Calibre ebook reader vs GemReader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calibre ebook reader
Seamlessly sync your Calibre ebook library wirelessly to your iPhone. Convert various ebook formats to EPUB directly within the app and customize your reading experience with adjustable fonts, themes, and spacing. Listen to your books with text-to-speech functionality.
- Wireless Calibre library sync
- Built-in ebook converter (PDF, MOBI, AZW, etc. to EPUB)
- Customizable reading experience (fonts, themes)
- Text-to-speech audiobook functionality
- Import from cloud storage (Files, Dropbox, iCloud)
- Organize library by author, series, collection
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Pageo is a Calibre companion app for iPhone and iPad: a Calibre ebook reader that syncs your library over Wi-Fi in both directions, converts any ebook to EPUB and reads your books aloud in 31 languages. It connects directly to the Content Server built into Calibre — no cables, no account, no hassle. ▶ TWO-WAY CALIBRE SYNC Turn on the Content Server in Calibre (Mac, Windows or Linux) and Pageo finds it on your local network, or connect by address. Books come to your iPhone or iPad — and your reading position, finished books, ratings and highlights go back to your computer, into Calibre's own annotations. Download one book or the whole library in a tap. ▶ ALL YOUR CALIBRE LIBRARIES — EVEN WITH YOUR COMPUTER OFF Multiple Calibre libraries: browse one at a time or all at once, with separate progress for every book. Or open a Calibre library folder straight from iCloud, Dropbox or this device — no server needed. ▶ PICK UP WHERE YOU LEFT OFF With Pageo Pro, your place, bookmarks and highlights follow you between iPhone and iPad through iCloud — with or without Calibre. Just add the same book on each device. ▶ BUILT FOR CALIBRE POWER USERS Table view puts the columns you built in Calibre into a desktop-style layout — sort by any column, pin titles, jump with the A–Z rail. Search your whole library with Calibre's own search syntax, or search inside every book, even ones you haven't downloaded yet. Series, tags and the author sort you set in Calibre carry over. ▶ CONVERT ANY EBOOK PDF, MOBI, AZW, AZW3, FB2 and CBZ/CBR comics become clean EPUBs right on your device — no desktop, no extra apps. A PDF's footnotes move to the end of the chapter, a tap away from their number. Anything Pageo can't convert itself, it hands to your Calibre server. Share a web page from Safari and it becomes a clean EPUB on your shelf. ▶ READ YOUR WAY Any iOS typeface or reading aids like OpenDyslexic, Atkinson Hyperlegible and Lexend. Focus Text, word spacing and hyphenation in your book's own language. Text up to 400%, six line-spacing and six margin settings. Light, dark and sepia themes, page or scroll mode, page curl or instant turns, right-to-left languages. Tap a picture to see it full screen and zoom in. Highlights, notes and bookmarks — export your annotations to a single file. Pageo remembers your place in every book. ▶ LISTEN TO YOUR BOOKS Turn any ebook into an audiobook with built-in read-aloud: ten lifelike voices, 31 languages, fully offline after a single download. The page follows the voice, and every language gets a natural pace. ▶ FIND ANYTHING FAST Search inside the book you're reading or across your whole library. Your books, chapters, highlights and bookmarks show up in Spotlight, and Siri Shortcuts let you say "Continue reading in Pageo" or "Listen to my book in Pageo". Home Screen widgets keep your current book and reading streak in view. ▶ YOUR LIBRARY, YOUR CONTROL Import from Files, Dropbox, OneDrive or iCloud Drive. Organize by author, series, tags or collection. Nothing to read yet? The Discover tab offers free public-domain classics from Project Gutenberg in many languages. Your books stay on your device — no account, no lock-in. ▶ FREE WITH OPTIONAL PRO UPGRADE Pageo is free to use with ads. Pageo Pro unlocks read-aloud, the converters and iCloud sync, and removes ads. Try Pro free for 3 days. ▶ COMMON QUESTIONS Does Pageo work with Calibre? Yes — with the Content Server built into Calibre on Mac, Windows and Linux. No plugin or connector to install. Does my reading sync between iPhone and iPad? Yes — through iCloud with Pageo Pro, or through Calibre. Does my computer need to be on? For server sync, yes. For a library folder in iCloud or Dropbox, no. Does reading progress sync back to Calibre? Yes — position, finished status, ratings and highlights. Do I need an account? No. Terms of Use (EULA): https://visioncraft.es/pageo-terms Privacy Policy: https://visioncraft.es/pageo-privacy-policy
GemReader
This app is designed for learning through reading, allowing users to save form answers, highlights, notes, and flashcards within EPUB and PDF files. It offers study tools like flashcard creation and spaced repetition, with an encrypted, offline-first library and text-to-speech functionality.
