Cycle Sister
Period & Fertility Tracker
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Free
In-App PurchasesWith Ads
Rating summary
About
Cycle Sister is a private, local-first period and fertility tracker. Log your period cycles, track predictions for next cycle, fertile window, ovulation day, and safe windows. All data is kept 100% secure and stored locally on your device.
Key features include:
• Period start and length logging
• Predictions for next periods and ovulation days
• Color-differentiated safe/ovulation/predicted periods
• Multi-profile support for recording multiple people (Pro features)
• Local backup and restore with strong password encryption
Privacy Policy: https://sites.google.com/view/cycle-care-app/privacy
Terms of Use: https://sites.google.com/view/cycle-care-app/terms
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What's New in Cycle Sister
1.2
September 11, 2026
Period reminders are here — get a gentle heads-up a few days before your next period, so you're always prepared. New • Period reminders: schedule a warm reminder 1–7 days before your next predicted period, and choose exactly how early. • Help & tutorial: a built-in help page plus a step-by-step walkthrough for first-time users, in your language. Improved • No more full-screen ads — Cycle Sister opens straight to your calendar. • A faster, lighter start so you can log your cycle right away.
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Subscriptions & In-App Purchases
Monthly Premium
Monthly Premium
$0.991 Month
