Does the Chineasy app use simplified or traditional characters?

You can choose to study either simplified or traditional Chinese. Just tap on the blue Bao icon in the top left-hand corner of the screen and then go to Settings. Select the Chinese written form you’d like to learn.

Still not sure what’s the difference between simplified and traditional Chinese? Check out this video!  
https://www.youtube.com/watch?v=iWG1Taz3Ik0&