# Sync - Private Period Tracker — Private cycle and partner sync

> Private, ad-free period tracker with local data storage. (iPhone/iPad app by Wei Jian Wong.)

- Source: https://appshunter.io/ios/app/sync-private-period-tracker/id6743987631 (this page in markdown: same URL + `.md`)
- Developer: [Wei Jian Wong](https://appshunter.io/developer/1805425419)
- Category: Health & Fitness
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 12+
- Requires: iOS 15.1 · 40 MB
- Languages: American English
- Released: 2025-04-03
- Data updated: 2026-08-12
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/sync-private-period-tracker/id6743987631/reviews.md

## What is Sync?

Sync Period is a local-first cycle tracker built for simple daily use and private partner support.

Log periods, symptoms, moods, and notes; view your calendar and pattern summaries; set reminder. Your cycle history is encrypted on your device.

Private predictions adapt to your recent cycle history and confirmed corrections entirely on your device. Sync shows an honest likely-start window and confidence level, learns recurring pre-period patterns, and can use an enabled BBT signal or positive ovulation test without uploading those health details. Predictions become more cautious when history is sparse or variable.

Partner sharing is optional and off by default. You choose which supported cycle details to share. Updates are end-to-end encrypted and require the complete private invite to open. Each encrypted relay update expires after no more than 30 days; active sharing renews that rolling expiration when a new update is published. Recent physical symptoms and flow, sex-drive and intimacy check-ins, and moods are three separate opt-ins that can each be turned off again. Intimate sharing is off by default and never indicates consent. Discharge, medications, written notes, and other sexual details remain private.

Sync Period has no ads, no behavioral analytics SDKs, and no required account. You can export a private backup or permanently delete local app data at any time.

Cycle predictions and pattern summaries are estimates. Sync Period does not provide diagnosis, contraception, or medical advice.

## Key features

- Privacy-focused design
- Local data storage
- Ad-free experience
- Simple interface
- Cycle tracking

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/sync-private-period-tracker/id6743987631/reviews.md

### 5/5 — Amazing!

*2025-04-07*

Such a thoughtful and detailed/straight forward period app - includes everything I need to track my period and also helps explain the different phases of my cycle and what to expect. ALSO no paid ads or any of those marketing gimmicks that auto pop up like other period apps out there!

## Frequently asked questions about Sync

### Does Sync have ads?

No, Sync is completely ad-free, offering an uninterrupted experience for users.

### How is my data protected in Sync?

All your data is stored locally on your device, ensuring maximum privacy and security without cloud synchronization.

### What devices is Sync available on?

Sync is available for iPhone, iPad, and iPod devices.

### What is the age rating for Sync?

Sync has an age rating of 12+, making it suitable for younger users and adults.

### How often is Sync updated?

The app was last updated on April 6, 2025, indicating recent development and support.

### What is the user sentiment for Sync?

Based on the available data, Sync has a perfect 5.0-star rating from one review, suggesting very positive initial user feedback.

### Is there a cost to use Sync?

Sync is available for free, with no in-app purchases or subscription fees required.

## Version history (last 3 releases)

### 2.0 — 2026-08-11

Sync V2 is our biggest update yet:

- Private, on-device predictions learn from confirmed cycles and corrections.
- Clearer likely-start windows and confidence for regular, changing, and 20–60-day histories.
- Faster, more consistent period, symptom, mood, and note logging across Home, Calendar, and Insights.
- Privacy-first partner sharing with encrypted private invites and separate controls for timing, symptoms, moods, and intimacy check-ins.
- A fully adaptive iPad experience with rotation, Split View, and Stage Manager support.
- Refined accessibility, clinician summaries, and prediction explanations.

Your cycle data stays encrypted on your device unless you choose to share a protected partner update. Predictions are estimates, not medical advice.

### 1.0.1 — 2025-04-06

bug fixes, feature updates

### 1.0 — 2025-04-01

No release notes.

## Apps similar to Sync

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Tyd Period Tracker](https://appshunter.io/ios/app/tyd-period-tracker/id6475370726) | 5.0 (1) | Free | Health & Fitness |
| [28: Track Period & Intimacy](https://appshunter.io/ios/app/28-track-period-and-intimacy/id6748367323) | — | Free | Health & Fitness |
| [Birth Control Reminder: Lunara](https://appshunter.io/ios/app/birth-control-reminder-lunara/id6746929300) | — | Free | Health & Fitness |
| [Re:Cycle](https://appshunter.io/ios/app/recycle/id6443411858) | 5.0 (1) | Free | Health & Fitness |
| [Dotly - Period PMS Tracker](https://appshunter.io/ios/app/dotly-period-pms-tracker/id6748542384) | — | Free | Health & Fitness |
| [Monthly PRIVATE Period Tracker](https://appshunter.io/ios/app/monthly-private-period-tracker/id6471178651) | 4.6 (15) | Free | Health & Fitness |

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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 2026-08-12.*