Book.io vs csBooks
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Book.io
Manage your digital library of eBooks and audiobooks with a user-friendly interface. Customize your reading experience with various themes and text settings, and enjoy features like bookmarking and embedded media. Own and control your digital content.
- eBook and Audiobook management
- Customizable themes and text settings
- Seamless navigation and bookmarking
- Audiobook playback and reading/listening switch
- Embedded video and fixed format support
- Social media login
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Book.io is the eBook and Audiobook app that empowers you to manage your digital library on your terms. Transform your reading experience with a range of features crafted for maximum enjoyment. Key Features: 1. Effortless Reading: Navigate your eBooks seamlessly with our user-friendly interface. 2. Customizable Themes: Personalize your reading environment with Light, Paper, or Dark themes. 3. Tailored Text Settings: Adjust text size, line spacing, and fonts, including options like Open Dyslexic. 4. Bookmarking and Navigation: Easily bookmark pages and navigate through your reading material. 5. Media Support: Immerse yourself with audiobooks, embedded videos, and fixed format support. 6. Dark Mode: Read comfortably in low-light settings with our sleek dark mode. 7. Multi-Language Support: Experience Book.io in Spanish or English for a tailored touch. Why Choose Book.io? Embrace the future while preserving the past with our collection of Unchangeable, Unburnable, Unbannable eBooks and Audiobooks you own and control. Join our community of satisfied readers today. Download Book.io and embark on your journey of actual digital ownership. What’s New: - Audiobook Support: Dive deeper into your favorite stories with our new audiobook feature. Switch between reading and listening anytime, anywhere. - Social Media Connection: Book.io is now easier than ever to get started. Log in or create an account using your existing social media credentials.
csBooks
This app allows users to read and manage ePub and PDF books from their device. It offers features like automatic thumbnail generation, reading progress tracking, customizable text size, and multiple themes for a comfortable reading experience.
- Read ePub and PDF files
- Manage book library
- Auto book thumbnail generation
- Reading progress tracking
- Customizable text size and font
- 8 stylish reading themes
- Cloud storage and desktop sync
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Read ePub, PDF, MOBI, Docx, CBZ, CBR, DJVU and MOBI book files with csBooks – the best ebook reader and digital library manager for iPhone and iPad. Import, organize, and read books offline with our all-in-one book reader app. The #1 ebook reader app for offline and online reading: ePub reader & ePub viewer PDF reader & PDF viewer MOBI reader & MOBI viewer CBZ comic book reader Word document reader (DOCX) Book Reader Features: ePub reader with adjustable fonts, text size & 8 reading themes PDF reader with page progress tracking & navigation MOBI ebook reader for Kindle-format files Comic book reader for CBZ files Book library manager with card view & list view Auto-generated book cover thumbnails Reading progress tracker Cloud sync & cloud backup for your ebook library Offline reading – read books without internet Import ebooks from Files, email & cloud storage Desktop sync for cross-device reading Best ebook reader for digital library management. csBooks organizes your ePub books, PDF books, MOBI ebooks, and comic books in one beautiful reading app. Fast ePub viewer, smooth PDF viewer, and full-featured book manager. Read ebooks offline. Sync your book library to desktop. Track reading progress. csBooks is the ebook reader and library app for serious readers. Download csBooks – ebook reader, PDF viewer & digital library app. ------- Developer contact: studiocaesium@gmail.com Privacy Policy: https://www.caesiumstudio.com/privacy-policy End User License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula
Screenshots
Verdict
The clearest difference is in-app purchases: Book.io at none against csBooks's 2. Book.io also leads on ads (none vs shown). csBooks's advantage is update cadence (every 10 days vs every 2 months) and device support (4 vs 2). On price, review sentiment 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. csBooks sells 2 in-app purchases, starting at $6.99 per month. Book.io asks for nothing beyond the download.
Book.io ships an update every 2 months, csBooks every 10 days. The most recent releases landed on October 24, 2026 and October 12, 2026 respectively.
| Parameter | Book.io | csBooks |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (58 ratings) — better | — |
| Positive reviews | 96.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 58 — better | — |
| Update frequency | Every 2 months | Every 10 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 31 MB | 63 MB |
| Age rating | 12+ | 4+ |
| Developer | Book.io, Inc | Ravi Kumar Sharma |
Customer experience
Book.io
csBooks
In-app purchases
Book.io
No in-app purchases
csBooks
- Unlimited Pro (Monthly)$6.991 Month
- Unlimited Pro (Yearly)$22.991 Year
