Know your fertile and safe days, privately.
Safe Days shows the days of your cycle when you're most and least likely to conceive, learns from the periods and body signs you log, and reminds you before your fertile window. Your cycle data never leaves your phone.
Damurka
Health · Google Play
What it does
Your cycle at a glance
A ring of your cycle and a colour calendar show period, fertile and safe days, the next period and the next fertile window.
Tracks and learns
Log periods, sex, symptoms, mood, temperature and cervical mucus. After 3 cycles, it works from your own history.
Watches for body signs
Fertile mucus or a positive ovulation test marks the next days "take care". Irregular cycles are flagged, so you know when to be careful.
Reminders
Before your period, before your fertile window and when safe days begin. Discreet mode keeps cycle words off the lock screen.
Insights and a doctor report
See your cycle lengths and temperature over time, and make a PDF summary to take to a doctor or health worker.
Or just calculate
Don't want to track? The quick calculator works from your last period and cycle lengths, and saves nothing else.
Data & safety, plainly stated
Stays on your phone
Your periods and logs are stored only on your phone. There are no accounts and no server, so we never see them.
Locked and discreet
Lock the app with your fingerprint or PIN, hide it from recent apps, and swap its icon for a plain calendar.
Your backups, your choice
Back up to Google Drive or anywhere you choose. The file goes only where you save it.
Free, with an optional Pro
Free, or Pro once
The calendar, logging, warnings, insights and reminders are free. A one-time Pro purchase removes ads and adds backup, the doctor report, charts, app lock, a disguised icon, your own reminder time and a widget.
Or watch 3 videos
Not ready to buy? Watch 3 short videos to unlock everything in Pro, without ads, for 24 hours.
Supported by ads
The free version shows Google AdMob ads. Your cycle data is never shared with advertisers.
Important note
Safe Days estimates fertile and safe days with the calendar method. Used correctly every cycle, about 5 in 100 women using calendar methods get pregnant in a year; as people usually use them, about 12 in 100. It is not a guaranteed method of contraception, doesn't protect against infections, and doesn't replace a doctor's advice — see our Terms of Service for the full disclaimer.
Get Safe Days on Google Play
Free to download, works offline, and keeps your cycle data on your phone.