# KeyHub vs Correctbook App

The clearest difference is update cadence: KeyHub at every 3 months against Correctbook App's every 9 months. KeyHub also leads on device support (3 vs 1) and iOS requirement (13.0 vs 16.0). On price, ads and in-app purchases there is nothing between them.

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

KeyHub ships an update every 3 months, Correctbook App every 9 months. The most recent releases landed on September 14, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | KeyHub | Correctbook App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 9 months |
| Size | 7 MB | 30 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Topicus Onderwijs B.V.](https://appshunter.io/developer/517215699) | [Correctbook](https://appshunter.io/developer/1691849771) |

## What reviewers say

### KeyHub

[App page](https://appshunter.io/ios/app/keyhub/id1024961560)

**Features:** macOS Compatibility

**In-app purchases:** none


### Correctbook App

[App page](https://appshunter.io/ios/app/correctbook-app/id6450104369)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is KeyHub free?

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

### Is Correctbook App free?

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

### Do KeyHub or Correctbook App have ads?

Neither KeyHub nor Correctbook App shows ads.

### Which is updated more often, KeyHub or Correctbook App?

KeyHub ships an update every 3 months, and Correctbook App every 9 months. Most recently, KeyHub was updated on September 14, 2026 and Correctbook App on September 11, 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.*