# Concrefy vs Correctbook App

The clearest difference is update cadence: Correctbook App at every 9 months against Concrefy's every 23 months. Concrefy's advantage is iOS requirement (12.0 vs 16.0). 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.

Concrefy ships an update every 23 months, Correctbook App every 9 months. The most recent releases landed on October 7, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Concrefy | Correctbook App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 9 months** |
| Size | 20 MB | 30 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Concrefy Bv](https://appshunter.io/developer/1513163302) | [Correctbook](https://appshunter.io/developer/1691849771) |

## What reviewers say

### Concrefy

[App page](https://appshunter.io/ios/app/concrefy/id1513163303)

**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 Concrefy free?

Concrefy 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 Concrefy or Correctbook App have ads?

Neither Concrefy nor Correctbook App shows ads.

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

Concrefy ships an update every 23 months, and Correctbook App every 9 months. Most recently, Concrefy was updated on October 7, 2026 and Correctbook App 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.*