Great But Only Half the Solution

An excellent breath timer. It recommends a cardiac coherence timer but it should be built-in. There are plenty of HRV apps. Ideally, there should be a third version that adds Bluetooth LE support and that uses HRV data to automatically adjust the breath timing to achieve maximum coherence. As it is now, the user has to guess about what works-- which is much slower and frustrating than having an app that learns and figures out the ideal breath pattern for you.

KenInSeattle about Vital-EQ Respiroguide Pro