Comparison

Thorium Reader vs Duri

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

Duri

This app reads your EPUBs, PDFs, comics, and text files with realistic page-turning animations. It offers text-to-speech, note-taking, highlighting, and PDF annotation features. Your data stays on your device, and Pro features are available via a one-time purchase.

Highlights
  • Realistic page-turning animations
  • Text-to-speech with multiple voices
  • Highlighting and note-taking
  • PDF annotation tools
  • Customizable reading themes and fonts
  • iCloud sync for Pro users
  • Widgets and Apple Watch remote
Features
Read full description

Duri is a reader for the books and documents you already have: EPUBs, PDFs and the scans of them, comics, plain text and Markdown, and articles saved from the web. It turns their pages like a book, remembers where you stopped, and keeps your highlights and notes where you can find them. PAGES THAT TURN LIKE PAPER A real page curl that follows your finger, the back of the leaf showing through, on every kind of file. On an iPad on its side the book lies open as a two-page spread, with the spine down the middle and a double-page comic panel across both. MADE TO BE READ FOR HOURS Four themes free and ten more with Pro, among them an E-ink theme that stops every animation. Five reading faces, and your own fonts with Pro. Line spacing and margins, a page you can pinch. Footnotes open where you are. READS ALOUD Any book, any document, even a scanned PDF, whose words Duri recognises on your phone. Press Listen and the voice begins within a second or two, from the page you are on or from any sentence you choose, and follows you when you turn the page. A listening view like lyrics, lit word by word, in a voice of Duri's own that runs on your phone: four to choose from, and nothing you read leaves the device. Ten minutes a day are free. YOUR NOTES STAY YOURS Highlight in five colours, write notes (typed or by hand), copy with a citation, make a quote card (Pro). Draw on a PDF with a pen, a highlighter and an eraser, and share the PDF with your marks in it. Export everything as Markdown or plain text, always, for free. AWAY FROM THE APP Widgets for the book you're reading, what's playing and your daily reading goal. A listening remote on your Apple Watch. Save a page from Safari's share sheet and it's an article in your library. Follow a site and new pieces arrive by themselves. On an iPad, read a book beside its translation. ON IPHONE DUO Open, a book lies across both screens with its spine on the fold, and the library and contents use both pages. Half folded, the page stands above the fold with the controls below, so it reads on a table by itself. HONEST ABOUT WHAT IT CAN'T DO Books locked to another store (Kindle, Apple Books) can't be opened here, and Duri says so rather than pretending. NOTHING ABOUT YOU LEAVES YOUR DEVICE No servers of ours. A book from a catalogue or a page you save comes straight from where it lives, and sync, if you want it, goes through your own iCloud and nowhere else. DURI PRO One purchase, once, shared with your family: unlimited listening, iCloud sync, ten more themes and five accents, your own fonts, quote cards and PDF export of your notes. It costs US$9.99 (the App Store shows the price in your country), is paid once and never renews: it is not a subscription. Everything else is free, and stays free. Terms of use: https://duri.neeraj.ca/terms.html Privacy policy: https://duri.neeraj.ca/privacy.html

Screenshots

Thorium Reader4 screens
Duri4 screens

Verdict

The call

The clearest difference is rating: Duri at 5.0 against Thorium Reader's 3.5. Duri also leads on update cadence (daily vs every 3 weeks). Thorium Reader's advantage is in-app purchases (none vs 1) and ratings volume (13 vs 1). On price, ads, device support and iOS requirement 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. Duri sells 1 one-off in-app purchase. Thorium Reader asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Duri holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: Thorium Reader has 13 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Thorium Reader ships an update every 3 weeks, Duri daily. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 5 level
Thorium Reader versus Duri: the parameters behind the verdict, then further details
ParameterThorium ReaderDuri
PriceFreeFree
Rating3.5 (13 ratings)5.0 (1 ratings) — better
Positive reviews40.0% of reviews—
Number of ratings13 — better1
Update frequencyEvery 3 weeksDaily — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPadiPhone, iPad, Apple Watch — better
Requires iOS26.126.0 — better
Further details — not scored
Size46 MB247 MB
Age rating17+4+
DeveloperReadiumNEERAJ SHARMA

In-app purchases

None

Thorium Reader

No in-app purchases

1 purchases

Duri

One-time1
  • Duri Pro$9.99

Questions

Is Thorium Reader free?
Thorium Reader is free to download, with no in-app purchases.
Is Duri free?
Duri is free to download, with in-app purchases available.
Which has better reviews, Thorium Reader or Duri?
Duri is rated higher. Thorium Reader averages 3.5 out of 5 from 13 ratings, while Duri averages 5.0 from 1 ratings.
Do Thorium Reader or Duri have ads?
Neither Thorium Reader nor Duri shows ads.
Which is updated more often, Thorium Reader or Duri?
Thorium Reader ships an update every 3 weeks, and Duri daily. Most recently, Thorium Reader was updated on November 8, 2026 and Duri on October 31, 2026.

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