Privacy Policy

Flippy - Page Flip PDF Reader · Effective May 12, 2026

Overview

Flippy is a PDF reader available on Android and iOS. Your privacy matters to us. This policy explains what data Flippy accesses, how it is used, and your choices.

Data Stored on Your Device

Flippy stores all core data locally on your device. This data never leaves your device unless you explicitly enable Cloud Sync (a premium feature).

• PDF files you import into the app
• Bookmarks, highlights, and annotations you create
• Reading progress (current page, reading history)
• App preferences (theme, reading settings, tags)
• Drawings made with the draw tool

This data is stored in your device's local storage and is not accessible to us or any third party.

Cloud Sync (Premium Feature)

If you choose to enable Cloud Sync, the following applies:

• Authentication: You sign in with your Google account via Google Sign-In. We receive your name, email address, and profile photo to display in the app. We do not store your Google password.
• Data synced: Bookmarks, highlights, reading progress, tags, and reading statistics are stored in Google Firebase Firestore, associated with your Google account.
• PDF files are never uploaded. Only your reading data (bookmarks, progress, etc.) is synced.
• You can delete your cloud data at any time from the app's settings.

AI Read-Aloud (Premium Feature)

Flippy offers text-to-speech powered by OpenAI's Text-to-Speech API.

• When you use this feature, the text content of the current page is sent to OpenAI's servers to generate audio.
• No PDF files are uploaded. Only extracted text is transmitted.
• OpenAI processes the text and returns audio. OpenAI's use of this data is governed by OpenAI's API Data Usage Policies. Per their policy, data sent via the API is not used to train their models.

AI Q&A and Summaries (Premium Feature)

Flippy uses Anthropic's Claude API to answer questions about your PDFs and generate summaries.

• When you use this feature, the text content of your PDF is sent to Anthropic's Claude API along with your question.
• This data is processed to generate a response and is not stored by Flippy.
• Anthropic's use of this data is governed by Anthropic's Commercial Terms. Per their policy, data sent via the API is not used to train their models.

In-App Purchases

Flippy offers optional premium subscriptions. All purchases are processed by Apple (App Store) or Google (Google Play). We do not collect or store any payment information. Purchase management and billing are handled entirely by the respective platform.

Analytics and Advertising

There are no ads inside Flippy. We do not display ads, sell your data, or include any third-party advertising or analytics SDKs (no Meta/Facebook SDK, no Google Analytics, no crash reporting SDKs).

Flippy uses a small backend service we operate (a Cloudflare Worker) to route AI Q&A and Read-Aloud requests to their respective providers (Anthropic and OpenAI). This proxy lets us keep our API keys server-side so they aren't extractable from the app. The backend receives:

• An anonymous install token — a random ID generated on first launch and stored only on your device. Used to apply rate limits per install so a single device can't run up unexpected charges. Not linked to your name, email, or any account.
• The text of your AI question and the PDF content you're asking about (only for AI Q&A / summary requests; only for as long as it takes to forward the request).
• The page text you've asked Flippy to read aloud (only for Read-Aloud requests).
• Your IP address, as is standard with any HTTPS request. Cloudflare may retain this in standard request logs (typically days, not months).

The backend does not store the contents of your questions or PDF pages beyond the lifetime of each request. It does not receive bookmarks, highlights, notes, reading history, or any data that identifies you.

The backend also keeps a small daily counter of certain in-app events (for example: when someone activates developer mode by tapping the version number five times) so we can detect abuse of the free-trial features. These counters are anonymous (only the install token is associated) and roll off after 90 days.

Third-Party Services

Flippy integrates with the following third-party services only when you explicitly use the corresponding feature:

• Google Sign-In — for Cloud Sync authentication
• Google Firebase / Firestore — for cloud data storage
• OpenAI Text-to-Speech API — for AI Read-Aloud (routed via our backend; see Analytics section above)
• Anthropic Claude API — for AI Q&A and summaries (routed via our backend; see Analytics section above)
• dictionaryapi.dev — for in-app word definitions (only the selected word is sent; no account or API key required)
• Cloudflare Workers — our own backend proxy that holds OpenAI/Anthropic credentials and applies rate limiting

Each service is subject to its own privacy policy. No data is shared with these services unless you actively use the corresponding feature.

Children's Privacy

Flippy is not directed at children under the age of 13. We do not knowingly collect personal information from children.

Data Deletion

You can delete all your data at any time:

• Local data: Uninstall the app or clear app data from your device settings.
• Cloud data: Use the "Delete Cloud Data" option in Flippy's settings, or contact us to request deletion.

Changes to This Policy

We may update this privacy policy from time to time. Changes will be posted on this page with an updated effective date.

Contact Us

If you have questions about this privacy policy or your data, contact us at:

flippypdf@gmail.com