# Sync vs Flow

The clearest difference is device support: Sync at 3 against Flow's 1. Sync also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Sync | Flow |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | — |
| Size | 41 MB | 4 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Wei Jian Wong](https://appshunter.io/developer/1805425419) | [拥军 刘](https://appshunter.io/developer/1896777340) |

## 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


### Flow

[App page](https://appshunter.io/ios/app/flow-period-tracker/id6791552767)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sync free?

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

### Is Flow free?

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

### Do Sync or Flow have ads?

Neither Sync nor Flow shows ads.

### Which is updated more often, Sync or Flow?

Sync ships an update every 3 weeks, and Flow every 3 weeks. Most recently, Sync was updated on October 3, 2026 and Flow on October 6, 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.*