# 3sec Diary vs Otasuke Kototen

The clearest difference is in-app purchases: Otasuke Kototen at none against 3sec Diary's 1. Otasuke Kototen also leads on update cadence (every 3 weeks vs every 26 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 3sec Diary sells 1 one-off in-app purchase. Otasuke Kototen asks for nothing beyond the download.

3sec Diary ships an update every 26 months, Otasuke Kototen every 3 weeks. The most recent releases landed on October 21, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | 3sec Diary | Otasuke Kototen |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 26 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 12 MB | 61 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [KENJI KANEMOTO](https://appshunter.io/developer/402720982) | [SOCIA LABO, K.K.](https://appshunter.io/developer/1688326248) |

## What reviewers say

### 3sec Diary

[App page](https://appshunter.io/ios/app/3sec-diary/id985967203)

Quickly log daily activities and feelings in just three seconds. Your entries are securely stored in your iPhone Calendar, ensuring data safety and easy access. This tool helps you preserve memories and makes research and sharing effortless.

**Highlights:** 3-second daily logging, Calendar integration, Secure data storage, Easy research and sharing, Memory preservation

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Eliminate Ads | $0.99 | one-time |


### Otasuke Kototen

[App page](https://appshunter.io/ios/app/otasuke-kototen/id1601102019)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 3sec Diary free?

3sec Diary is free to download, with in-app purchases available.

### Is Otasuke Kototen free?

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

### Do 3sec Diary or Otasuke Kototen have ads?

Both 3sec Diary and Otasuke Kototen show ads.

### Which is updated more often, 3sec Diary or Otasuke Kototen?

3sec Diary ships an update every 26 months, and Otasuke Kototen every 3 weeks. Most recently, 3sec Diary was updated on October 21, 2026 and Otasuke Kototen on October 11, 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.*