# チャットTODO vs 3 Seconds Memo

The clearest difference is update cadence: チャットTODO at every 3 days against 3 Seconds Memo's weekly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. チャットTODO sells 2 one-off in-app purchases and 3 Seconds Memo sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

チャットTODO ships an update every 3 days, 3 Seconds Memo weekly. The most recent releases landed on October 13, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | チャットTODO | 3 Seconds Memo |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | — | Free with in-app purchases |
| Size | 17 MB | 72 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kyosuke Noguchi](https://appshunter.io/developer/1767325191) | [Aiju Kawase](https://appshunter.io/developer/6773546342) |

## 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 |


### 3 Seconds Memo

[App page](https://appshunter.io/ios/app/3-seconds-memo-simple-notes/id6773546340)

This app allows for rapid note-taking and idea capture, opening directly to a creation screen. It offers offline functionality, local data storage, and organizational tools like categories and tags. Premium features include ad-free usage, data export, and custom categories.

**Highlights:** Immediate memo creation on launch, Offline functionality, Local-only data storage, Organize with categories and tags, Attach photos to memos, Lock Screen widget for quick access, Export to Markdown and CSV (Premium)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Montly Plan | $2.99 | per month |
| Annual Plan | $29.99 | per year |


## 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 3 Seconds Memo free?

3 Seconds Memo is free to download, with in-app purchases available.

### Do チャットTODO or 3 Seconds Memo have ads?

Both チャットTODO and 3 Seconds Memo show ads.

### Which is updated more often, チャットTODO or 3 Seconds Memo?

チャットTODO ships an update every 3 days, and 3 Seconds Memo weekly. Most recently, チャットTODO was updated on October 13, 2026 and 3 Seconds Memo 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.*