# DuoRead — Privacy Policy Canonical: https://sakura5.app/duoread/privacy Updated: 2026-10-09 Publisher: Sakura5 (https://sakura5.app) · support@sakura5.app *Last updated: 2026-10-09* DuoRead is built by Sakura5. There is no account and no sign-up, no ads and no tracking. Your library — the books you import, your reading position, your highlights and your notes — lives on your device and is never uploaded to us. The only content that ever leaves your device is the text you select when you use a cloud AI feature (Explain, Translate or Summarize), sent only to produce that answer, together with a random install identifier used only to count the daily AI limit. ## What the app handles - Your books, highlights and notes — stored on your device only. We never receive them. - AI requests — when you tap Explain, Translate or Summarize and the answer comes from the cloud, the text you selected, plus the target language or a short piece of surrounding context, is sent to our server (a Google Cloud function run by Sakura5), which forwards it to Google Gemini to produce the answer. It is not linked to your identity, and we do not store it or use it for training. - A random device identifier — on first use of cloud AI the app creates a random ID for this install (stored in the device Keychain) and sends it with each AI request, only to count the 100 requests a day. It is not linked to your name, Apple ID or any other identity, it is not used for tracking or advertising, and the daily count is deleted automatically. - Subscription status — Apple tells the app whether a DuoRead Premium subscription is active so it can unlock and restore it. We never see your payment details. ## App Store privacy label DuoRead's App Store privacy label declares two data types, both collected for **App Functionality**, **not linked to you**, and **not used for tracking**: **Other User Content** (the passage you send to a cloud AI feature) and **Device ID** (the random install identifier used only for the daily AI limit). Nothing else is collected. ## AI features (DuoRead Premium) Explain, Translate and Summarize are part of DuoRead Premium (and of the 3-day free trial every new install starts with). On devices where Apple Intelligence is available and the on-device AI setting is on, the answer is generated on your device and nothing is sent. Otherwise the app sends the text you selected — and, depending on the action, the target language or a short piece of context around it — to our server, a Google Cloud function run by Sakura5, which forwards it to Google Gemini and returns the answer to your device. Each request carries the random install identifier so the server can count 100 requests per day; no account, name, email or Apple ID is attached. We do not store the text, and it is not used for training. If you never use an AI feature, nothing from your books leaves your device. ## Your books stay on your device Books you import are kept in the app's own storage on your device, together with your reading position, highlights and notes. They are not uploaded to us or to anyone else. If you delete DuoRead, the library it stored goes with it, so keep your own copies of your files. ## What we do NOT do - We do not sell your data. - We do not use your data for advertising or cross-app tracking. - We do not offer accounts at all — there is no sign-up, no sign-in and no profile. - We do not upload your books, highlights or notes, and we have no access to them. - We do not show ads, and we do not track you across apps or websites. - We do not store the text you send to an AI feature, and it is not used for training. ## Third parties Apple handles subscriptions through the App Store: payment is charged to your Apple ID and we never see your payment details. For cloud AI features, our server (a Google Cloud function run by Sakura5) forwards the selected text (and the target language or short context) to Google Gemini, operated by Google LLC, which generates the answer; only the random install identifier used for the daily limit travels with it, never your identity. There are no ad networks, no analytics SDKs and no data brokers. ## Children DuoRead does not knowingly collect personal information from children. ## Contact Email [support@sakura5.app](mailto:support@sakura5.app).