Heart rate monitor for Window Phone working with Cyclers app. Support Bluetooth heart rate monitor ZEPHYR HXM around $75.00
@Mischa, the app Cyclers work with Strava and support heart rate using the Bluetooth Zephyr monitor
I am using Cyclers. It working good with my Bluetooth heart rate sensor. You can be cycling or running. Crash once in a while but working good.
Another user waiting for the Windows Phone app here. (May 21 2014)