This app was mentioned in 6 comments, with an average of 2.67 upvotes
No it's not free, but it's pretty cheap (like about the price of a McDonald's meal or cheaper). yes and either iOS or play store, depending on your device.
Google Play has it for 99 cents
https://play.google.com/store/apps/details?id=com.outerminds.pewdiepie
I like PieDiePie: Leged of Brofist
https://play.google.com/store/apps/details?id=com.outerminds.pewdiepie&hl=en_US
supports keyboard.
maybe use this instead? https://play.google.com/store/apps/details?id=com.outerminds.pewdiepie