Comparison

mBooks vs Grim Reader

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

mBooks

Features
Read full description

A minimal, focused reader for your PDF and EPUB books. mBooks keeps reading clean and puts your highlights first. Select any passage, highlight it in the color you choose, and your highlights stay safe — they sync to your account and reappear on every device, even after you sign out and back in. Features: • PDF and EPUB support: Read your entire library in one simple app. • Cloud-Synced Highlights: Never lose a note. Highlights sync to your account and reappear on any device. • Offline First: Read and highlight anywhere. Sync automatically when you reconnect. • Minimalist Design: A clean interface focused entirely on your reading. • Custom Colors: Choose your preferred highlight color to personalize your experience. • Privacy: Your book files stay on your device. Only your highlights are synced to your private account. • Focused reading: A quiet reader experience built around your books and highlights. Import a PDF or EPUB and start reading with mBooks.

About

Grim Reader

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
Read full description

Your books. Your library. Your way. Privacy By Design. Made in the EU. Grim Reader is a modern reader and library manager for e-books, comics and audiobooks. Keep your collection on your device, connect to your own servers, and turn even a simple collection of files into a rich, beautifully organised library. A library that feels alive Browse your collection by books, authors, series and more. See covers, reading progress and detailed information at a glance, continue where you left off, mark favourites and quickly find what you want to read next. Grim Reader is designed for both iPhone and iPad, with an interface that adapts to the device you are using. Enrich your books Missing a cover, description or other information? Grim Reader can help enrich your library using online book and author sources. Depending on the available information, Grim Reader can help you find and add details such as: • Covers and book descriptions • Authors and author information • Series information • Publisher and publication details • ISBN and other identifiers • Genres, categories and tags • Additional book metadata You remain in control and can review and edit your library information. More than e-books Grim Reader brings different types of reading together in one library: • Read e-books • Browse and read comics • Listen to audiobooks • Keep track of reading progress • Continue reading or listening across your library • Organise books by author and series • Mark books and authors as favourites Your files, your servers You don’t need to hand your library over to a commercial book platform. Grim Reader can work with books stored locally and supports personal libraries through WebDAV and OPDS, as well as the optional Grimmory server. This makes Grim Reader equally useful for a small collection on your iPhone or iPad and for a large self-hosted library. Made for readers Grim Reader focuses on your books rather than a store. There are no books to sell you and no ecosystem you need to buy into. Build the library you want, enrich it, organise it and enjoy reading it. Grim Reader — your library belongs to you.

Screenshots

mBooks3 screens
Grim Reader3 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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

Scorecard1 real difference · 8 level
mBooks versus Grim Reader: the parameters behind the verdict, then further details
ParametermBooksGrim Reader
PriceFreeFree
Rating—5.0 (4 ratings) — better
Number of ratings—4 — better
Update frequencyEvery 9 daysWeekly — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size65 MB18 MB
Age rating12+4+
DeveloperAnshika MauryaMaarten de Kreij

In-app purchases

None

mBooks

No in-app purchases

None

Grim Reader

No in-app purchases

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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