The Spark Cardio is a solid fitness tracker. It’s GPS capability makes plotting runs or cycles easy, and it accurately tracks your distance covered, steps taken and calories burned. Plus, thanks to the built-in heart rate sensor, this wearable also picks up the intensity of your sessions. The Spark Cardio, like the Spark, works well with the TomTom MySports app, which is available on both iOS and Android. The app tracks your progress and uses graphs, pie charts, and maps to show your data. If you already have a favorite app, fear not, as TomTom Spark Cardio supports a number of popular third-party apps, such as Runkeeper and, of course, inKin.