Privacy Policy

Marginalia & Co. is operated by the app owner. For privacy requests, use the contact method listed on the app store page, project page, or support channel where you received access to the app.

We collect the account and reading information you choose to provide, including email address, display name, books, reading status, reading sessions, pages, ratings, written reviews, API tokens, and app settings.

We may process technical information such as device/browser details, authentication cookies, request logs, error details, timestamps, and IP-derived security signals to keep the service working and prevent abuse.

We use your data to provide your shelf, sync across devices, save reviews and ratings, power recommendations, maintain API access, debug errors, protect the service, and improve the app.

Recommendations may use book metadata, your ratings, your shelf, and compact embeddings derived from book and preference text. Embeddings are used for matching; they are not sold as a profile of you.

The app uses service providers for authentication, database hosting, book search, book covers, recommendations, and affiliate links. These may include Supabase, Google Books, Open Library, OpenAI, and external book retailers or affiliate networks such as Bookshop, Shopee, Lazada, Amazon, Kobo/Rakuten, Audible, and Awin.

When you follow an external retailer or affiliate link, that third party handles your visit under its own terms and privacy policy.

We use necessary cookies or similar storage for sign-in, security, and app operation. We do not currently use advertising cookies inside the app.

We keep your account and reading data while your account is active or as needed to provide the app, comply with legal obligations, resolve disputes, or protect the service. If you ask us to delete your account, we will delete or anonymize personal data unless we need to keep limited records for legitimate operational or legal reasons.

You can update or delete many reading entries in the app. You can request access, correction, export, or deletion of your personal data through the support contact. Depending on where you live, you may also have rights to object, restrict processing, or complain to a privacy regulator.

The app is not intended for children under 13. If you believe a child has provided personal data without appropriate consent, contact us so we can review and delete it where required.

We use reasonable technical and organizational measures, including managed authentication and database access controls. No online service can be guaranteed perfectly secure.

We may update this policy as the app changes. The latest version will be posted here with a new "Last updated" date.