# Fast vs Body Rhythm

The clearest difference is in-app purchases: Fast at none against Body Rhythm's 1. Fast also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Body Rhythm sells 1 one-off in-app purchase. Fast asks for nothing beyond the download.

Fast ships an update every 2 weeks, Body Rhythm every 9 days. The most recent releases landed on October 30, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Fast | Body Rhythm |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Size | 35 MB | 15 MB |
| Requires iOS | **26.0** | 26.2 |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [CodeHive](https://appshunter.io/developer/1196672412) | [阳 张](https://appshunter.io/developer/1832378186) |

## What reviewers say

### Fast

[App page](https://appshunter.io/ios/app/fast-intermittent-fasting/id6741595659)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### Body Rhythm

[App page](https://appshunter.io/ios/app/body-rhythm/id6760245650)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rhythm Pro | $2.99 | one-time |


## Frequently asked questions

### Is Fast free?

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

### Is Body Rhythm free?

Body Rhythm is free to download, with in-app purchases available.

### Do Fast or Body Rhythm have ads?

Body Rhythm shows ads; Fast does not.

### Which is updated more often, Fast or Body Rhythm?

Fast ships an update every 2 weeks, and Body Rhythm every 9 days. Most recently, Fast was updated on October 30, 2026 and Body Rhythm on November 9, 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.*