evidence: Purchase the $99 QardioArm smart blood pressure monitor — an easy-to-use, portable arm cuff — and pair it with this free app for automatic syncing and analytics. The app automatically takes the average of three consecutive readings (something doctors often recommend) and lets users set reminders and quickly share data with their health team. [...] This free Android-only app lets you track blood pressure and pulse measurements over time, with options to add notes and tags to each entry. It automatically categorizes readings into blood pressure zones, including stage 1 and 2 hypertension, prehypertension, normal and hypotension. [...] - JMIR mHealth and uHealth: "Quality of Blood Pressure Tracking Apps for the iPhone: Content Analysis and Evaluation of Adherence With Home Blood Pressure Measurement Best Practices"