Audipo is a great option if you'd like to alter the tempo of your mix but don't have access to an Apple product. Prior to having my iPhone, I had a Galaxy Note and used this app.
While the tempo alteration isn't listed in bpms, the percentage of speed can be altered so you can feel out the speed. The pitch won't change unless you modify it.
While I own an iPhone, iPad, and iPod, the great thing I love about Android products is that you can download the music DIRECTLY to your phone without having to use a computer (dealing with iTunes can get stressful at times). The thing I loved about having my Note is that I could download my music on the go and use it with Audipo right away... even minutes before my class. You can check out Audipo in the Google Play Store here.
Have any questions or feedback about Audipo? Comment below!