Know your fertile and safe days, at a glance.
SafeDayz calculates the days of your cycle when you're most and least likely to conceive — a fast, private, offline fertility awareness calculator.
Damurka
Health · Google Play
Calculation capabilities
Cycle input
Enter the start date of your last period and your usual cycle length — SafeDayz does the rest, instantly and offline.
Fertile window prediction
See the days in your cycle when you're most likely to be fertile, calculated from standard cycle-length formulas.
Safe days calculation
See the days in your cycle when you're least likely to be fertile — the "safe days" — laid out on a simple calendar view.
Data & safety, plainly stated
Nothing collected by us
Your cycle dates stay on your device. Damurka does not collect or receive your personal health data, and there's no server to send it to.
No accounts, no cloud sync
SafeDayz works entirely offline. There's nothing to sign into and nothing stored anywhere but your device.
Free, supported by ads
Google AdMob shows ads to keep the app free to use. No premium tier, no in-app purchases.
Important note
SafeDayz estimates fertile and safe days from standard cycle-length calculations. It is a reference tool, not a guaranteed method of contraception or conception, and does not replace professional medical judgment — see our Terms of Service for the full disclaimer.
Get SafeDayz on Google Play
Free to download, works offline, and keeps your data on your device.