Hello,
I’m the developer of Pagë, a reading tracker application for iOS and Android.
The app uses the Google Books API to retrieve publicly available book metadata such as title, authors, ISBN, publisher, publication date, description and cover image URL.
The application is free to use.
We also offer an optional Premium subscription. Premium does not provide access to Google Books data. It only unlocks additional features that we have developed ourselves, such as:
- Reading statistics
- Unlimited reading lists
- Book adaptations
- Personalization features
Before continuing development, I would like to clarify whether this usage complies with the Google Books API Terms of Service.
Specifically:
- Is it permitted to use the Google Books API in a freemium application with optional Premium features?
- May we store the metadata returned by the API in our own database to improve performance and avoid repeated API requests?
- May we serve this cached metadata to future users instead of requesting the API each time?
- If not, is there any commercial license or separate agreement available?
I have read the Terms of Service, but I could not find further clarification regarding these points.
Thank you very much for your help.