Free tools for endurance athletes.

Calculators and AI video analyzers. No sign-up, nothing to install - everything runs in your browser.

Bike Fit Analyzer

Film yourself pedaling, get your saddle & reach graded.

Running Form Analyzer

Film yourself running, get your cadence & form graded.

Pacing & performance

Pace ConverterPace ↔ speed, any unit Race Time PredictorPredict times from a recent race Triathlon Split CalculatorSplits, Sprint to Ironman VDOT CalculatorVDOT score + training paces Heart Rate ZonesYour five HR zones in bpm

Training load

FTP CalculatorFTP + cycling power zones Swim CSS CalculatorCritical Swim Speed + zones TSS CalculatorTraining Stress Score, any sport Weekly Volume PlannerPeriodized week-by-week plan Brick Workout GeneratorBike-to-run brick sessions

Race day

Race Nutrition PlannerCarbs, fluid & sodium for race day Sweat Rate CalculatorMeasure fluid loss Race Weight CalculatorYour ideal racing weight Race Day ChecklistPrintable gear list

Built for serious athletes.

Connect your apps in two minutes. Get your first coaching message today. Cancel whenever.

Meet your new coach →Watch 1-min demo

Used by runners, cyclists, and triathletes worldwide