The two named sensors use ANT+ to send the signal wirelessly, but there are two major issues with using ANT+ sensors with an iPhone. Firstly, the iPhone does not have an ANT+ chip which means that a plug in receiver is needed so that the phone can receive the ANT+ information. The second issue is that each ANT+ manufacturer wrote their own communication protocols (APIs) for ANT+ sensors, which means that even if we did develop the hardware plug in, we could not guarantee compatibility with other manufacturer’s hardware.
However, the iPhone 4S includes a Bluetooth 4.0 (Smart Ready) chip which means that Bluetooth 4.0 sensors can be used to directly communicate with the iPhone 4S without a plug in unit. Also, Bluetooth 4.0 uses a single API so all manufacturers should use the same API on their products.
Our newest version of BikeBrain includes Bluetooth Smart compatibility for heart rate and combo (speed and cadence) sensors. These functions will work with iPhone 4S and iPhone 5.