# Coef vs Bookbench

The clearest difference is in-app purchases: Coef at none against Bookbench's 1. Coef also leads on iOS requirement (16.4 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Bookbench sells 1 in-app purchase, starting at $9.99 per month. Coef asks for nothing beyond the download.

## The numbers

| Metric | Coef | Bookbench |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 days | — |
| Size | 100 MB | 20 MB |
| Requires iOS | **16.4** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Noe Guerin](https://appshunter.io/developer/6801919207) | [Denys Kotelnykov](https://appshunter.io/developer/1411971147) |

## What reviewers say

### Coef

[App page](https://appshunter.io/ios/app/coef/id6805438755)

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

**In-app purchases:** none


### Bookbench

[App page](https://appshunter.io/ios/app/bookbench-ai-book-notes/id6813968634)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $9.99 | per month |


## Frequently asked questions

### Is Coef free?

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

### Is Bookbench free?

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

### Do Coef or Bookbench have ads?

Neither Coef nor Bookbench shows ads.

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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.*