If you are building applications for Google Assistant or Google Home, VoiceInsights is a must-have.
VoiceLabs provides voice experience analytics, enabling you to quickly understand how consumers are using your Actions and how to evolve your voice experience. In addition to the necessary metrics including unique usage, retention and session analysis, VoiceLabs provides new visualizations to quickly analyze and improve the user experience. These capabilities include Voice Pathing, User Profiles and Voice KPIs.
Below is a video showing what you get for free, here is how to get started