# Do One Thing vs ComplicaJSON

The clearest difference is device support: Do One Thing at 4 against ComplicaJSON's 2. Do One Thing also leads on iOS requirement (13.0 vs 18.5). On price, ads 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 | Do One Thing | ComplicaJSON |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 days | — |
| Size | 6 MB | 14 MB |
| Requires iOS | **13.0** | 18.5 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Zeyu Yin](https://appshunter.io/developer/1362976339) | [Almost Good Enough ApS](https://appshunter.io/developer/1067555461) |

## What reviewers say

### Do One Thing

[App page](https://appshunter.io/ios/app/do-one-thing-finger-diary/id1543636840)

**In-app purchases:** none


### ComplicaJSON

[App page](https://appshunter.io/ios/app/complicajson/id6748659803)

**In-app purchases:** none


## Frequently asked questions

### Is Do One Thing free?

Do One Thing is free to download, with no in-app purchases.

### Is ComplicaJSON free?

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

### Do Do One Thing or ComplicaJSON have ads?

Neither Do One Thing nor ComplicaJSON 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.*