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).