TrailForce
iPhone and Apple Watch · Live on the App Store
Video shows the trail. TrailForce shows how it felt.
A camera catches the view. It misses the 22 degrees of off-camber, the climb that pinned you back in the seat, the moment the truck went light over a ledge. TrailForce records all of it as live telemetry, then plays it back right on top of your footage, so the clip finally matches the drive.
A look inside
What it does
Telemetry on your video
Pitch, roll, speed, G-force, and altitude burned right onto the footage, in real time.
Trail Events
Tap to mark a moment as it happens, then jump straight back to it on playback.
WormHole 3D viewer
Replay your route as a 3D path you can spin and fly through, not just a flat line on a map.
Thrill Score
The app scores how wild a run was, so a gnarly section earns its bragging rights.
Breadcrumb
Drops GPS crumbs offline, on low battery, so you can always retrace the way back.
Apple Watch and GPX
Start and mark from your wrist, and export any run as GPX to take anywhere.
Under the hood
What it took to make a phone feel the trail and put it back on screen.
- AppNative SwiftUI for iPhone, with an Apple Watch companion app
- SensingCoreMotion and CoreLocation fused into one live telemetry stream
- VideoReal-time overlay rendering, syncing the data track to the footage frame by frame
- 3DThe WormHole path viewer, drawing your route in three dimensions
- SafetyOn-device pitch, roll, and G thresholds that can alert an emergency contact
- DataLocal-first recordings, GPX export, offline breadcrumb logging
- HowDesigned and built by asking, in plain words, then testing it in the dirt
TrailForce started as a sentence: I want my video to show how the drive actually felt. Everything here grew from asking for that, one piece at a time. Watch it come together.
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