One Active Session

A Scribble account can be signed in on one device at a time. When the same account signs in on a new device, the old session ends.

Why we do this

• It keeps progress in one place. There's no risk of two devices writing conflicting state.
• It makes "lost iPad" recovery clean — sign in on the replacement, and the lost iPad is automatically signed out.
• It mirrors how schools actually use the app: one student, one assigned iPad.

What it looks like in practice

If a student signs in on iPad B while they were signed in on iPad A:

• iPad B starts working normally.
• The next time iPad A tries to do anything that requires sign-in (resume practice, write attempts, etc.), it sees the session is gone, clears local state, and returns to the sign-in screen.

There's no battle between the two iPads. The most recent sign-in wins.

On launch and on foreground

The app re-checks sign-in status:

• When it launches.
• When it comes back to the foreground after being in the background.

So even an iPad that's been asleep for a while will discover it's been signed out the next time someone picks it up.

What you should do

• Pick one iPad per student and stick with it.
• If the iPad signs a student out unexpectedly, the most likely cause is they (or someone else) signed in on another iPad. Sign back in on the iPad you want to use.

RelatedSigned out suddenlyWhen a sign-out feels unexpected, here's the diagnostic path.Read more