Join the testers group
Open the 400 Android testers group and tap Join group.
Join the group400 ON ANDROID
Join the Android test
on Google Play.
400 is in a free test on Google Play. On your Android phone (Android 8 or later), use the Google account signed in to the Play Store.
Become a tester
Open the test page and tap Become a tester. If it says you can’t join yet, wait a minute and try again.
Open the test pageInstall 400
Install 400 from Google Play. It updates automatically, like your other apps.
Open Google PlaySign in with Google or your email; Sign in with Apple isn’t available on Android. Installed 400 from this website before? Installing from Google Play updates it and keeps your account. Nobody posts in the group, and only we can see who joined.