Kosei: Precision Health

Kosei brings rigor to longevity. Most “health advice” is noise — headlines, stacks, and vibes. Kosei is the experimentation app that lets you pull your health data together, pick a real intervention, and see whether it actually moved the needle for you — or didn’t. Ingest data from the sources you already use. Choose what to try. Track the markers that matter. Get a clear read on efficacy across nutrition, training, sleep, supplementation, and whatever else you want to test in the life you already have. This isn’t a clinic. You’re not a patient. You’re running n=1 on yourself with the science that already exists — so you stop guessing. Longevity as a service. Your personalized human optimization engine. Membership Membership is $99/year, billed annually, auto-renewable. It includes the full Kosei app for one year: Live, Train, Nutrition, Evidence, Experiment, and Coach K. Payment is charged to your Apple ID. The subscription renews each year unless cancelled at least 24 hours before the current period ends. Manage or cancel anytime in Settings → Apple ID → Subscriptions. Terms of Use: https://kosei.app/terms Privacy Policy: https://kosei.app/privacy