Independent sync monitor · Airbnb · Vrbo · Booking.com

The double booking is already on your calendar.You just can’t see it yet.

Your channels only sync every few hours, and each calendar link runs one direction. In that window a booking on one channel leaves the same nights wide open on another. Paste your calendar export URLs and find every gap in 30 seconds.

Check my calendars →How it works

No signup · No channel logins · Guest details never touched

Your two calendars, side by side

14 nights

booked open, but booked elsewhere

Airbnb took the booking. Vrbo never got the block. Until the next sync, both calendars will sell the same five nights.

The free check

Cross-check one property’s calendars

Add the export URL for each channel this property is listed on. Two or more, same property. Don’t have them handy? Try it with a sample property first to see exactly what comes back.

How it works

Three steps, no account

Paste your export URLs

Grab the calendar export (.ics) link each channel already gives you. Public, read-only, no login handed over.

We line up every night

All your channels get stacked on one calendar, then cross-checked for any night booked on one but still open on another.

You close the gap

Add the missing reverse import or fix the block, before the next slow sync turns that gap into a real double booking.

Why a separate watchdog

The tool that breaks your sync won’t warn you it broke.

When a channel manager silently drops a block or fails a sync, its own dashboard keeps showing green. That is exactly why this is an independent monitor, not another panel inside the tool that is failing you. It reads the same public calendars your guests’ bookings flow through, and answers to nobody but you.

Read-only. It never writes to your calendars.
No channel logins, no API partnership, no lock-in.
Booked and blocked dates only. Guest data stays private.

“The ‘calendar synch issue’ is an increasingly used excuse and I am angry AF about it.”

r/vrbo · July 2026 · 100 upvotes

“My listings went completely offline on Airbnb. I am losing bookings and money every single day.”

Lodgify review · June 2026

“The migration double-booked guests and cost me around €2,000, plus the negative reviews.”

Lodgify review · June 2026

Always on · free while in beta

The one-time check is free. So is keeping it running.

Continuous monitoring re-checks every channel every hour and emails you the minute a gap opens or a calendar feed goes dark, in the window the channels are still blind. Add your property’s calendar URLs, confirm your email, and leave it running.

Hourly re-checks across all your channels.
Email the moment a new gap or dark feed appears.
No account, no channel logins. Stop from one link.

Founder pricing · paid plans opening soon

When it goes beyond the calendar, lock in the founder price.

The sync-gap monitor stays free. Watchtower is the paid tier that watches the failures your channel manager never surfaces: a listing quietly going offline, or its price and rules rewritten without a word. Reserve your price for when it opens.

$9/ month$15

Founder price, locked for life

Everything in the free monitorHourly cross-channel re-checks and an email the moment a sync gap or a dark feed appears.
Listing-offline detectionKnow within minutes if a listing stops taking bookings or drops off search, not days later when the calls dry up.
Silent-change alertsCatch it when a channel quietly rewrites your price, min-stay, bedrooms, or amenities behind your back.
Your whole portfolio, faster checksWatch every property you run, on a tighter re-check interval than the free tier.