# Fast.io vs Sundial

The clearest difference is iOS requirement: Sundial at 16.4 against Fast.io's 26.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Fast.io sells 1 one-off in-app purchase and Sundial sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Fast.io | Sundial |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | — |
| Size | 23 MB | 65 MB |
| Requires iOS | 26.0 | **16.4** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Stefan Sturm](https://appshunter.io/developer/416803387) | [Vitalii Iudin](https://appshunter.io/developer/6771651864) |

## 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 |


### Sundial

[App page](https://appshunter.io/ios/app/sundial-fasting-and-omad-timer/id6779303724)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sundial Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Fast.io free?

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

### Is Sundial free?

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

### Do Fast.io or Sundial have ads?

Neither Fast.io nor Sundial 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.*