Thorium Reader vs COBISS Plus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Thorium Reader
Organize all your ebooks, comics, and manga in a single app. Customize your reading experience with adjustable text, fonts, and themes. Listen to audiobooks and zoom into visual content with ease.
- Unified bookshelf for all content
- Adjustable text size and spacing
- Multiple font options
- Text-to-speech audio playback
- Zoom for comics and manga
- Offline dictionary and translation
- Import EPUB, PDF, CBZ files
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Looking for an app where you can bring all your ebooks, comics and manga in one place? That’s what we built Thorium Reader for. Read it your way Everyone’s different, that’s why we want you to be fully in control: • Adjust text size, switch between color schemes with themes and control spacing. • 10+ fonts available, including specialized ones. • You prefer audio? Listen to any ebook, whenever you want. We’ll remember your preference. • Zoom into comics, manga and magazines. • Add bookmarks with notes. • Use the built-in iOS dictionary and translation features, even offline. • Tweak your reading experience with reading options. Bring your own books A single bookshelf and reading application where you can bring all your content: • Download free books, borrow from your library or buy from your favorite retailer. • Support for ebooks, documents, comics and manga. • Import EPUB, PDF and CBZ files. • Support for Readium LCP, used by thousands of libraries and retailers. Thorium Reader is built by EDRLab, a non-profit dedicated to open standards, reading and accessibility.
COBISS Plus
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COBISS Plus is a mobile app that allows you to access and search the library catalogue, view information about materials and their availability for loan at libraries included in the COBISS system. The app also allows you to search specialised databases and university portals. In COBISS Plus, users who have created a COBISS account and added a library membership can: - reserve materials - borrow e-books and audiobooks - request materials for interlibrary loan and cancel such requests - view items checked out at their library and renew loan periods, cancel reservations, or return e-books early - renew their membership - view and pay outstanding fees - view their loan history Registered users can add records of interesting materials to their favourites or shelves, save search requests, set a default library for searching, set the number of search results displayed, specify the default library membership in their COBISS account, etc. Users who are not yet members of the library can also join the library.
Screenshots
Verdict
The clearest difference is update cadence: COBISS Plus at weekly against Thorium Reader's every 3 weeks. COBISS Plus also leads on iOS requirement (18.2 vs 26.1). On price, ads, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Thorium Reader ships an update every 3 weeks, COBISS Plus weekly. The most recent releases landed on October 13, 2026 and September 29, 2026 respectively.
| Parameter | Thorium Reader | COBISS Plus |
|---|---|---|
| Price | Free | Free |
| Rating | 3.6 (11 ratings) — better | — |
| Positive reviews | 37.5% of reviews | — |
| Number of ratings | 11 — better | — |
| Update frequency | Every 3 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.1 | 18.2 — better |
| Further details — not scored | ||
| Size | 46 MB | 33 MB |
| Age rating | 17+ | 9+ |
| Developer | Readium | IZUM |
In-app purchases
Thorium Reader
No in-app purchases
COBISS Plus
No in-app purchases
Questions
Is Thorium Reader free?
Is COBISS Plus free?
Do Thorium Reader or COBISS Plus have ads?
Which is updated more often, Thorium Reader or COBISS Plus?
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