# チャットTODO vs Simple Diary

The clearest difference is in-app purchases: Simple Diary at none against チャットTODO's 2. チャットTODO's advantage is update cadence (every 3 days vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. チャットTODO sells 2 one-off in-app purchases. Simple Diary asks for nothing beyond the download.

チャットTODO ships an update every 3 days, Simple Diary every 3 months. Both last shipped on October 30, 2026.

## The numbers

| Metric | チャットTODO | Simple Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Every 3 months |
| Size | 17 MB | 8 MB |
| Requires iOS | **16.0** | 16.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kyosuke Noguchi](https://appshunter.io/developer/1767325191) | [Kana Uchida](https://appshunter.io/developer/1819475901) |

## What reviewers say

### チャットTODO

[App page](https://appshunter.io/ios/app/todo-todo/id6739418797)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 開発者への寄付 | $0.49 | one-time |
| 広告の解放 | $0.99 | one-time |


### Simple Diary

[App page](https://appshunter.io/ios/app/simple-diary-myjot/id6747032449)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is チャットTODO free?

チャットTODO is free to download, with in-app purchases available.

### Is Simple Diary free?

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

### Do チャットTODO or Simple Diary have ads?

Both チャットTODO and Simple Diary show ads.

### Which is updated more often, チャットTODO or Simple Diary?

チャットTODO ships an update every 3 days, and Simple Diary every 3 months. Most recently, チャットTODO was updated on October 30, 2026 and Simple Diary on October 30, 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.*