Eluna Cycle
Period and ovulation tracker that keeps your health data on your phone.
Eluna Cycle is a period tracker that never asks who you are. There is no sign-up, no server of ours behind it and no analytics SDK inside it: the cycle you log, the symptoms you note and the predictions the app makes all live in an encrypted database on your own phone. Health data is the most sensitive category most people carry, and the safest place to keep it is the place it never leaves.
What it tracks
- Period days, flow, symptoms, mood and notes, in a calendar you can scroll back through
- Ovulation and fertile window, predicted on the device from your own history
- Cycle length, period length and their variation over time
- Reminders before a period is due, and for the pill, if you take one
- A moon calendar, if you like the ritual of it
Why it is private
- No account: nothing to register, nothing to log in to, nothing to leak
- The database is encrypted on the device
- No advertising SDK and no analytics — the app cannot report on you because it has nothing to report with
- Backups are yours: an encrypted file you keep, or your own cloud, never ours
- Every claim above is visible in the privacy policy, per feature
Reading, not guessing
- Insights explain what the app concluded and from which of your own numbers
- A knowledge base written in plain language, with the medical sources cited
- Irregular and long cycles are handled honestly, with a stated confidence rather than a false certainty
Questions
Does Eluna Cycle work offline?
Yes. Everything — logging, predictions, reminders, the knowledge base — runs on the device. The app is usable with the network switched off, permanently.
Do I need an account?
No. There is no registration at all. Nothing identifies you to us, because nothing reaches us.
Where is my health data stored?
In an encrypted database on your phone. If you turn on a backup, the file is encrypted with a key we never see and stored in your own cloud.
Is it free?
Yes. No subscription, no paywall, no locked features. There is a tip jar in Settings, and it unlocks nothing.
The rules every Eluna app follows
- No sign-up, ever
- No subscriptions, no paywalls
- No analytics or crash SDKs
- No ads
- Tips, if you feel like it; they unlock nothing
- Encrypted, user-owned backups
What each app does and does not send anywhere is written out, per app, in the privacy policy and terms of use.
The other Eluna apps
- Eluna Screen TV show, anime and movie tracker with an episode calendar and no account.
- Eluna Budget Expense tracker and budget planner with no bank login and no account.
- Eluna Reader Offline ebook reader for EPUB, PDF, FB2, MOBI, DjVu and comics.
- Eluna Media Video, audio and photo converter that runs entirely on your phone.
- Eluna Subs Subscription tracker that reminds you before the money leaves.