Klyft is a consumer health platform that unifies data from every major wearable — Apple Watch, Garmin, WHOOP, Oura and Fitbit — into a single daily Arc Score across recovery, nutrition and fitness, plus a weekly longevity score called Meridian.

The scoring engine is fully deterministic and grounded in over 800 peer-reviewed studies in exercise physiology, sleep science, chronobiology and nutrition. AI is used only for the parts that benefit from language — daily coaching through an assistant called Lumen, conversational meal logging and adaptive workout generation — never for scores or health claims. This is not a wrapper around an LLM. It's a scientific engine with an AI coaching layer on top.

Built for people who already train hard and already wear the devices — runners, lifters, hybrid athletes, Hyrox and CrossFit competitors — and want their data to translate into clear daily decisions instead of another dashboard to read.

Live on the iOS App Store.