Mobile app · Everyday life

NER Cycle App

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

Completely free
Android
Open source

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by F-Droid
License: Apache-2.0 — Open source (permissive)confirmed by F-Droid
Open source: Yes
Commercial use: Yesconfirmed by F-Droid
Account required: not documented
Credit card required: Noconfirmed by F-Droid
Watermark: Not applicable
Ads: No
Platforms: AndroidEstablished by Android: F-Droid
Distribution: Available on F-Droid
Publisher: Benedikt Burger
Latest version: 0.4.0 (27 October 2026)
Latest activity: 27 October 2026
Source code: github.com/BenediktBurger/cycle-app

Overview

Features described in its F-Droid listing and in its GitHub repository: statistics and charts, data import and export, offline use.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“— the baseline drawn from the six prior low measurements, counts, lines, and statistics (cycle and phase lengths).” — F-Droid, 10 November 2026
“PDF export: export the evaluation as a print-ready PDF.” — F-Droid, 10 November 2026
“Export and Import in the settings — your data always stays” — F-Droid, 10 November 2026
“A local-first, open-source cycle app for Android and iOS (primary targets) and the browser (web app, supported secondary target), to track menstrual-cycle symptoms and evaluate them manually per” — GitHub, 10 November 2026

At a glance

All of NER Cycle App is free: no feature is locked behind a paid plan, and its code is open.

Its licence (Apache-2.0) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

Open source code
No advertising
Commercial use allowed

Sources and checks

Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) — 6 November 2026
Last technical check: 6 November 2026
Description from F-Droid — F-Droid (citation courte)

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