Last updated: July 12, 2026
Contact Us
Have a question, feature request, or need help? Email us at marblequillco@gmail.com. We typically respond within 24 hours.
Marble — EPUB & PDF Reader
Getting Started
- Import books via the Files app, share sheet, Google Drive, or Dropbox
- Add an OPDS catalog (e.g. Standard Ebooks) from the Catalogs tab
- Discover a Calibre Content Server on your local network via Bonjour, or add the server URL manually
- Open a book and use the Aa controls for fonts, spacing, margins, and themes
Marble Pro
- One-time unlock for iCloud sync (progress + annotations), reading stats, annotation export (Markdown/CSV), and advanced themes (Leather, Slate)
- Purchase or restore from Settings → Marble Pro
- Core local reading (library, OPDS, Calibre, formats above) stays free
Known Issues
- Calibre not discovered: Confirm the Content Server is running and your iPhone/iPad is on the same Wi‑Fi. Add the host and port manually if Bonjour is blocked.
- CBZ opens but CBR does not: ZIP-based CBZ is supported; full RAR CBR support is planned.
- iCloud sync: Only reading positions and annotations sync — book files stay on each device. Ensure iCloud is signed in and Marble Pro is unlocked.
Feature Requests
We build based on user feedback. Email marblequillco@gmail.com with ideas — TTS, extra formats, and more are on the roadmap.
Report a Bug
Please email marblequillco@gmail.com with a description of the issue, steps to reproduce, device model, and iOS version. For crashes, include the crash log if possible.
Privacy
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