# O vs Saisunkun

The clearest difference is in-app purchases: O at none against Saisunkun's 1. On price, update cadence, ads and device support there is nothing between them.

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

O ships an update every 3 weeks, Saisunkun every 2 weeks. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | O | Saisunkun |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 16 MB | 18 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [O-TECH JAPAN](https://appshunter.io/developer/1219186631) | [masafumi etoh](https://appshunter.io/developer/1689334069) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-techmobile/id1246072028)

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

**In-app purchases:** none


### Saisunkun

[App page](https://appshunter.io/ios/app/saisunkun/id6449476032)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Saisunkun premium 月額プラン | $2.99 | per month |


## Frequently asked questions

### Is O free?

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

### Is Saisunkun free?

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

### Do O or Saisunkun have ads?

Neither O nor Saisunkun shows ads.

### Which is updated more often, O or Saisunkun?

O ships an update every 3 weeks, and Saisunkun every 2 weeks. Most recently, O was updated on October 26, 2026 and Saisunkun on October 25, 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.*