This is a great app for beginner-intermediate (or those of us fooling ourselves into intermediate players!) It has a lot of the songs I look for, many more than the full subscription to Tab Pro (I spent $25ish on TabPro and prefer Riff much more). Its fun to play along, and even if the screen isnt giving you the exact right chord, since its based on the actual YouTube song, your better version sounds fine. Its nice to be able to note your own changes on TabPro, but Riff is so much easier to use that its my go-to anyway.
Happy Shredding - my fingers hurt in the best way!
bakerbear about Riffstation - Guitar Chords, v1.13