# 16文字日記 vs One

The clearest difference is ads: One at none against 16文字日記's shown. One also leads on update cadence (every 3 days vs every 2 months) and iOS requirement (13.0 vs 15.0). On price, 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.

16文字日記 ships an update every 2 months, One every 3 days. The most recent releases landed on October 27, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | 16文字日記 | One |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Ad-supported | — |
| Size | 75 MB | 20 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kenta Fukushima](https://appshunter.io/developer/1514527789) | [Yuga Matsumi](https://appshunter.io/developer/1866567850) |

## What reviewers say

### 16文字日記

[App page](https://appshunter.io/ios/app/16/id6448646374)

This app allows users to record their daily thoughts and memories using only 16 characters. It's designed for those who find long journaling difficult or are short on time, making it easy to maintain a daily record and review past entries.

**Highlights:** 16-character daily entries, Monthly calendar view, Writing reminders, Passcode lock, Easy to continue daily

**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 16文字日記 free?

16文字日記 is free to download, with no in-app purchases.

### Is One free?

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

### Do 16文字日記 or One have ads?

16文字日記 shows ads; One does not.

### Which is updated more often, 16文字日記 or One?

16文字日記 ships an update every 2 months, and One every 3 days. Most recently, 16文字日記 was updated on October 27, 2026 and One on October 13, 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.*