Ive actually really enjoyed using this app. Its very much like a crossfit high intensity workout without the weights. If you choose to use the free version (not using what they call the "coach") you get access to 11 different workouts. With the coach, you pay around $30 a month and you get additional features plus the other 19 workouts (total 30)
I havent had the crashing issues that everyone is talking about.
Odom about Freeletics: Workouts & Fitness, v3.4.3