Demetra: Cycle Tracking

Track your cycle, symptoms, mood, energy, and fertile window with a calm, privacy-first period tracker designed for every phase.

Demetra is a privacy-first menstrual cycle tracker. No sign-up, no login, no external services, no analytics. All data stays on the user's device.

The reviewer can complete onboarding with any data:

1. Tap Begin on Welcome
2. Type any nickname; sliders for age/height/weight
3. Pick any past date for last period
4. Tap through Medical / Goals with any selections
5. Tap Open Demetra to enter the main app

All four bottom-bar tabs (Today / Cycle / Log / Library) are accessible immediately. Settings is the gear icon on Today.

External services: none. Cycle math, articles, and advice run locally; no AI, no analytics, no networking. SQLite database on device.

Phrasing is wellness-focused, non-diagnostic ("patterns", "may be worth discussing"). Not a medical device.