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.