Extrava extends your Strava usage with some nice features. Using this app you can
- Upload existing activities (FIT, TCX, HRM) without heart rate, power, cadence information.
- Record new activity using the supported Bluetooth LE sensors (see below)
- Download activities from Strava (FIT, GPX).
- View information about your local and Strava activities
- Pre-download Strava segments' data and view segments during activity recording
- Wind info (from current weather) for Strava segments
- Connect to Runkeeper, Polar Personal Trainer
You can find the list of supported sensors here: http://gabornemeth.asphostpage.net/extrava/supported_sensors.html