CalibReader vs NextPhase Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CalibReader
This app offers a reading experience for EPUB and PDF files, featuring dual-page spreads and realistic page curls. It integrates with your existing calibre library and supports various cloud storage options. Enjoy a customizable reading environment and seamless syncing across devices.
- Dual-page spread and page curl effect
- Calibre library integration
- Cloud storage support (iCloud, Dropbox, OneDrive)
- Cross-device reading position sync
- Customizable themes and fonts
- Built-in dictionary
- PDF reader with two-page spreads
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Read your EPUBs like a real book: two pages side by side on iPad and iPhone Duo, with real page curls. PDFs open as two-page spreads too. Open your ebook files straight from Files, Safari, Mail or AirDrop, or bring your whole calibre library: CalibReader shelves them with covers and series, and keeps your place on every device. BUILT FOR IPHONE DUO Open iPhone Duo and your book becomes a two-page spread, with real page curls. Close it and the book closes: the cover screen shows its cover, leather-bound with the title in gold or the original art. Tap to keep reading, one page at a time. Your place holds through every fold, and turning the open phone to portrait gives you a single page. YOUR EPUB AND PDF FILES Any folder of EPUB or PDF files becomes a library with covers, sorting and search. WORKS WITH YOUR CALIBRE LIBRARY Point CalibReader at your calibre library folder and every book, cover, series, tag and synopsis appears as you organised it. Nothing to convert, no lock-in. YOUR STORAGE, YOUR CHOICE • A folder on your device or in iCloud Drive • Dropbox and OneDrive • Your own server or NAS over SMB • Other apps that share a folder in Files A READER BUILT FOR LONG SESSIONS • Two-page spread, single page or continuous scroll, with page curl or flip • Opens on a title page that turns over like a real one • Parchment, sepia, black and navy themes, or your own colour • Font, size, spacing, margins and justification, applied live • Table of contents, chapter navigation, clock and progress footer • Built-in dictionary • A PDF reader with two-page spreads on iPad and iPhone Duo that remembers your page PICK UP WHERE YOU LEFT OFF Reading positions and read status sync across your devices through a tiny file in your library folder. Put down the iPad, pick up the iPhone. A free calibre plugin writes read status, % read and last-read date back to your desktop library. A LIBRARY THAT LOOKS LIKE A LIBRARY Home with continue reading and recently added; grid, list and series views; filters and search; cover art found automatically when a book has none, and Choose Cover to swap in another edition's cover or bind any book in leather. 3 BOOKS FREE, THEN ONE PURCHASE Read any 3 books free, and bring in, sync and browse as many as you like. Then unlock your whole library with one purchase. No subscription, no account, no ads, no tracking, and no data collected. Formats: EPUB and PDF in the built-in reader; other formats open in the app of your choice. Note: CalibReader opens EPUB and PDF files without copy protection (DRM). Books bought in other apps' stores stay in those apps. CalibReader is an independent app, not affiliated with or endorsed by the calibre project. calibre is a trademark of Kovid Goyal. Support: hello@calibreader.com · https://calibreader.com
NextPhase Reader
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Read it. Listen to it. Learn from it. Listen instead of read. Turn your documents and compatible books into audio. NextPhase Reader brings reading, listening and language practice together on iPhone and iPad, using content you choose. LISTEN TO YOUR CONTENT • Read supported books and documents aloud using Apple device voices by default, with voice, speed and sleep-timer controls. Optional online voices are also available for live listening. • Listen to the original text, its translation, or both. • With Pro, prepare chapters or PDF pages as saved audio for offline playback. Export separate M4A recordings to Files or share them with another app. • Create saved audio with downloaded Kokoro voices, on your device with the app in the foreground. Apple device voices and online voices are for live listening; online voices require an internet connection. READ WHAT INTERESTS YOU • Import your own DRM-free EPUB, KEPUB, PDF, MOBI, AZW3, FB2, TXT, RTF, DOCX and HTML files. • Explore free classics through Project Gutenberg and Standard Ebooks, or connect a compatible OPDS library. • Adjust text size and reading layout, choose Light, Sepia or Dark, and keep highlights, notes and bookmarks. • Read text-based PDFs in their original layout or as flowing text. Scanned PDFs without selectable text are not supported for translation or speech. LEARN FROM YOUR READING Stay motivated. Read in the languages you want. Import content for side-by-side reading. • Read original and translated EPUB paragraphs together: side by side on wider screens, interleaved on narrow screens. • Save words in context and return to them with spaced-repetition review. • Use pronunciation guides for supported languages, including pinyin, furigana and romaja. • With Pro, highlight saved words as they reappear, export vocabulary as CSV, and export compatible books as bilingual EPUBs. Your first vocabulary CSV export is free. TRANSLATION CHOICES Built-in online translation needs no API key. Apple on-device translation requires a supported device, OS and downloaded language pair; unavailable language packs may lead to an online fallback. You can also use your own DeepL, OpenAI, Google Cloud or Azure key. Provider availability and quality vary by language. Completed translations are cached for reuse. PRO: ONE-TIME PURCHASE Choose one book to try Pro features free. Unlock Pro for all your books with a one-time in-app purchase for major version 1. No subscription. Pro includes natural voice downloads, saved audio, bilingual EPUB export and vocabulary export. Family Sharing is supported. Restore purchases is available in Settings. YOUR CONTENT, YOUR CHOICES Core reading works without an account. Your library is stored locally. Online translation and speech send relevant text to the selected services; optional account sync uploads reading data. Downloaded voices and saved audio support offline listening, but online services and new downloads require a connection. Compatible, DRM-free content only. Audio exports are separate chapter or page recordings, not a single combined audiobook. Interface available in English and Spanish.
Screenshots
Verdict
The clearest difference is chart position: CalibReader at #174 against NextPhase Reader's unranked. NextPhase Reader's advantage is iOS requirement (17.0 vs 26.2). 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. CalibReader sells 1 one-off in-app purchase and NextPhase Reader sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
| Parameter | CalibReader | NextPhase Reader |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (6 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 3 days | — |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Best chart rank | #174 — better | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.2 | 17.0 — better |
| Further details — not scored | ||
| Size | 49 MB | 90 MB |
| Age rating | 4+ | 12+ |
| Developer | Gram 1 | NextPhase LLC |
In-app purchases
CalibReader
- Unlock All Books Forever$9.99
NextPhase Reader
- NextPhase Reader Pro$29.99









