One code. No password.

Same door whether this is your first question or your fiftieth. An account exists for one reason: so the credits you buy belong to you rather than to a cookie in one browser.

A password is one more thing for you to lose and one more thing for us to leak. A six-digit code sent to your address proves the same fact — that the address is yours — and then it expires.

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We never send a sign-in link — only a number you type yourself. Any email claiming to be us that asks you to click something to sign in is not us. Your saved thinking stays in this browser either way; an account does not move it.