NER Cycle App

io.github.benediktburger.cycleapp

Local cycle evaluation per the NER rules (Rötzer) — data stays on device.

Republished from GitHub / F-Droid by the Zapstore main account.

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.

First release: Oct 22, 2026, 1 total release.

Most recent release: Oct 22, 2026.

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Releases

Oct 22, 2026 0.4.0

SHA-256 certificate fingerprint: 0aa5749804b8ed9e3c207f851b5902775d762207d60c2485a26b5d75eff5355b APK SHA-256: cycle-app-0.4.0-armeabi-v7a.apk 863fc5aa5ebc730f9f4f619e8088298cac9f6480d8a0847fae3797c33e4c6f7a APK SHA-256: cycle-app-0.4.0-arm64-v8a.apk 68a89b4d998537b7b5ab62f0b6ac86f08d15c2170ee0340c1552e914df265d54 APK SHA-256: cycle-app-0.4.0-x86_64.apk 66a47bf766add92527b1a9c606fb135f264c9bbe1c9f17fee3db5f0561c1b2b3  ## What's new Custom diary categories: sections such as sport or medication with your own entries — also in the PDF, export and import.

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Under "What to track" you hide sections you don't need: temperature, mucus, cervix, sex, pain. Temperature on a 0.05 K scroll wheel; enter your measurement method — it appears in the chart and PDF. The PDF export shows every calendar day. Backup reminder with interval and last export. Web: browser storage status in Settings.  ## What's Changed * Release v0.3.0 by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/96 * Update non-major dependency updates by @renovate[bot] in https://github.com/BenediktBurger/cycle-app/pull/90 * Lock file maintenance by @renovate[bot] in https://github.com/BenediktBurger/cycle-app/pull/99 * ci: make OSV dependency scan blocking and gate CI through ci-status by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/100 * Center rail header prototypes on the full rail width and split the °C… by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/102 * Add setting to show/hide diary entries by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/104 * add temperature measurement method by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/103 * add independent GitHub pages for different branches by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/106 * Refactor tests by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/107 * feat(diary): labeled section headers with info bottom sheets on the entry form by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/105 * docs: state gh-pages protection as deletion-only ruleset by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/109 * Enable hide temperature option by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/110 * Make default.txt a hand-maintained changelog instead of a generated symlink by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/111 * Fix bleeding text according to the most recent version by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/112 * guide users to create a new method entry on any method change by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/116 * Rename German "Sex" to "Geschlechtsverkehr" and mark the diary entry with (X) by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/117 * publish the release notes with a What's new summary from the English changelog by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/118 * clarify branch-preview workflow inputs and document the operator procedure by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/122 * Add scrollable temperature entry in 0.05 K steps by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/119 * replace the temperature-range dropdowns with a RangeSlider by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/127 * fix(pdf): export every calendar day of the cycle span, not only tracked days by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/128 * Increase space for notes by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/129 * Lock file maintenance by @renovate[bot] in https://github.com/BenediktBurger/cycle-app/pull/126 * cleanup test suite by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/131 * add customizable notes by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/121 * Update dependency gradle to v9.8.2 by @renovate[bot] in https://github.com/BenediktBurger/cycle-app/pull/130 * Cleanup docs by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/132 * webapp as secondary target and add backup reminder by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/133 * Specify sex as sexual intercourse by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/135 * fix custom config and custom marks export by @BenediktBurger in https://github.com/BenediktBurger/cycle-app/pull/136 **Full Changelog**: https://github.com/BenediktBurger/cycle-app/compare/v0.3.0...v0.4.0