A calm period tracker that keeps what you log on your phone.
Tsuki is a calm, simple period tracker. Log your periods, flow and symptoms, and see when your next period may start, all on your phone, with no account and no internet connection. Once you've logged a few periods, Tsuki shows an estimated date range for the start of your next period, based on the periods you've logged. Open "How this is estimated" to see what was used and how the range was worked out. When there isn't enough data yet, Tsuki tells you instead of guessing. Log period dates, flow and spotting, ten common symptoms plus up to ten of your own, how strong each symptom was, and a short note for any day. See it all on a month or year calendar, and review every cycle and period length you've recorded, in plain numbers. Optional reminders, an optional app lock, and exports to a backup file (optionally encrypted with a passphrase), CSV or a PDF summary are all built in. There are no ads and no analytics. Tsuki estimates only the start of your next period. It does not estimate fertile days or ovulation, and its estimates are not medical advice.
See an estimated date range for the start of your next period, based on the periods you've logged, and open "How this is estimated" to see how it was worked out.
Log flow, spotting, ten common symptoms plus up to ten of your own, how strong each one was, and a short note.
Month and year views of your periods, plus every cycle and period length you've recorded, in plain numbers.
Optional reminders before your next estimated period and for daily logging. They show no dates or health details.
No account, no internet connection, no ads and no analytics. What you log stays on your phone.
Optionally require your phone's screen lock or biometrics to open the app.
Save a backup file (optionally encrypted with a passphrase), a CSV or a PDF summary, and restore from your own backup.
Follows your phone's theme, or choose light or dark yourself.
No. There's no sign-up; everything you log is kept on your phone.
No. Tsuki doesn't have Android's internet permission and works fully offline.
From the periods you've logged: your shortest and longest recent cycle lengths are each added to your last period start, and the next period is estimated to start between those two dates. The app shows exactly what it used.
No. It estimates only the start of your next period, and its estimates are not medical advice.
Export a backup file in Settings, then restore it on the new phone before logging anything there. On Android 12 and later, a direct device-to-device transfer can also bring it across.
Yes, Tsuki is free with ads. Premium removes ads and unlocks extras like browsing past days and custom cup sizes. You can also try premium for a few hours by watching a short video.
Settings › Delete all data removes everything, and so does uninstalling. Files you exported earlier aren't affected.
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