Nike+ GPS has updated their app with a “Tag” feature which allows runners to challenge their friends to complete a suggested time or distance within the next three days. The person who ran the shortest distance, or was the last to run, is “it.”
The app already incorporates other social aspects including broadcasting your runs via Facebook and Twitter (Share Run), as well as receiving encouragement from friends while you run (Cheer Me On).
I started out using the Nike+ system and found the footpod version very inaccurate. The GPS version did not seem much better. Additionally, it is quite a drain on your battery. If you want to use it, and listen to a playlist, your either have to run very fast to cover the distance or go shorter. Compound the energy drain with a pair of bluetooth headphones, and you have around an hour and a half run window. The app does have a voice alert system so you can check your pace and distance without fumbling with your iPhone too much.
The Nike+ GPS app is $1.99 in the App Store and is compatible with iPhone 3GS/4 or iPod Touch 2G/3G/4G running iOS 4.0+. However, some functions (like GPS and Cheer Me On) would necessarily be exclusive to the iPhone.