Interactive calculators and assessments for personal performance. No accounts required, no data harvesting. All free, all open methodology.
Additional tools in active development. Subscribe to the newsletter for first access when they launch.
Optimal bedtime calculator based on chronotype, age, and target wake time. Sleep cycle science included.
Caffeine half-life calculator. Inputs: caffeine consumed, body weight, target wake time. Outputs clearance curve.
Daily HRV interpretation tool. Inputs: morning HRV, baseline, sleep, training load. Outputs recovery readiness.