Interactive · Evidence-first
Longevity Tools
Small, honest, free tools that do one thing well — no sign-up, no data leaving your browser, and the same evidence-first, no-hype read we bring to our graded rankings. Each one shows its working and tells you, plainly, what it can and can't do.
Fitness Age & VO2max Estimator
Estimate your VO2max — one of the strongest predictors of all-cause mortality — without a lab, using the same everyday inputs as the validated HUNT non-exercise model, and translate it into a plain-language 'fitness age'.
Estimate my fitness ageLongevity Test Cost Comparator
Line up TruDiagnostic TruAge, GlycanAge, InsideTracker, Function Health and Galleri on current 2026 price, what each one really measures, and an honest read on what you get for the money. Filter by budget or test type.
Compare the testsHow to read these
Every tool here is educational, not medical advice. They produce estimates and comparisons to help you ask better questions — not diagnoses, prescriptions, or buying recommendations. The math and the data are hard-coded and shown openly, but a population estimate is never a measurement, and a price table is never a substitute for a clinician. If you have relevant health conditions, talk to one before acting on anything you read here.