Your personal AI coach.

Kern is a personal AI coach for training and recovery. It brings training, sleep, recovery, nutrition, and calendar information into one daily overview, helping you understand your day and choose what comes next.

The app combines strength and cardio planning, sleep and recovery trends, food logging, and a coach conversation. Your goals, schedule, and the data you choose to connect provide context for your plan. Kern is designed for adults aged 18 and over.

You choose which services to connect, including Apple Health, Strava, Google Health, and Google Calendar. Personal account information and health data are private. The public website, API, and MCP server provide product information and published knowledge articles only.

The public knowledge base and sources page explain the concepts and methodology behind Kern. Kern provides informational fitness and wellness guidance and does not diagnose conditions or replace qualified healthcare advice.

Kern is available for iPhone through TestFlight and is free during beta. Follow the download link on the homepage to install TestFlight and accept the invitation. For product questions, account help, or feedback, email support@joinkern.com.