# Common Errors in English vs O

The clearest difference is ads: Common Errors in English at none against O's shown. Common Errors in English also leads on iOS requirement (7.1 vs 15.6). On price, update cadence, in-app purchases and device support there is nothing between them.

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

Common Errors in English ships an update every 6 months, O every 8 months. The most recent releases landed on October 8, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Common Errors in English | O |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 6 months** | Every 8 months |
| Size | 9 MB | 26 MB |
| Requires iOS | **7.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [rahul baweja](https://appshunter.io/developer/804610215) | [Albert Mungochi](https://appshunter.io/developer/1724993311) |

## What reviewers say

### Common Errors in English

[App page](https://appshunter.io/ios/app/common-errors-in-english/id1090750942)

**Features:** macOS Compatibility

**In-app purchases:** none


### O

[App page](https://appshunter.io/ios/app/o-level-physics-revision/id6740166171)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Common Errors in English free?

Common Errors in English is free to download, with no in-app purchases.

### Is O free?

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

### Do Common Errors in English or O have ads?

O shows ads; Common Errors in English does not.

### Which is updated more often, Common Errors in English or O?

Common Errors in English ships an update every 6 months, and O every 8 months. Most recently, Common Errors in English was updated on October 8, 2026 and O on September 30, 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.*