Your biological age,
in one number.

Seven signals science links to a longer life.

Each one is independently tied to how long — and how well — you live. Longevity Arc reads them from data your devices already collect and blends them — with more optional signals like SpO₂, VO₂ and strength — into one composite Arc Score.

• 1HRV resilience — how well your nervous system recovered overnight, versus your personal baseline.
• 2VO₂ max fitness — cardiorespiratory capacity, one of the strongest predictors of lifespan.
• 3Sleep recovery — duration and efficiency merged into how restorative last night really was.
• 4Gait speed — walking pace, a quietly powerful marker of healthy aging.
• 5RHR trajectory — resting heart rate trend, surfacing cardiac stress before you feel it.
• 6Blood pressure — systolic & diastolic readings, a core cardiovascular longevity marker.
• 7Respiratory rate — overnight breathing rate; a rising trend is an early stress or illness flag.