# Sync vs Serenity Time

The clearest difference is in-app purchases: Sync at none against Serenity Time's 1. Sync also leads on update cadence (every 3 weeks vs every 2 months) and iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Serenity Time sells 1 one-off in-app purchase. Sync asks for nothing beyond the download.

Sync ships an update every 3 weeks, Serenity Time every 2 months. The most recent releases landed on September 2, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Sync | Serenity Time |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sync-private-period-tracker/id6743987631/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 41 MB | 382 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Wei Jian Wong](https://appshunter.io/developer/1805425419) | [Alma-Innovations](https://appshunter.io/developer/1841250935) |

## What reviewers say

### Sync

[App page](https://appshunter.io/ios/app/sync-private-period-tracker/id6743987631)

A privacy-focused period tracker that stores all your data locally on your device. It offers a simple and ad-free experience for managing your menstrual cycle.

**Highlights:** Privacy-focused design, Local data storage, Ad-free experience, Simple interface, Cycle tracking

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Serenity Time

[App page](https://appshunter.io/ios/app/serenity-time/id6752860185)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Serenity Time Full Unlock | $2.99 | one-time |


## Frequently asked questions

### Is Sync free?

Sync is free to download, with no in-app purchases.

### Is Serenity Time free?

Serenity Time is free to download, with in-app purchases available.

### Do Sync or Serenity Time have ads?

Neither Sync nor Serenity Time shows ads.

### Which is updated more often, Sync or Serenity Time?

Sync ships an update every 3 weeks, and Serenity Time every 2 months. Most recently, Sync was updated on September 2, 2026 and Serenity Time on September 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*