Foil Run

iPhone · Apple Watch · any GPX

GPS analysis for foiling.

Record on iPhone or Apple Watch and the ride lands in your Logbook, analyzed: wind, climbs, surf runs, maneuvers, and gear. Or bring a GPX from any logger.

DM me for the beta →Analyze a track →Try the live demo

Invite-only · TestFlight

On your wrist

Live VMG on the water.

  • Live upwind and downwind VMG: nearby weather seeds the wind, and your riding sharpens it.
  • Last Wave: the wave you just rode and how long you held it, the moment you kick out.
  • Speed and heart rate at a glance, under Water Lock. One tap to start.
Foil Run on Apple Watch before a ride: a one-tap Start card with the apparatus and the wind already set
Foil Run on Apple Watch showing live speed, upwind VMG, and heart rate during a climb
Foil Run on Apple Watch after a ride: session recap with distance, longest wave, and heart rate

The climb

Laps back upwind, scored.

  • Riding parawing laps? Every climb back upwind is found and scored on its own.
  • Span VMG and effective VMG per climb: your pace with and without the turns.
  • A climb polar of your angles, port and starboard, against a wind you can see.
Map of a detected climb emphasized over the session track, with the speed strip
Climb card showing climb span VMG and effective climb VMG side by side

The downwind read

Every run, top to bottom.

  • Every downwind run found from the track alone: no setup, no course required.
  • On-foil time, glide count, longest glide, and max glide speed for every run.
  • VMG to the bottom, and your path against its smoothed line: running straight or carving hard?
Map of three detected downwind runs with the session speed strip
Run card showing 75 percent on foil, 2 glides, longest glide 838 meters, and downwind VMG

Your season

Proof you are getting better.

  • Lifetime distance, hours on water, and clean-turn rate, always up to date.
  • Compare up to four sessions on one wind-relative polar: did the new gear help?
  • Gear attached to every session. Courses with personal bests when you want a scoreboard.
Foil Run Logbook on iPhone showing all-time distance, sessions, hours on water, maneuver clean rates, and downwind run totals

The debrief

See what every turn costs.

  • Every tack and gybe measured to full recovery: ground lost, time lost, clean rate.
  • A wind estimate you can check and correct: weather-anchored, refined by your tacks.
  • No app required for the debrief: bring a GPX from Strava, Garmin, or any logger.
Foil Run Analyze on iPhone showing a climb with a clean gybe popup: 19 seconds to full recovery and 80 meters of windward progress lost

Built by Wren

Why Foil Run exists

I was a math nerd long before I was a foiler. I wanted to know what gear and techniques actually got me going faster and higher. Foil Run is one regrettably competitive foiler's attempt to make the beach debrief more useful.

Bugs, ideas, and TestFlight:@heart_wrenchmore at wrenchat.work