Triathlon · Swim · Bike · Run

Train smarter.
Race better.

Five apps for triathletes, runners, cyclists and swimmers. Each one fixes a real problem in endurance training, runs on your iPhone or Apple Watch, and has one fixed price.

One fixed price · iPhone and Apple Watch · Made for iPhone Duo · Private, no account

More from Headwind Lab

Off the bike, too.

WindWaterSailTides, currents and wind · iPhone and Apple Watch

Know when it's a good time to go.

NOAA tides and currents with wind on one chart, good time to go alerts you control, and live Crissy Field cams.

Visit windwater.app
WindWaterSail: good window on chart
SymboCalcSymbolic calculator · iPhone, iPad and Mac

Exact answers, not just decimals.

A full computer algebra system on your iPhone.

Visit symbocalc.com
SymboCalc: 3d surface

iPhone Duo

Made for iPhone Duo.

Every iPhone app here is built for iPhone Duo. Open it up and you get two columns side by side.

TriCoach: today and week

Open

Half folded

About

Built in the hours before work.

I'm Nils, a triathlete in California. This year I raced the 70.3 World Championship in Nice.

Every app here started as a problem in my own training that I couldn't find a good fix for, so I built one.

Headwind Lab is my small app studio. Besides the training apps, I also make WindWaterSail for wind and water sports and SymboCalc for math.

Everything runs on your phone or watch. No accounts. If something breaks or you want a feature, email me. I read every message.