Love how it works with HealthKit to show you your ranges during workouts. Also love how it prompts you to enter an activity when it notices an elevation over a short period of time.
The UI could use a bit of work but the Watch app is fantastic! I use theWatch complication every day. Superior to the native heart rate glance offered by Apple.
stewart.moreland about Cardiogram: HeartIQ MigraineIQ, v1.0.2