# Cycle Sister — Period & Fertility Tracker

> Period & Fertility Tracker (iPhone/iPad app by CloudSpirit Limited.)

- Source: https://appshunter.io/ios/app/cycle-sister/id6777260058 (this page in markdown: same URL + `.md`)
- Developer: [CloudSpirit Limited](https://appshunter.io/developer/816154234)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Age rating: 17+
- Requires: iOS 13.0 · 30 MB
- Languages: American English
- Released: 2026-06-10
- Data updated: 2026-07-20
- User reviews in markdown: https://appshunter.io/ios/app/cycle-sister/id6777260058/reviews.md

## What is 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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Monthly Premium | $0.99 | per month |
| Yearly Premium | $9.99 | per year |



## Version history (last 2 releases)

### 1.1 — 2026-07-14

v1.0.7 — Smarter predictions & faster launch

• Fixed: predictions now update immediately when you record a new period start or change settings
• Fixed: ovulation and fertile window no longer overlap with period days
• Improved: calendar markers load asynchronously for smoother scrolling
• Improved: app launches significantly faster — ad and billing SDKs now load in the background
• Fixed: calendar icons and colors now display correctly after marking a date

### 1.0 — 2026-06-10

No release notes.

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All apps by CloudSpirit Limited: https://appshunter.io/developer/816154234

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-20.*