Our verdict: Koodo Reader is a clean, modern reader for DRM-free e-books with an unlimited library on desktop. Syncing between devices, cloud import and the translation, dictionary and AI tools now belong to the paid Pro plan.
About Koodo Reader
Koodo Reader is an open-source e-book reader licensed under the GNU AGPL v3. It reads more than 15 formats, including EPUB, PDF, MOBI, AZW3, TXT and CBZ/CBR comic books, and offers single-column, two-column and continuous scroll layouts with adjustable fonts, spacing, margins, colors and night mode.
You can add bookmarks, highlights and notes and organize books on shelves. The free version has no limit on the number of books on desktop. Koodo Reader Pro, $4.99 per year, adds sync across devices through cloud storage or WebDAV, importing books from cloud services, official translation and dictionary, AI reading assistance, natural text-to-speech voices and OCR for scanned PDFs.
What it does well
- 15+ formats. EPUB, PDF, MOBI, AZW3, TXT, FB2 and comic book archives.
- Flexible layouts. Single page, two columns or continuous scroll, with font, spacing and color controls.
- Notes and highlights. Bookmarks, highlights, notes and text styling, organized per book.
- Shelves. Sort the library into shelves and batch-import whole folders.
- Pro sync (paid). Pro syncs books, progress and notes via OneDrive, Google Drive, Dropbox, WebDAV and more.
Who it is for
Good fit
Readers with a DRM-free EPUB, PDF or MOBI collection who want a modern reading app on the PC.
Look elsewhere
People who need free sync between devices or who read DRM-protected store and library books.
Pros and cons
Pros
- Open source with an unlimited desktop library
- Many e-book and comic formats
- Modern interface with themes and layouts
- Portable version available
Cons
- Device sync and cloud import require the paid Pro plan
- No support for DRM-protected books
How to install Koodo Reader
Download the x64 installer from the latest GitHub release linked on the official download page; a portable EXE and ZIP are also offered. Import books by dragging files into the window. Sync and the online translation, dictionary and AI tools need a Pro subscription; the 7-day trial is optional.
Questions about Koodo Reader
Is Koodo Reader free?
Yes. The app is open source and free with unlimited books on desktop. Pro costs $4.99 per year and adds sync, cloud import and online services.
Can Koodo Reader open Kindle books?
It opens DRM-free MOBI and AZW3 files, but not Kindle books protected with Amazon DRM.
Does the free version sync between devices?
No. Syncing the library, progress and notes across devices is part of Koodo Reader Pro.
