Privacy

Plain language. Last updated September 2026.

Email sign-ups

If you leave your email (for example to hear when the iPhone app launches), we store it with the devices you ticked and the page you signed up from. We use it only for that announcement and important updates about Prowl. We don't sell or share it. Email us to be removed.

Downloads

We count Mac installer downloads per day. Nothing else is recorded: no IP address, no identifier.

The apps

This covers the Mac app and Prowl for Chrome and Edge. The browser version runs on marvel.com/prowl and keeps your library and progress in your browser's extension storage. To link sync, it reads your own Disney sign-in token from your browser, sends it once to be verified, and never stores it.

• Your Disney password is typed on Disney's own login page. Prowl never sees or stores it.
• Sync stores your reading progress, library and lists so your devices match. Linking by Disney account keeps only a one-way hash of your Disney user id, never your tokens.
• Community shows your handle, profile picture and the lists you choose to share. Reading progress on shared lists is shared as counts only.
• Usage: we count how many devices open the app each day, with no content and no identity beyond a random device key.
• Comics stream from Marvel and are never stored by Prowl.

Deleting your data

In the app: Settings → Delete My Prowl Data on the Server. It removes everything the server holds for you.

Not affiliated

Prowl is an independent project and is not affiliated with, endorsed by, or sponsored by Marvel Entertainment or The Walt Disney Company.