Reference · Side-by-side
Pick two. Read them together.
The most-asked longevity question is "should I track X or Y?" These pages put two markers next to each other so you can read what each measures, what guidelines say, and how often each should be tested — without flipping between tabs.
Featured comparisons
ApoB vs Lp(a)
Which cardiovascular marker should I focus on?
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HbA1c vs HOMA-IR
Which earlier-signal metabolic marker is right for me?
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VO₂max vs Grip strength
Cardiovascular fitness or muscular strength — which predicts mortality more?
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HRV vs Resting HR
Two wearable signals — what does each actually tell me?
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Or pick your own
Pick two markers above to see them side-by-side.