# Fast vs FastFlow

The clearest difference is in-app purchases: Fast at none against FastFlow's 2. Fast also leads on device support (3 vs 1). FastFlow's advantage is iOS requirement (16.4 vs 26.0). On price and ads there is nothing between them.

Both are free to download. FastFlow sells 2 in-app purchases, starting at $4.99 per month. Fast asks for nothing beyond the download.

## The numbers

| Metric | Fast | FastFlow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Size | 35 MB | 3 MB |
| Requires iOS | 26.0 | **16.4** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [CodeHive](https://appshunter.io/developer/1196672412) | [DaSecure Solutions LLC](https://appshunter.io/developer/1367132705) |

## 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


### FastFlow

[App page](https://appshunter.io/ios/app/fastflow-fasting-tracker/id6788203046)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Annual | $39.99 | per year |


## Frequently asked questions

### Is Fast free?

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

### Is FastFlow free?

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

### Do Fast or FastFlow have ads?

Neither Fast nor FastFlow shows ads.

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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.*