Endomondo

• Compatible with Zephyr’s HxM and Polar’s WearLink+ BT heart rate monitors
• Versions available for nearly every mobile platform
• Simple, clean UI, regardless of how much screen Real Estate you’ve got to work with.
• Audio cues, automated from the app or via ‘Peptalk’, where your peers can send you encouraging audibles during your workout.
• Active social web portal with monthly contests and giveaways.
• Twitter and Facebook notifications integration
• Configurable display

It’s difficult to not consider Endomondo as one of the leaders in sports tracking apps. They’ve been around since 2008 and have established themselves as a market leader with an engaging social flair to encourage everyone to be more fit. Endomondo looks and feels different than anything out there and can appeal to a range of athlete experience levels.

Nothing complicated, clean, works out-of-the-box. Kudos for offering support for more than one heart monitor.