# Shared Diary vs Tensei Algorithm

The clearest difference is in-app purchases: Tensei Algorithm at none against Shared Diary's 1. Tensei Algorithm also leads on update cadence (every 5 days vs fortnightly). Shared Diary's advantage is iOS requirement (16.0 vs 26.2). On price, ads and device support there is nothing between them.

Both are free to download. Shared Diary sells 1 in-app purchase, starting at $2.99 per month. Tensei Algorithm asks for nothing beyond the download.

Shared Diary ships an update fortnightly, Tensei Algorithm every 5 days. The most recent releases landed on September 24, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Shared Diary | Tensei Algorithm |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Fortnightly | **Every 5 days** |
| Size | 41 MB | 29 MB |
| Requires iOS | **16.0** | 26.2 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Originate Aster, Inc.](https://appshunter.io/developer/1722580451) | [KAORU IMAI](https://appshunter.io/developer/1890363790) |

## What reviewers say

### Shared Diary

[App page](https://appshunter.io/ios/app/shared-diary/id6741321954)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Proプラン(1か月間) | $2.99 | per month |


### Tensei Algorithm

[App page](https://appshunter.io/ios/app/tensei-algorithm/id6761587481)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Shared Diary free?

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

### Is Tensei Algorithm free?

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

### Do Shared Diary or Tensei Algorithm have ads?

Both Shared Diary and Tensei Algorithm show ads.

### Which is updated more often, Shared Diary or Tensei Algorithm?

Shared Diary ships an update fortnightly, and Tensei Algorithm every 5 days. Most recently, Shared Diary was updated on September 24, 2026 and Tensei Algorithm on September 21, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*