Study Stack
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The first open downloads the app (about 4 MB), so on a weak signal this can take a minute or two. After that it opens from your device.

Study Stack hasn’t started yet

On a weak connection it may still be loading; the first open downloads about 4 MB. If you’re offline, it can’t start until you reconnect: turn on Wi-Fi or mobile data, then try again.

Your account is saved online, so nothing is lost.