Free health tools and calculators

Track, calculate, and understand your health data.

Face age

Scan your face with your camera and see how old you really look

Your daily energy needs, TDEE-based

Target intake by body weight and goal

Community-tested longevity cooking

Fitness age from a simple field test

Benchmark your hand strength by age and sex

Insulin resistance from fasting labs

Light windows and melatonin timing, day by day

Lifestyle check: how fast are you aging?

Symptom self-assessment, STRAW-based

Check health claims against the evidence

What should we build next?