The room always opens up eventually.
Sold-out rooms and permits come back — briefly. modsignal watches the booking page and catches the window when it opens.
Get startedA cabin opened at Phantom Ranch for October 9–10 — first availability since March.
What modsignal extracts
- Room and site availability
- Nightly rates and fares
- Permit windows
- Date-range openings
The room is sold out, the campsite permits are gone, the fare is absurd — today. Availability leaks back constantly: cancellations return to inventory, new permit windows open, fares reprice overnight. The people who get those slots are the ones who happened to look at the right moment.
modsignal looks every few hours, or every few minutes when it matters, at the actual booking page: the hotel's own site, the permit portal, the fare page. Tell it your dates and your threshold — a room for Aug 14–17, permits for October, this route under $400.
When something opens, the alert says exactly what and quotes the page, so you can book from your phone before it's gone again. Booking pages are heavy with calendars and scripts, which is what the browser-agent tier is for — it renders the page in a real browser before reading it.
Cancellation slots at popular places reappear at unpredictable hours and vanish in minutes, so this is the use case where fast intervals genuinely pay for themselves. Set the monitor, close the tab, and let the one alert that matters find you.
Set up a travel monitor.
Write the prompt, set the interval and get the first alert when something actually changes.