Sync - Find Your Peak
Find Your Peak
Free · Designed for iPad. Not verified for macOS.
Now free. No ads, no accounts, no in-app purchases. Private cycle tracking with peak predictions for couples, and everything stays on your phone.
Your intimacy data is yours alone. Period.
Sync is a free cycle tracker that predicts your peak days for intimacy and never shares a byte of your data. No accounts. No cloud. No tracking. No ads. No in-app purchases.
Free, and Still Private
Most free apps make money from your data. Sync doesn't collect any. Everything you log stays on your phone. I can't see it, sell it, or share it, because I never have it.
Smart Predictions
Sync learns from the periods you log and estimates your peak window and your next period. Predictions are estimates, not medical advice, and Sync is not birth control.
Personalize Your Experience
Choose from four personality modes that match how you want the app to talk to you, from playful to bold and direct.
Features:
- Simple period logging, including for earlier days
- Calendar with logged periods, expected periods and peak days
- Countdown to your next peak window
- Reminders before your peak window and your period
- Home screen and lock screen widgets
- Optional Apple Health sync
- Works completely offline
- No account required
- No ads, ever
Your body. Your data. Your business.
Find your peak.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Sync is now free. Every feature, no trial, no in-app purchases.
- Log a period start or end for an earlier day, not just today
- Fix or delete past periods in Cycle History
- Reminders now arrive: the morning a peak window starts and the evening before a period
- Widgets move to the next cycle day at midnight without opening the app
- The calendar shows logged periods, expected periods and future peak days
- Predictions handle late periods and ignore accidental double logs
- Apple Health sync saves every period day and imports past periods correctly
- Siri and Shortcuts read and log your real data
- Fixed: "days until next period" was a day off
The developer, Joshua Duffy, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Joshua Duffy
- Size
- 1.8 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
16+
- 16+
- Frequent
Mature or Suggestive Themes
- Copyright
- © 2026 Pulse Labs