# O vs One

The clearest difference is ads: O at none against One's shown. O also leads on device support (3 vs 1). One's advantage is update cadence (every 3 days vs every 3 weeks). On price, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

O ships an update every 3 weeks, One every 3 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | O | One |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Size | 3 MB | 92 MB |
| Requires iOS | **15.5** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [O-TECH JAPAN](https://appshunter.io/developer/1219186631) | [Koji Shimizu](https://appshunter.io/developer/1567018686) |

## 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


### One

[App page](https://appshunter.io/ios/app/one-tap-shifts/id6468992299)

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

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is One free?

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

### Do O or One have ads?

One shows ads; O does not.

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

O ships an update every 3 weeks, and One every 3 days. Most recently, O was updated on October 25, 2026 and One 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.*