# O vs postalk

The clearest difference is in-app purchases: O at none against postalk's 2. O also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. postalk sells 2 in-app purchases, starting at $5.99 per month. O asks for nothing beyond the download.

O ships an update every 3 weeks, postalk monthly. The most recent releases landed on September 8, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | O | postalk |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Monthly |
| Size | 3 MB | 90 MB |
| Requires iOS | **15.5** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [O-TECH JAPAN](https://appshunter.io/developer/1219186631) | [postalk株式会社](https://appshunter.io/developer/1660710551) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-tech-shift/id1645042734)

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

**In-app purchases:** none


### postalk

[App page](https://appshunter.io/ios/app/postalk/id1660710549)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 使い放題プラン | $5.99 | per month |
| 年額8,980円 | $59.99 | per year |


## Frequently asked questions

### Is O free?

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

### Is postalk free?

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

### Do O or postalk have ads?

postalk shows ads; O does not.

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

O ships an update every 3 weeks, and postalk monthly. Most recently, O was updated on September 8, 2026 and postalk on September 9, 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.*