# Skill Notes vs Four Line Diary / ４行日記

The clearest difference is update cadence: Four Line Diary / ４行日記 at every 4 days against Skill Notes's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

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

Skill Notes ships an update every 3 months, Four Line Diary / ４行日記 every 4 days. The most recent releases landed on October 25, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Skill Notes | Four Line Diary / ４行日記 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Size | 13 MB | 31 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kazuya Fujita](https://appshunter.io/developer/1358322690) | [arai.me](https://appshunter.io/developer/1652629805) |

## What reviewers say

### Skill Notes

[App page](https://appshunter.io/ios/app/skill-notes/id1501945543)

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Skill Notes free?

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

### 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.

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

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

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

Skill Notes ships an update every 3 months, and Four Line Diary / ４行日記 every 4 days. Most recently, Skill Notes was updated on October 25, 2026 and Four Line Diary / ４行日記 on October 10, 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.*