Observed arrival · 2026-09-16

Dualtrail Turns Two GPX Files Into a Race Replay

dualtrail.run Observed source

Editorial interest 84/100 Selection signal · not a rating of the site

A browser tool that aligns two runners’ GPX tracks on 3D terrain, compares their progress, and exports a vertical replay video.

Landing page captured for the 2026-09-16 issue.

Field notes

The tool accepts two GPX tracks, aligns them with optional start-offset and official-finish adjustments, and presents synchronized race statistics alongside a map replay. Its export workflow is aimed at portrait social video, with choices spanning 10–30 fps, 60x–480x playback, several camera behaviors, and resolutions up to 2160×3840. The page also exposes segment results and lets users copy a caption after preparing a clip.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

One card from the complete issue

Wiring Is Not Learning

428,563 arrived 1,000 judged 985 catalogued Enter the complete issue