For users on other browsers, go to our Discord and ask for the Steam key.
You can find the iOS Beta here. You will be prompted to join our TestFlight group, which is Apple's testing service. You will remain anonymous when you join Testflight this way.
Join the Spellsource Google Group, then follow the instructions in the welcome message to participate in testing. You must be logged into Google Play to join the testing program. Your e-mail will be shared with the developers.