Health you own.
Evidence you can use.

The most complete picture of human health — owned by people, not a device brand.

Keep your wearable. Keep your labs. Keep your freedom.

No new hardware · Never sold · Opt-in research — you share

The ambition

The largest voluntary map of human health.

A living picture of how people age, recover, train, and heal — wearables, labs, and the lived day — built by participants who choose to be here.

Membership is for your clarity. Contributing de-identified research is optional, off by default. When research access creates value, you share in it.

Optimize your health. Advance science if you want. Never as someone else's product.

What we stand for

Holistic by design

Live. Train. Nutrition. Evidence. Experiment — five pillars, one spine.

No ecosystem trap

Bring Whoop, Oura, Apple Health, Garmin, labs — whatever you already trust.

Built with the community

Members shape the product. Opt in to research when you're ready — and share the upside.

Membership

One membership. Full access.

$399/year or $39/month. Cancel anytime.

$399/yr · $39/mo

30-day trial after you start using Kosei · Students 40% off annual

Join the community

FAQ

Quick answers.

What is Kosei? A community layer for optimizing your health — wearables, labs, and the lived day. Together we're building the largest voluntary map of human health.

Do I need to buy your hardware? No. Keep your stack. We have no desire to pull you into a commercial device ecosystem.

What does it cost? $399/year or $39/month. 30-day trial after data connect.

Do I have to share data for research? No. Membership works fully without research opt-in. When research access creates revenue, participants share in it.

Is this medical advice? No — wellness and self-tracking only.

Encrypted. Never sold. Research opt-in — if it earns, you share. Principles · Privacy