# Fast.io vs Just Fasting

The clearest difference is in-app purchases: Just Fasting at none against Fast.io's 1. Just Fasting also leads on update cadence (every 2 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

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

Fast.io ships an update monthly, Just Fasting every 2 days. The most recent releases landed on October 13, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Fast.io | Just Fasting |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Size | 23 MB | 2 MB |
| Requires iOS | **26.0** | 26.4 |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Stefan Sturm](https://appshunter.io/developer/416803387) | [Matthew Clark](https://appshunter.io/developer/1797183728) |

## What reviewers say

### Fast.io

[App page](https://appshunter.io/ios/app/fastio-fasting-timer/id6755233993)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fast.io Pro | $6.99 | one-time |


### Just Fasting

[App page](https://appshunter.io/ios/app/just-fasting/id6761426623)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fast.io free?

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

### Is Just Fasting free?

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

### Do Fast.io or Just Fasting have ads?

Neither Fast.io nor Just Fasting shows ads.

### Which is updated more often, Fast.io or Just Fasting?

Fast.io ships an update monthly, and Just Fasting every 2 days. Most recently, Fast.io was updated on October 13, 2026 and Just Fasting 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.*