Reader AI vs purrpage. Double
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Reader AI
This AI-powered reader helps you understand books by providing contextual word definitions, sentence explanations, and passage summaries. You can also chat with AI about the content, convert books to audiobooks, and save new vocabulary.
- Contextual word definitions
- AI sentence and passage explanations
- Book chat with AI
- Convert books to audiobooks
- Learning notebook for vocabulary
- Import various book formats
- PDF annotation
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Read books and web articles in their original language, with help when you need it. Reader AI brings reading, language learning and listening together. Import your own books or save an article from a link or the Safari share sheet, then read it in a layout you can make your own. READ AND UNDERSTAND Look up words in context and ask AI to explain sentences, expressions and passages. Set your native language and proficiency level for explanations that fit you. Ask questions about a book, follow answers back to cited passages, or get an AI summary of the whole book or what you have read so far. LISTEN AND FOLLOW ALONG Pro includes narration and translated subtitles. Follow the highlighted text while listening, change voices, or switch between the reader and player without losing your place. Free users can preview 45 seconds per book. Supported voices generate speech on your device after you download a voice pack; other available voices use online narration. In mainland China, narration is available only for languages supported on the device. PDFs with selectable text can be narrated too. BUILD YOUR LIBRARY Import EPUB, TXT, MOBI, AZW3, PDF and other supported formats. Keep books and articles together, or filter them separately. Browse your WebDAV library or OPDS catalog, search available titles and import what you want to read. Dropbox, OneDrive, Box, Google Drive imports and the Discover book catalog are available outside mainland China. Add books you come across to Want to Read and find them in your library sources later. Organize articles into folders. MAKE READING YOUR OWN Adjust fonts, spacing and colors, choose a page-turning effect, and use an external keyboard for reading and playback controls. Highlight passages, add notes, annotate PDFs and export them with annotations. Scanned PDFs need selectable text for word lookup. REMEMBER WHAT YOU READ Save words, expressions and sentences in Saved, along with their meanings and the original sentence. Review them, track your progress and return to the original passage. Pro also includes Book Chat, AI Summary and Similar Books. FREE READING AND PRO Reading, highlighting, notes and PDF annotation are free. The free library holds up to 3 books or articles in total. A one-time No bookshelf limit purchase or Pro removes this limit. Free AI credits let you try word lookup and explanations; Pro is required after they run out. Pro includes word lookup, explanations, pronunciation, Book Chat, AI Summary, Similar Books, narration and subtitle translation. Narration and subtitles no longer require separate credit purchases. Available subscription plans and prices are shown in the app. NO APP ACCOUNT REQUIRED Your library, reading progress and study data are primarily stored on your device and in your personal iCloud storage. AI features process the requested text and necessary context. Online narration sends text in segments to generate speech. Article text and images are extracted on your device. AI output may contain errors. Only import content you have the right to use. Requires iOS 18 or later. Payment is charged to your Apple Account when you confirm a purchase. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Manage or cancel subscriptions in your Apple Account settings and restore purchases in the app. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://reader.lorpaves.com/privacy/ Terms of Service: https://reader.lorpaves.com/terms/
purrpage. Double
Organize all your books, PDFs, and articles in a single, distraction-free library. Enhance comprehension with tools to explain, define, highlight, and translate passages. Listen to your content with natural-sounding voices and follow along as sentences are highlighted.
- Unified library for books, PDFs, and articles
- Customizable reading experience (typeface, size, spacing)
- Passage explanation, definition, and note-taking
- In-app translation
- AI reading companion for summaries
- Text-to-speech with adjustable speed
- Highlighting of current sentence during listening
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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
Verdict
The clearest difference is review sentiment: purrpage. Double at 100% against Reader AI's 0%. purrpage. Double also leads on in-app purchases (none vs 7). Reader AI's advantage is ads (none vs shown) and update cadence (every 5 days vs every 10 days). On price, 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
Both are free to download. Reader AI sells 7 in-app purchases, starting at $6.99 per month. purrpage. Double asks for nothing beyond the download.
Reader AI ships an update every 5 days, purrpage. Double every 10 days. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.
| Parameter | Reader AI | purrpage. Double |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 days — better | Every 10 days |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | Ad-supported — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 63 MB | 95 MB |
| Age rating | 12+ | 4+ |
| Developer | 江 刘 | LeoStudio Global |
Customer experience
Reader AI
purrpage. Double
In-app purchases
Reader AI
- Monthly$6.991 Month
- Quarterly$19.993 Months
- Yearly7 Days trial$69.991 Year
- 100 points$9.99
- No bookshelf limit$9.99
- 300 points$29.99
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- 1000 points$89.99
purrpage. Double
No in-app purchases









