Observed arrival · 2026-09-28
Passby makes race spectating a timing problem you can solve
A free planner estimates when a runner will pass selected points on a race course, using a target finish time and a race route or GPX file.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Running-race spectators planning where to cheer
- Worth noticing
- Saved spectator points stay in browser storage; share links put route and timing details after a # fragment.
Field notes
The interface includes course distance, ascent and descent, average pace, finish-time estimates, and an option to show the whole course. Spectator points can be saved by name and kilometre; the privacy text says those details remain in browser storage. A share link carries route and timing information in its fragment, while map tiles come from OpenStreetMap after a course is loaded.
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