Biological age34Real age 39
Reaction time241 ms29-year-old level
Balance18 s41-year-old level

Early access · Biological age test

How old is your body, really?

A 6-minute phone test measures your reaction speed, balance, hearing range, voice and face, then tells you your biological age and what's driving it.

How it works
6 minutesJust your phone
5 measuresReaction to face
RetestTrack it monthly

A new approach

Stop counting birthdays. Measure what matters.

×The old way
  1. Step 1Count birthdays
  2. Step 2Yearly checkup
  3. Step 3Wait for symptoms
  4. Step 4Pay $300+ for lab tests
  5. Step 5No way to track
✓The new way
  1. Step 16-minute phone test
  2. Step 25 markers measured
  3. Step 3Your biological age
  4. Step 4A plan to lower it
  5. Step 5Retest monthly

Why it matters

How you move, hear and look predicts how you're ageing, sometimes better than the date on your passport.

Grip strength

Weaker grip strength predicted mortality more strongly than systolic blood pressure across 17 countries.

Leong et al. (2015), The Lancet

Ten seconds on one leg

Middle-aged and older adults who couldn't stand on one leg for 10 seconds had a higher risk of death.

Araujo et al. (2022), British Journal of Sports Medicine

Walking speed

Gait speed was associated with survival in older adults.

Studenski et al. (2011), JAMA

Looking your age

How old twins looked to others predicted which twin lived longer.

Christensen et al. (2009), BMJ

What we measure

Five tests, one number

Each test is scored against people your age and sex, then combined into your biological age.

  • 241 msReaction speedTap test · 30 seconds
  • 18 sBalancePhone motion sensors
  • 15 kHzHearing rangeTone test with headphones
  • VoiceRecording analysis
  • FaceSelfie analysis
  • 1.3 m/sWalking pacePhone in your pocket

Your report

See what's ageing you fastest

Biological age34Real age 39
Your number, compared with your real age.
Weakest markerBalance41-year-old level
What's ageing you fastest, ranked.
Plan · month 1Balance5 minutes a day
A plan to bring the number down, with monthly retests.

Early access

One number that shows how you're really ageing.

$49$19

Founding price, includes 3 retests. Lab-based biological age tests cost $300 or more.

Questions

How can a phone measure my age?

Reaction time, balance, the highest pitch you can hear, your voice and your face all change measurably with age. We combine them into one estimate.

Is this a medical test?

No. It's an estimate for curiosity and motivation, not a diagnosis.

Can I lower my number?

Many of the measures respond to sleep, exercise and training. Your plan targets the biggest gaps, and retests show progress.

When does it launch?

We're opening in small batches. Join now to be first in line at the founding price.

Your birthday says one thing. Your body might say another.