Selene
A period tracker that cannot share your data — not because we promise, but because the architecture makes it impossible.
Get notified at launchPrivacy
No accounts. No servers. No cloud. Data stays encrypted in Android Keystore, on your phone alone.
All data encrypted at rest. The same standard used by banks and governments.
No analytics SDK. No advertising SDK. No tracking SDK. Nothing phones home.
Clinical frameworks
Pictorial Blood Assessment Chart — heavy menstrual bleeding scoring
Premenstrual Dysphoric Disorder — DSM-5 diagnostic criteria
Endometriosis — diagnosis and management guideline
Updated May 2026 — Rotterdam diagnostic criteria
When a threshold is met, Selene surfaces a quiet prompt — not an alert. Just enough to start a conversation with your GP.
One tap generates a clinician-ready summary of your relevant data — cycle history, symptom patterns, framework flags. Ready for your appointment.
Why Selene exists
2021
FTC finds Flo shared intimate health data with Facebook and Google without consent. Millions of users' period and pregnancy data was sent to third parties they never agreed to.
2025
Cambridge University researchers publish a call for a privacy-first period app — no accounts, on-device processing only. The specification is clear: data never leaves the phone.
2026
Selene. Built to the Cambridge specification. Every design decision traces back to those two words: on-device only.
Features
Cycle tracking with clinical intelligence
Symptom and mood logging
NHS/NICE framework mapping
GP Summary export
One-off £3.99 — no subscription ever
Dark, calm design — no pink, no pastels
Launch
One email when Selene launches. Nothing else, ever.