BookFeedPrivacy Policy
BookFeed is a reading app for iPhone made by Mykhailo Mirzaiev, an independent developer (“we”). This policy explains exactly what the app collects, why, and who processes it. In short: your books and what you read in them stay on your iPhone. We collect a small amount of anonymous usage data to improve the app and to measure where installs come from, and we never sell data.
What stays on your device
Books you add (EPUB, TXT, PDF), their text, titles and covers, your reading position, bookmarks, search queries, settings and reading history are stored only on your iPhone, in the app’s private storage. They are never uploaded to us or to anyone else. Deleting the app deletes them. “Export my data” in Profile lets you save a copy of your progress, bookmarks and reading history as a file.
What we collect
| Data | Purpose | Processed by |
|---|---|---|
| App usage events: onboarding steps and answers, opening and finishing a book (built-in books by their id, your own books only as “imported”), reading session length, daily goal, sounds and backgrounds turned on, paywall views and purchase results. Device model, iOS version, app version, language and approximate country (derived on the processor’s side; the IP address is not stored). A random app-specific identifier. | Understanding how the app is used and improving it | Amplitude, data stored in the EU |
| Install and attribution data: a random AppsFlyer identifier, install date, app version, and attribution signals provided by Apple (SKAdNetwork / AdAttributionKit, Apple Search Ads). Subscription events (trial started, subscribed) without any personal details. | Measuring which campaigns bring readers, and whether they pay off | AppsFlyer |
| Purchase data: an anonymous app user id, the subscription product, price, currency, storefront country, transaction ids, renewal and cancellation status. | Unlocking Pro, restoring purchases, subscription analytics | Apple (App Store) and RevenueCat |
| Emails you send us. | Answering you | Us; email is forwarded through Cloudflare to our mailbox |
We do not collect your name, email, contacts, location, photos or the Advertising Identifier (IDFA). The app never shows the “Allow tracking” prompt and does not track you across other companies’ apps and websites. We do not use the identifier for vendors (IDFV) either.
Payments
Subscriptions are sold by Apple. Apple processes your payment; we never see your card or Apple Account details. Apple’s handling of your data is covered by Apple’s Privacy Policy.
Legal basis (EU/EEA/UK users)
We process usage and attribution data on the basis of our legitimate interest in running, measuring and improving the app (GDPR Art. 6(1)(f)), keeping it anonymous and minimal. Purchase data is processed to perform our contract with you (Art. 6(1)(b)). Emails are processed to answer your request.
Processors and transfers
We use Amplitude (analytics, EU data centre), AppsFlyer (attribution), RevenueCat (subscriptions) and Apple. Some of them are based in the United States; transfers rely on the EU–US Data Privacy Framework or Standard Contractual Clauses. They process data on our behalf and may not use it for their own purposes.
Retention
Usage and attribution data are kept for up to 24 months and then deleted or aggregated. Purchase records are kept as long as needed for your subscription and for accounting. Emails are kept as long as needed to help you.
Your rights
You can ask us to access, correct or delete data about you, object to processing, or restrict it, and you can complain to your data protection authority. Because analytics are tied only to random identifiers and not to you, we may need your help to find them — write to support@mishka.day and we will explain how. Deleting the app removes everything stored on your device.
Children
BookFeed is not directed to children under 13, and we do not knowingly collect personal data from them.
Changes
If we change what the app collects, we will update this page and the date above before the change ships.
Contact
Mykhailo Mirzaiev — support@mishka.day