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Your email gives you a platform account: saved Locked Cards, Data Refresh, Revision, and reviews all live under it.

One-click sign-in, no password or code required — recommended.

or with email

We’ll email you an 8-character verification code—enter it to sign in, no password required.

Want to also store your Locked Cards in your own GitHub repository? After signing in, go to Settings and use "Connect GitHub storage"—it is simply an optional storage destination and does not affect your account identity.