NER Cycle App

This app helps you track menstrual-cycle symptoms day by day and evaluate
your records manually following the NER rules (Rötzer), in the spirit of
INER.

The evaluation stays with you: you place every mark on the cycle chart
yourself. The app only does the arithmetic you would otherwise do by hand
— the baseline drawn from the six prior low measurements, counts, lines,
and statistics (cycle and phase lengths). It computes and displays; it
never suggests and never decides. For a reliable interpretation of
fertility you need knowledge of the method — from a textbook or a course.

The app is in beta — export your data regularly and before every update
via Export in the settings.

Features:

• All your data stays on the device — no cloud, no analytics, no network
permission.
• Language: German and English — follows your system language or can be
switched in the app.
• Daily entry of basal body temperature (with exclusion flags for
disturbances such as illness, alcohol or a late bedtime), bleeding,
cervical mucus in the NER shorthand notation (t, Ø, f, S), optional
cervix, pain, sex, and notes.
• Evaluation tools: first temperature above the baseline, count of low
measurements, mucus peak day, sympto-thermal fertile window, exclusion
of disturbed days.
• PDF export: export the evaluation as a print-ready PDF.
• Import from Drip: bring in existing data from the Drip app (CSV export).
• Export and Import in the settings — your data always stays
your own.
• Open source; licensed under Apache-2.0.

Note: "NER Cycle App" is a working title; the final name has not been
chosen yet.

- Rename: start, middle, end to morning, midday, evening
- cycle shows cervix position and notes
- only relevant statistics are shown