Foil RunAlpha

Advanced analysis for your time on foil.

GPS analysis for parawing, wing, and downwind SUP. Unpack your climbs, turns, and runs. See what changed when you switched gear.

Free to use. Record with the app or bring a GPX or FIT file.

A parawing session in Foil Run: the Hatchery track with five linked turns highlighted, session highlights, and the wind compass
Explore sample sessions

iPhone + Apple Watch On the App Store

Know how you’re going, while you’re going.

See how quickly you’re gaining ground upwind and how far that last wave took you. Record on your Apple Watch, then relive the session on your iPhone or the web.

The wind keeps shifting. We keep learning.

Your Watch uses forecasts and past rides to estimate the wind before you get going. Then it refines that estimate from your actual riding, picking up local shifts a forecast can miss.

Apple Watch showing live upwind VMG of 5.8 knots during a climb, with speed, heart rate, and distance
Live upwind VMG
Apple Watch showing the last wave immediately after kick-out: one minute forty-two seconds and 512 metres
Last Wave
Apple Watch recording a voice note about the rider’s gear, wind, and goals
Say your setup
Apple Watch session recap showing 24.7 kilometres, the longest wave, session time, and heart rate
The recap

Tap the mic for a setup note before you head out, and a recap when you’re done. Your notes stay with the ride.

See how your ramble becomes gear details
Download on the App Store

Free, for iPhone and Apple Watch.

You bring the stoke. We’ll sort the details.

A quick ramble about your setup. A recording that ran long. Foil Run helps turn both into a tidy Logbook, while you’re still buzzing.

Talk gear to me.

Say it how you’d say it on the beach. With AI voice notes on, Foil Run matches your ramble to your quiver and the gear catalog, then tags the gear it recognizes. No need to recite the full model name.

“Okay, I have the Armstrong, let’s see, 690 on.”
Front foil
Armstrong MA Mk II
Size
690 cm²

Your drive home isn’t a PB.

Forgot to stop recording? Foil Run can automatically trim the land travel before and after your ride, so your drive home doesn’t steal the show.

Keep the ride, trim the land travelAn illustrated recording has a solid teal route on the water. Dashed grey travel before and after the ride is trimmed from the analysis. The original recording stays intact.

Find the story in your session.

That climb that felt quick. The tack that cost you. The run you wanted to keep going. Foil Run turns your GPS track into a closer look at the ride.

The run back down

See your distance, time on foil, and fastest kilometre. Take a closer look at linked turns and standout carves.

Rufus Run 1 with its two-turn streak highlighted on the full-run map and both turns shown together in the detail insetRufus Run 1 summary with distance, time on foil, elapsed time, fastest kilometre, turn counts, longest chain, and Shred Score

A little evidence for the gear debate.

Was it the foil, the wing, or just a very good Tuesday? Keep your setup with each ride and start figuring out what works for you.

Meet your Wingprint

Get a feel for a sail’s upwind performance across the rides you’ve logged with it.

The current Wingprint for Wren’s Ozone Pocket Rocket V1, showing 374 spans and 74 climbs from 28 sessions

All those sessions add up.

Your rides, spots, and setups, all in one Logbook. Look back on a season of more water time, longer rides, and turns you’re starting to nail.

More water time. Cleaner gybes. Progress has more than one number.

The current Foil Run season view: Wren’s distance logged, 90 sessions, hours on water, and tack and gybe clean-turn rates

Same water. Friendly rivalry.

Set a Course at your spot. Chase a personal best, compare rides with friends, and give the next session a little friendly competition.

Race the clock upwind. Compare speed and Shred Score downwind. There’s more than one way to have a good run.

The current public Swell City to Hatchery Point Course: two river gates and the parawing Shred leaderboard with scores, carves, and linked-turn results
Shred Score Preview

Make your turns count.

Link carves. Build combos. See how your downwind line adds up. Shred Score gives you something to chase besides speed.

For parawing and downwind SUP Courses.

See how Shred Score works
A silent Share reel from the public Rufus downwind SUP example. Two highlighted excerpts show detected turns over satellite imagery, with a turn-rotation dial, ending with full-run headline metrics.

Help shape what we measure next.

There’s more to a ride than speed and distance. We’re developing new ways to combine GPS and motion sensors to understand foiling, and looking for early alpha partners to help test ideas against real riding.

Tell us what you ride, which devices you use, and what you’d like to understand better:

Freestyle: jumps, rotations, tricks, and landings.

Surfing: waves, turns, and connections.

Downwinding: cruising, linking bumps, and longer runs.

Racing: speed, efficiency, starts, and course performance.

Dockstarts and pumping: getting going, staying up, and distance.

As new algorithms become ready to test, there may be opportunities for early access and to work directly with me on questions from your own riding.

Your devices

The iPhone + Apple Watch app is on the App Store. The Garmin app is in beta; register here to apply. Other platforms aren’t ready; GPX and FIT analysis works on the web.

What do you ride?

Optional. Select all that apply.

What would you like to explore?

Optional. Select all that apply.

Testing may include early access to new algorithms or Android/Garmin builds when available, sharing selected tracks, recording with additional sensors, or chatting about your sessions. Session data follows your Help Improve settings and report donations.

How Wren can reach you

Enter an email address, an Instagram handle, or both.

By registering, you ask Foil Run to use these details for device support and alpha planning and contact you about opportunities at the email or Instagram handle you provide. To change your details or withdraw your request, contact privacy@foil.run. Privacy