Sprinterval is described as 'Six-week High Intensity Interval Training (HIIT) program using sprint intervals. The program gets a little bit harder every day as you gradually increase your work-to-rest ratio. HIIT training provides better results in a shorter time than just jogging' and is an app in the sport & health category. There are three alternatives to Sprinterval for Android and iPhone. The best Sprinterval alternative is Start Running, which is free. Other great apps like Sprinterval are RunDouble: Couch to 5K and Couch to 5K.