Bluetooth HRM for iPhone 6

Jsnatch

http://www.amazon.co.uk/60beat-Heart-Monitor-iPhone-Android/dp/B0096DM3ES/ref=sr_1_1?s=sports&ie=UTF8&qid=1433096574&sr=1-1&keywords=60 beat heart rate monitor i use this one, it does have its own app but i prefer to use MapMyRun