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Account & privacy

Sessions and devices

xīn zhōng yǒu shù — “To know exactly where you stand”

Where you are signed in, how to sign other devices out, and what support access means.

4 min read

Not what you were looking for?

Every device you sign in on gets its own session, and you can see and revoke all of them from your account. This is the page to use when you have signed in somewhere you should not have, or when you simply want to know where you are logged in.

What the list shows

  • Device typeDesktop, phone or tablet — enough to recognise which is which without identifying it precisely.
  • A location hintDerived from the IP address. Approximate, and often wrong on a mobile network or a VPN.
  • Last seenWhen that session was last active. The most useful column for spotting something that is not yours.
  • Which one is this oneThe session you are reading the page on is marked, so you can revoke the others without locking yourself out.

Signing a device out

Revoke any session from the list and it stops working immediately — the device is signed out the next time it touches the site, without needing to be online now.

Revoking the session you are currently using signs you out here, and the page tells you that is what happened rather than appearing to break.

Sessions expire after a week

A session lasts seven days and does not renew as you use it. So a device you use daily will still ask you to sign in about once a week.

That is a deliberate trade: a session that renewed on every visit would effectively never expire, which is fine until a device is lost. A weekly re-authentication is a small cost for a hard ceiling on how long a stolen session is useful.

If you see something you do not recognise

  1. Revoke itFirst, before anything else. It costs nothing and is instant.
  2. Change your passwordRevoking closes the session; changing the password closes the route back in.
  3. Revoke everything elseIncluding sessions you think you recognise. Signing back in on your own devices takes a minute.
  4. Tell usThrough the contact form, if anything looks like more than a shared device someone forgot to sign out of.

Shared and public devices

The commonest reason for an unfamiliar session is an ordinary one: a school computer, a family tablet, a laptop borrowed for an afternoon. Sign out when you leave a device that is not yours — and if you forgot, this page is the fix.

For a child’s account you manage, the same list is available on their account.

Common questions

Sessions last seven days and do not renew with use. It caps how long a stolen session stays useful, which is worth one sign-in a week.

Continue learning

Trouble signing inForgotten passwords, unverified emails, Google sign-in, and accounts you did not mean to make twice.What we measure, and what we do notPlainly: the data behind your progress, the three consent tiers, and the things we will never do.