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. <b>What you can track</b> • 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 <b>What Cycluna shows you</b> • 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 <b>Honest by design</b> 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. <b>Private by design</b> • 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. Cycluna is a wellness and education tool. It is not a medical device, it does not diagno