your Apple Account. There's nothing to fill out here.
Google Play only shows the beta to people on our tester list. Enter the email for the Google account you use in the Play Store and we'll add you.
We only use your email to add you to the Android tester list on Google Play. It will not be used for marketing or promotional purposes.
