To obtain and continue having a custom mobile app, you need to be on a paid plan.
If you downgrade your account to a free plan:
Your Android app will be removed from the Google Play store and you will need to notify your Android-using clients to delete your old custom app from their mobile device and download the general Trainerize app. Once installed, they can use their existing username and password to login.
Your iOS Custom Branded Fitness App will revert to general Trainerize branding.
Should you decide to upgrade to a paid plan again at a later date, you will then need to purchase a new custom app and go through the app submission process again.