Cycle Sister
CloudSpirit Limited Health & Fitness iPhoneiPadiPod touch
Cycle Sister is a free Health & Fitness app for iPhone and iPad by CloudSpirit Limited. Requires iOS 15.0. Updated September 11, 2026.
- Price
- Free
- on the App Store
- Size
- 30 MB
- Age 17+
- Updated
- Sep 11
- 2026 · v1.2
Screenshots
About Cycle Sister
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
What’s new
Version 1.2 · Updated 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.
App privacy
The developer, CloudSpirit Limited, reported these privacy practices to Apple.
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Usage Data: Advertising Data
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Usage Data: Advertising Data
Used for: Third-Party Advertising, Analytics
Alternatives to Cycle Sister
Looking for apps like Cycle Sister? Here are 6 similar apps on the App Store.
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PeriodAI
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Phase: Cycle & Energy Planner
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Flory: Period & Cycle Tracker
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Siela
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AxisFlow: Period Tracker Log
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TsukiLift - Cycle & Strength
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Cycle Sister | – | Free | September 11, 2026 | |
| PeriodAI | – | Free | Oct 26, 2026 | Compare |
| Phase: Cycle & Energy Planner | – | Free | Apr 13, 2026 | Compare |
| Flory: Period & Cycle Tracker | – | Free | Oct 23, 2026 | Compare |
| Siela | – | Free | Oct 30, 2026 | Compare |
| AxisFlow: Period Tracker Log | – | Free | Sep 10, 2026 | Compare |
| TsukiLift - Cycle & Strength | – | Free | Oct 22, 2026 | Compare |
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