# Correctbook App vs Volunteer

The clearest difference is update cadence: Volunteer at every 3 weeks against Correctbook App's every 9 months. On price, ads, 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.

Correctbook App ships an update every 9 months, Volunteer every 3 weeks. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Correctbook App | Volunteer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Size | 30 MB | 17 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Correctbook](https://appshunter.io/developer/1691849771) | [Erik Jaen Fledderus](https://appshunter.io/developer/1822161858) |

## What reviewers say

### Correctbook App

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

**Features:** Vision Pro support

**In-app purchases:** none


### Volunteer

[App page](https://appshunter.io/ios/app/volunteer/id6752023492)

**In-app purchases:** none


## Frequently asked questions

### Is Correctbook App free?

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

### Is Volunteer free?

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

### Do Correctbook App or Volunteer have ads?

Neither Correctbook App nor Volunteer shows ads.

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

Correctbook App ships an update every 9 months, and Volunteer every 3 weeks. Most recently, Correctbook App was updated on October 25, 2026 and Volunteer on October 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.*