However, in May 2015 the separate Tab Pro app became cross-platform. Voilà. Subscriptions purchased on our website/iOS/Android can be shared to other platforms via an Ultimate Guitar account. So you just need to log onto the app with an Ultimate Guitar account to get access.
Note: Separate Tab Pro app and Tab Pro in-app for Ultimate Guitar Tabs app for iPhone/Android are not the same.
Tab Pro in-app for Ultimate Guitar Tabs app for iPhone/Android is not cross-platform. It allows you to use Pro Tabs only inside the Ultimate Guitar Tabs app on iPhone/Android.