# todo vs WhenUsed

The clearest difference is iOS requirement: todo at 15.5 against WhenUsed's 17.0. On price and in-app purchases there is nothing between them.

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

## The numbers

| Metric | todo | WhenUsed |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | No |
| Size | 21 MB | 2 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | — | **iPhone** |
| Age rating | 4+ | 4+ |
| Developer | [SHIGERU ARAKI](https://appshunter.io/developer/1506645360) | [Shun Sonohara](https://appshunter.io/developer/1866483080) |

## What reviewers say

### todo

[App page](https://appshunter.io/ios/app/todo-diary/id1636143899)

**In-app purchases:** none


### WhenUsed

[App page](https://appshunter.io/ios/app/whenused/id6757753701)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is todo free?

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

### Is WhenUsed free?

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

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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.*