MyNest provides quick and easy access to manage your Nest thermostat directly the menu bar on your Mac.
When you launch MyNest, there isn't an icon on the dock. MyNest is meant to only live on your menu bar. This should clear any confusion with thinking that the app does not launch.
In order to use this application, you will need to own a Nest thermostat and have access to your online account at nest.com.