1

Join the Google Group

Google requires every closed beta tester to be part of a Google Group first. Click the link, hit "Join group," and you're in. (You'll need to be signed into the Google account you use on your Android phone.)

Join the Google Group
2

Opt in to the closed test

Once you're in the Google Group, open this next link and tap "Become a tester." After that, Checkin will show up in the Play Store like any other app — install it and you're set.

Become a tester
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Heads up: it can take Google a few minutes (sometimes up to an hour) to recognize that you've joined the test. If the Play Store says the app isn't available yet, give it a bit and try again. You're not doing anything wrong — Google is just slow.

On iOS instead? Skip the hoops.

Download on the App Store