# mBooks vs Grim Reader

The clearest difference is iOS requirement: mBooks at 13.0 against Grim Reader's 17.0. On price, update cadence, 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.

mBooks ships an update every 9 days, Grim Reader weekly. The most recent releases landed on October 25, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | mBooks | Grim Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/grim-reader/id6782366876/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 days | **Weekly** |
| Monetization | — | Free |
| Size | 65 MB | 18 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Anshika Maurya](https://appshunter.io/developer/1787701644) | [Maarten de Kreij](https://appshunter.io/developer/6774006735) |

## What reviewers say

### mBooks

[App page](https://appshunter.io/ios/app/mbooks-pdf-and-epub-reader/id6774751313)

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

**In-app purchases:** none


### Grim Reader

[App page](https://appshunter.io/ios/app/grim-reader/id6782366876)

Organize and enrich your personal library of e-books, comics, and audiobooks. This app allows you to manage your collection locally or via your own servers, adding details like covers and author information. Enjoy a seamless reading and listening experience across all your content.

**Highlights:** Library management for e-books, comics, and audiobooks, Enrich library with online book and author data, Supports local files and personal servers (WebDAV, OPDS), Cross-device reading and listening progress tracking, Organize by author, series, and genre, Mark favorites

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

**In-app purchases:** none


## Frequently asked questions

### Is mBooks free?

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

### Is Grim Reader free?

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

### Do mBooks or Grim Reader have ads?

Neither mBooks nor Grim Reader shows ads.

### Which is updated more often, mBooks or Grim Reader?

mBooks ships an update every 9 days, and Grim Reader weekly. Most recently, mBooks was updated on October 25, 2026 and Grim Reader on November 5, 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.*