Privacy policy

Last updated October 6, 2026. HammerSlip is made by Casefresh LLC (“we”).

What we collect

• Your account: your email address and password. Passwords are stored scrambled (hashed) by our sign-in provider; we can’t see them.
• Your subscription: whether it’s active, when it renews, and Stripe’s customer reference. Payments are handled by Stripe and Link, who act as the seller of record; we never see your full card details.
• Your computers: for each computer you use HammerSlip on, a scrambled (hashed) form of its hardware ID, its name, whether it’s Windows or Mac, the app version and when it last checked in. We use these to apply the 2-computer limit and the one-free-trial-per-computer rule. The real hardware ID never leaves your computer.

What stays on your computer

Your Whatnot sales, buyers’ usernames, sales logs, printed labels and settings stay on your computer. The browser extension only talks to the HammerSlip app on the same computer. If you choose to send us a diagnostics file for support, buyers’ usernames are left out unless you choose to include them.

Who processes it

Supabase (accounts and database), Vercel (this website) and Stripe (payments). They process data on our behalf to run HammerSlip. We don’t sell your data or use it for advertising.

How long we keep it

As long as you have an account. If you delete your account, we delete your account, subscription and computer records, except the scrambled IDs of computers that used a free trial, which we keep so the trial can’t be repeated. Stripe keeps payment records as the law requires.

Your choices

You can see your plan and computers on your account page, remove computers at any time, and ask us to export or delete your data by emailing support@hammerslip.com.