What this covers
This policy explains what information Plinth collects when you use the site at
myplinth.app or the Plinth reader application, how we use that information, and the choices you have about it.Information we collect
- Account information — your AthID, email address, and (if you link one) wallet address. We use the same AthID identity across Athenium services, so this information is governed by the AthID Privacy Policy in addition to this one.
- Purchase records — which books you've bought, when, and the publisher you bought from. Payment details (card numbers and similar) are handled by our payment processor and are never stored on Plinth's servers.
- Reading metadata — limited information about which books are in your library and basic usage signals from the reader application. Notes and highlights you create stay with you.
- Technical information — IP address, browser type, device type, and similar logs we keep for security and to keep the service running.
How we use your information
We use your information to provide the service: to show you your library, to complete purchases, to issue refunds, to detect fraud, to improve the product, and to communicate with you about things you've bought. We don't sell your data.
Who we share information with
- Payment processors (Stripe) to complete purchases.
- The AthID network for identity, ownership, and reader access.
- Service providers we use to operate Plinth (hosting, analytics, customer support). These providers are bound by contract to handle your data with the same care.
- Law enforcement when required by law, and only to the extent required.
Your rights
You can access, correct, or delete your account information. You can export your library and annotations. You can withdraw consent for anything you've previously agreed to. Email privacy@myplinth.app for any of the above.
Cookies and analytics
Plinth uses a small number of essential cookies (sign-in session, basic preferences). We don't use third-party advertising cookies. We may use first-party analytics to understand how the site is used in aggregate.
Data retention
We keep your information for as long as you have an account. When you close your account, we delete or anonymise your personal data within a reasonable period, subject to legal requirements to keep records (e.g. tax records).
Changes
If we change this policy, we'll update the date at the top and, for substantial changes, notify you by email or in-app message. Your continued use of Plinth after a change means you accept the new policy.
Contact
For privacy questions or data-rights requests, email privacy@myplinth.app.
Last updated: 2026-05-13