Cycluna

Cycluna is a calm, private place to follow your cycle — and the moon alongside it.

Everything stays on your phone. There is no account to create, no sign-up, and no cloud. Cycluna has no internet permission at all, so your data cannot be sent anywhere — because there is nowhere for it to go.

What you can track

• Period start dates, cycle length and period length

• Mood, with a note when you want one

• Headaches — time, intensity, symptoms and possible triggers

• Journal entries for everything else

What Cycluna shows you

• Where you are in your cycle today, and which phase you are in

• Your next period and fertile window, as estimates

• A month calendar of your logged and predicted days

• The moon's phase for every day, from real lunar maths — offline

• Hormone reference curves for a typical cycle, to learn from

• Mood patterns three ways: day by day, across your cycle phases, and through the lunar month

Honest by design

Cycluna names a pattern only when there is enough data to support one. Log too little and it says so, rather than inventing an insight. When a period is overdue it says that plainly instead of quietly sliding the prediction forward. And it never suggests the moon affects your body — research has not established that link, so the moon view describes your own entries and nothing more.

Private by design

• No account, no email, no identifier of any kind

• No analytics, no trackers, no advertising, no crash reporting

• No internet permission — the app cannot make network requests

• Left out of Android cloud backup and device-to-device transfer

• Optional fingerprint or face unlock

• Export everything as a readable file, whenever you like

• Delete everything permanently, from inside the app

Reminders for your period, your fertile window, and a gentle daily check-in are scheduled entirely on your device. No push server is involved.