# Four Line Diary / ４行日記 vs One

The clearest difference is iOS requirement: Four Line Diary / ４行日記 at 11.0 against One's 13.0. On price, update cadence, 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.

Four Line Diary / ４行日記 ships an update every 4 days, One every 3 days. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Four Line Diary / ４行日記 | One |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 3 days** |
| Size | 31 MB | 20 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [arai.me](https://appshunter.io/developer/1652629805) | [Yuga Matsumi](https://appshunter.io/developer/1866567850) |

## What reviewers say

### Four Line Diary / ４行日記

[App page](https://appshunter.io/ios/app/four-line-diary/id6474243387)

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

**In-app purchases:** none


### One

[App page](https://appshunter.io/ios/app/one-line-diary-mood-log/id6757390722)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Four Line Diary / ４行日記 free?

Four Line Diary / ４行日記 is free to download, with no in-app purchases.

### Is One free?

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

### Do Four Line Diary / ４行日記 or One have ads?

Neither Four Line Diary / ４行日記 nor One shows ads.

### Which is updated more often, Four Line Diary / ４行日記 or One?

Four Line Diary / ４行日記 ships an update every 4 days, and One every 3 days. Most recently, Four Line Diary / ４行日記 was updated on November 4, 2026 and One on October 31, 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.*