# ClassBook Pro vs Retent

The clearest difference is iOS requirement: Retent at 15.0 against ClassBook Pro's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. ClassBook Pro sells 3 in-app purchases, starting at $2.99 per month and Retent sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

ClassBook Pro ships an update weekly, Retent every 8 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | ClassBook Pro | Retent |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 8 days |
| Size | 26 MB | 27 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 17+ | 9+ |
| Developer | [Javier Dosque](https://appshunter.io/developer/1812960402) | [Kristiyan Grigorov](https://appshunter.io/developer/1885305370) |

## What reviewers say

### ClassBook Pro

[App page](https://appshunter.io/ios/app/classbook-pro-teacher-grades/id6746811124)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $2.99 | per month |
| Suscripción Anual Libro de clases | $9.99 | per year |
| Lifetime Access | $34.99 | one-time |


### Retent

[App page](https://appshunter.io/ios/app/retent-learn-and-remember/id6760609613)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Retent Unlimited Monthly | $6.99 | per month |
| Retent Unlimited Yearly | $39.99 | per year |


## Frequently asked questions

### Is ClassBook Pro free?

ClassBook Pro is free to download, with in-app purchases available.

### Is Retent free?

Retent is free to download, with in-app purchases available.

### Do ClassBook Pro or Retent have ads?

Neither ClassBook Pro nor Retent shows ads.

### Which is updated more often, ClassBook Pro or Retent?

ClassBook Pro ships an update weekly, and Retent every 8 days. Most recently, ClassBook Pro was updated on October 24, 2026 and Retent on October 24, 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.*