We have covered plenty of heart rate monitors and blood pressure apps here in the past. Accutension happens to be a smart blood pressure kit that provides you with accurate, consistent readings. It listens to the sound of the blood flow and lets you record them on your smartphone. It can work with your sphygmomanometer or independently with its own cuff.
The companion app lets you record the blood flow sounds, visualize them, and share the results with your doctor. The developers are offering 4 versions of this kit on Indiegogo.