Cookies and browser storage
Updated 7 November 2026
Twinmapper only uses functional cookies and browser storage. No cookie banner is needed.
- tm_session (cookie, functional): keeps you signed in, 30 days.
- TM_LOCALE (cookie, functional): your language choice, 1 year.
- tm-guest-vault (localStorage): your twins as a guest.
- tm-account-key:<e-mail> (localStorage): your account key, only if you choose to remember it on this device.
- tm-last-email (localStorage): prefills the sign-in form.
- tm-theme (localStorage): light or dark theme.
- tm-guest-banner (sessionStorage): whether you dismissed the guest notice for now.
We use no tracking or advertising cookies.