Comparison

Duri vs purrpage. Double

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

Head to head
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

About

purrpage. Double

This app offers a serene reading experience for books, PDFs, and articles. It features customizable typography, a distraction-free interface, and a smart reading companion for explanations and summaries. Listen to your content with natural voices and follow along as sentences are highlighted.

Highlights
  • Customizable typography
  • Distraction-free reading
  • Organized library for books, PDFs, articles
  • AI reading companion for explanations and summaries
  • Text-to-speech with highlighting
  • Note-taking and highlighting
  • Two-page spread on compatible devices
Features
Read full description

Duo Reader is a quiet place to read. Your books, PDFs and articles live in one calm library, set in beautiful type, with a reading companion for when a page needs a second look. READ IN COMFORT - Typography first: choose your typeface, size, spacing and margins, and every line reflows instantly - Clean, distraction-free pages that let the words lead - Pick up exactly where you left off, every time YOUR LIBRARY, QUIETLY ORGANIZED - Books, PDFs and RSS articles in one place - Folders for studying, classics, or whatever you're reading next - Search across your books and jump straight to the passage UNDERSTAND WHAT YOU READ - Select any passage to explain, define, highlight or add a note - Translate a passage and read it alongside the original - Ask Mochi, your reading companion, to summarize a chapter without leaving the page LISTEN WHEN YOUR EYES NEED A REST - Natural voices in several languages, with adjustable speed - Follow along as each sentence is highlighted EVERYTHING YOU SAVE, IN ONE PLACE Bookmarks, notes and highlights, gathered and easy to revisit. EVEN BETTER ON IPHONE DUO Unfold iPhone Duo and your page opens into a true two-page spread. Translations, Mochi and your notes sit beside the page instead of on top of it. Fold it again mid-chapter, or mid-sentence while listening, and you're still on the same line. PRIVATE BY DESIGN Mochi answers quick questions on device, so your reading stays on your iPhone. Mochi features require a device that supports Apple Intelligence. --------------------- Privacy Policy: https://leostudio.global/policies Terms of Use: https://leostudio.global/policies For technical assistance or other inquiries: support@leostudio.global

Screenshots

Duri4 screens
purrpage. Double4 screens

Verdict

The call

The clearest difference is in-app purchases: purrpage. Double at none against Duri's 1. purrpage. Double also leads on ratings volume (3 vs 1) and iOS requirement (17.6 vs 26.0). Duri's advantage is ads (none vs shown) and update cadence (daily vs every 6 days). On price, rating 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Duri sells 1 one-off in-app purchase. purrpage. Double asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Duri against 5.0 for purrpage. Double. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

UpkeepUpdate frequency

Duri ships an update daily, purrpage. Double every 6 days. Both last shipped on November 10, 2026.

Scorecard6 real differences · 4 level
Duri versus purrpage. Double: the parameters behind the verdict, then further details
ParameterDuripurrpage. Double
PriceFreeFree
Rating5.0 (1 ratings)5.0 (3 ratings)
Positive reviews—100.0% of reviews
Number of ratings13 — better
Update frequencyDaily — betterEvery 6 days
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFreemiumAd-supported — better
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS26.017.6 — better
Further details — not scored
Size247 MB97 MB
Age rating4+4+
DeveloperNEERAJ SHARMALeoStudio Global

In-app purchases

1 purchases

Duri

One-time1
  • Duri Pro$9.99
None

purrpage. Double

No in-app purchases

Questions

Is Duri free?
Duri is free to download, with in-app purchases available.
Is purrpage. Double free?
purrpage. Double is free to download, with no in-app purchases.
Which has better reviews, Duri or purrpage. Double?
Duri and purrpage. Double are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.
Do Duri or purrpage. Double have ads?
purrpage. Double shows ads; Duri does not.
Which is updated more often, Duri or purrpage. Double?
Duri ships an update daily, and purrpage. Double every 6 days. Most recently, Duri was updated on November 10, 2026 and purrpage. Double on November 10, 2026.

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