Can I use my ad-removal subscription on multiple devices?

Absolutely! You can use your ad-removal subscription in the app on any device on which you are logged into the app store account you used to purchase the subscription. On iOS, this means that your devices will need to be logged into the same Apple ID account. On Android, this means that your devices will need to be logged into the same Google Play Store account. If the subscription does not automatically activate on all of your devices, you can prompt it by going to the "Upgrade" tab in the app's menu and tapping "Restore Purchases." (This is the same process for if your subscription does not go into effect immediately after purchase.)

Please keep in mind that you will not be able to use subscriptions across different operating systems. This means that a subscription purchased on an iOS device (through the App Store) cannot be used on an Android device, which tracks subscriptions through the Play Store, and vice versa.