Withings was one of the first companies to market a blood pressure cuff that would work with a smartphone. The first version worked on iOS. The unit was connected by the older style Apple 30 pin connector. In the new Withings Wireless Blood Pressure Monitor, the unit can be connected to either an iOS or Android device via Bluetooth. But you can also use a standard USB to USB micro connector. Withings has updated the app for the device, making it easy to set up, pair, and store and manage data. The app automatically launches when you turn on the blood pressure cuff.
The downside is that the device is still somewhat bulky, due in part to the inclusion of the air pump and four AAA batteries on the sleeve. Nor does it come with a carrying case unlike some of its competitors. But it paired with my iPhone 5S almost immediately and was very easy to use and matched the accuracy of other calibrated cuffs. I have mixed feelings about the lack of a rechargeable battery. On one hand it means you won’t have to wait for it to charge. On the other, you’ll need some extra AAA batteries around. It’s been approved for use by the US FDA, by the EU, and several other countries. Price is just about $130.