# Fast vs ByteFast

The clearest difference is update cadence: Fast at every 2 days against ByteFast's weekly. On price, ads, in-app purchases and device support there is nothing between them.

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

Fast ships an update every 2 days, ByteFast weekly. The most recent releases landed on September 12, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Fast | ByteFast |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Weekly |
| Size | 6 MB | 10 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Invotek AS](https://appshunter.io/developer/1836667478) | [ByteSeed](https://appshunter.io/developer/1896674402) |

## What reviewers say

### Fast

[App page](https://appshunter.io/ios/app/fast-e-intermittent-fasting/id6759206116)

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

**In-app purchases:** none


### ByteFast

[App page](https://appshunter.io/ios/app/bytefast-fasting-tracker-168/id6769618458)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fast free?

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

### Is ByteFast free?

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

### Do Fast or ByteFast have ads?

Neither Fast nor ByteFast shows ads.

### Which is updated more often, Fast or ByteFast?

Fast ships an update every 2 days, and ByteFast weekly. Most recently, Fast was updated on September 12, 2026 and ByteFast on September 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.*