- Save form answers in interactive ebooks
- Highlighting with 6 colors and notes
- Create flashcards from highlights
- Spaced repetition review deck
- Offline EPUB and PDF reading
- Encrypted library with optional backups
- Text-to-speech for books
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GemReader is an offline EPUB and PDF reader that saves everything you do inside a book — your form answers, highlights, notes, and flashcards. Built for people who read to learn, not just to finish. No account. No tracking. Your library is encrypted on your device, and backups are optional. YOUR FORM ANSWERS ARE SAVED Most ebook readers throw away what you type. GemReader doesn't. Fill in a workbook exercise, close the book, come back a week later — your answers are exactly where you left them. Every text field, checkbox, dropdown, and radio button in an interactive EPUB is saved automatically. HIGHLIGHT AND ANNOTATE Highlight passages in six colors and attach a note to any highlight. Add standalone text notes, bookmarks, and notes pinned to images. Notes support Markdown. Tag anything you keep, name the highlight colors yourself, and see every highlight and note from your whole library in one searchable list. Keep PIN-locked notebooks, and store videos, diagrams and photos encrypted beside your books. STUDY TOOLS BUILT IN Look up any word in the in-book dictionary without leaving the page. Turn your highlights into flashcards and drill them with the built-in spaced repetition review deck. Export annotations to Anki, or import your existing .apkg and .txt decks straight into the app. FREE BOOKS TO START WITH Browse Project Gutenberg, Standard Ebooks and other open catalogs from inside the app and download straight into your library. Add any OPDS catalog you trust. Downloads are encrypted on arrival, like every other book. LISTEN TO YOUR BOOKS A neural text-to-speech voice reads any book aloud, generated entirely on your device — no cloud, no account, and no connection needed once the voice is installed. Books that ship with their own chapter audio play that instead, with lock-screen playback controls. PDF READER INCLUDED Open PDFs alongside your EPUBs. Fixed-layout rendering, working links and form fields, pinch-to-zoom, full-text search, and dark mode. ENCRYPTED LIBRARY Your books are encrypted at rest with AES-256-GCM. No plaintext file ever touches disk. Lock individual collections behind their own key, and lock the whole app with Face ID or a PIN when you put it down. Your books stay yours. BUILT FOR OFFLINE READING Everything works with the network off. No account is required, and nothing is uploaded unless you turn on encrypted backup to your own Google Drive. ORGANIZE A REAL LIBRARY Grid and list views, nested collections with custom colors, cover art, full-text search across your library, table of contents, footnotes, image zoom, and reading history so you can jump back to where you were three chapters ago. MADE COMFORTABLE TO READ Light, dark, sepia, and high-contrast Ultra themes. Adjustable fonts, margins, and layout. Immersive full-screen reading. Tablet support on iPad. Interface available in 18 languages: English, Spanish, Portuguese, Hindi, Indonesian, French, German, Russian, Arabic, Chinese, Japanese, Korean, Burmese, Khmer, Amharic, Turkish, Vietnamese, and Thai. SHARE WITHOUT THE CLOUD Gem Beam hands a book, or a whole collection, to the phone next to you directly, device to device — no internet, no account, nothing leaving the room. Highlights, notes, reading position and study progress travel with them. You can also export a book as an encrypted .gem pack, optionally as a scannable QR code, or turn a favorite passage into a shareable quote card image. WHO IT'S FOR • Students working through interactive textbooks, workbooks, and study guides • Language learners who need a dictionary, flashcards, and audio in one place • Researchers and professionals who annotate heavily and need it to stay put • Anyone who wants a private, offline ebook reader with no account attached GemReader reads DRM-free EPUB, PDF, MOBI, AZW3, FB2, CBZ and TXT files. Import from your device, share into the app, or download from the catalogs above. Note: iOS doesn't let apps block screenshots or screen recording.
Screenshots
Verdict
The clearest difference is in-app purchases: GemReader at none against Calibre ebook reader's 4. GemReader also leads on ads (none vs shown) and rating (5.0 vs 4.6). Calibre ebook reader's advantage is ratings volume (19 vs 1). 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. Calibre ebook reader sells 4 in-app purchases, starting at $4.99 per month. GemReader asks for nothing beyond the download.
GemReader holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Calibre ebook reader has 19 ratings behind it against 1, so its average is the more settled of the two.
Calibre ebook reader ships an update every 9 days, GemReader every 2 days. The most recent releases landed on November 9, 2026 and November 12, 2026 respectively.
| Parameter | Calibre ebook reader | GemReader |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (19 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 60.0% of reviews | — |
| Number of ratings | 19 — better | 1 |
| Update frequency | Every 9 days | Every 2 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 | 18.0 |
| Further details — not scored | ||
| Size | 88 MB | 87 MB |
| Age rating | 4+ | 4+ |
| Developer | VISIONCRAFT, SOCIEDAD LIMITADA | Johan Christopher Nohall |
Customer experience
Calibre ebook reader
GemReader
In-app purchases
Calibre ebook reader
- Pageo Pro3 Days trial$4.991 Month
- Pageo Pro$4.991 Month
- Pageo Pro3 Days trial$19.991 Year
- 1 Day of Pro$0.99
GemReader
No in-app purchases
Questions
Is Calibre ebook reader free?
Is GemReader free?
Which has better reviews, Calibre ebook reader or GemReader?
Do Calibre ebook reader or GemReader have ads?
Which is updated more often, Calibre ebook reader or GemReader?
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