# DuoRead — Support

Canonical: https://sakura5.app/duoread/support  
Updated: 2026-10-09  
Publisher: Sakura5 (https://sakura5.app) · support@sakura5.app

Need help with DuoRead? We're happy to help.

## Contact

Email [support@sakura5.app](mailto:support@sakura5.app) — a real person reads it, usually replying within a couple of days. Tell us your device model and OS version and we'll get to the bottom of it faster.

## What DuoRead does

DuoRead is the first reader dedicated to iPhone Duo. Folded, the outer screen shows the book you're reading as a closed book with its cover; unfolded, it opens to two facing pages with a physics page turn. It reads EPUB, PDF, DRM-free MOBI and AZW3, and DOCX, with highlights and notes, and DuoRead Premium adds AI Explain, Translate and Summarize. The app is available in English, Korean, Japanese and Spanish. No account is needed.

## Frequently asked

- **Which formats does DuoRead open?** EPUB, PDF, MOBI, AZW3 (KF8) and DOCX — DRM-free files only.
- **A book won't open.** It is most likely protected by DRM, which includes most books bought in the Kindle Store. DuoRead tells you so on import and never removes or bypasses DRM. If a DRM-free file still fails, email us the format and your device model.
- **Do I need an iPhone Duo?** The closed-book cover and the two-page spread are made for iPhone Duo. On iPad in landscape and in a wide Mac window the reader also shows two facing pages; in iPad portrait and on any other iPhone it is a single-page reader.
- **What is free, and what needs Premium?** Every new install gets 3 days of everything free. After that, free means the complete reader, highlights, notes and dictionary for up to 3 books; DuoRead Premium adds the AI study tools (100 requests a day) and an unlimited library.
- **How much is Premium?** $5.99 a week, $15.99 a month, or $69.99 a year with a 3-day free trial on the yearly plan. It renews automatically until you cancel in iPhone Settings → your name → Subscriptions.
- **I subscribed but Premium is locked, or I have a new device.** Open the paywall and tap *Restore Purchases* while signed in with the Apple ID you subscribed with.
- **Refunds.** Payments go through Apple, so refunds are requested at [reportaproblem.apple.com](https://reportaproblem.apple.com). Email us if something didn't work and we'll help.
- **Where are my books stored?** On your device, in the app's own storage. Deleting the app deletes the library it held, so keep your own copies of your files.
- **What does an AI action send?** With on-device Apple Intelligence, nothing. Otherwise only the text you selected, plus the target language or a short piece of context, goes through our Google Cloud server to Google Gemini to produce the answer, with a random install ID used only to count the 100 requests a day. We do not store the text or use it for training. See the [privacy policy](https://sakura5.app/duoread/privacy).

## Common questions

- **Restore a purchase:** open the app's paywall and tap “Restore Purchases”.
- **Manage a subscription:** iPhone Settings → your name → Subscriptions.
- **Bug or feedback:** email us with your device model and iOS version.

DuoRead will be on the App Store soon.