If you list one property on Airbnb, Vrbo and Hipcamp, you do not have one calendar. You have three, plus whatever you keep yourself, and they agree with each other most of the time. Most of the time is the problem.
The failure looks like this. A guest books three nights on Vrbo. Twenty minutes later a different guest books two of the same nights on Airbnb. Both get a confirmation. One of them is going to get a message from you that starts with an apology, and whichever platform you cancel on is going to record it against you.
The channels give you a file, not an API
The reason this happens is worth understanding, because it changes what you should expect from any tool that claims to fix it.
Airbnb, Vrbo and Hipcamp all publish availability as an iCal feed — the same format a calendar application uses. You give each channel the other channels' feed URLs, and each one goes and fetches the others on its own schedule. That schedule is theirs, not yours. It is measured in tens of minutes to hours, and none of the platforms commits to a number.
What an iCal feed carries is a list of date ranges that are unavailable. What it does not carry is who booked, what they paid, when they booked it, or why a date is blocked. A block you added yourself for maintenance and a block created by a paying guest look identical from the outside.
So a channel manager cannot know your revenue from the calendar feeds. Anyone telling you their software gives you live earnings across channels is either reading your email, asking you to upload the monthly exports, or overstating what the integration does. We reconcile earnings from the monthly channel exports, and we say so on the platform page rather than implying something tidier.
The window is the whole risk
Between a booking landing on one channel and the other channels fetching that channel's feed, your property is genuinely double-bookable. Nothing you buy closes that window entirely, because closing it would require the channels to push rather than be polled, and they do not.
What you can do is make the window short and make it visible.
- Short: sync on a tight cycle rather than waiting for each channel's own schedule, so the gap is measured in minutes rather than hours.
- Visible: know when each calendar last actually synced. Not "sync is enabled" — the timestamp of the last successful fetch, per channel.
That second one is the part most owners never get. A sync that quietly stopped three weeks ago looks exactly like a sync that is working, right up until the morning two guests arrive. We put the last-synced time on the listings screen for exactly this reason, and you can see that screen rather than take our word for it.
What to actually do about it
If you are running this yourself, in rough order of how much grief each one saves you:
Set up the iCal links in both directions on every pair. It is not enough for Airbnb to read Vrbo. Vrbo has to read Airbnb, Hipcamp has to read both, and so on. Three channels means six links. People routinely set up half of them and assume they are covered.
Check the last-sync timestamp weekly. Put it in a recurring reminder if you have to. A broken feed is silent.
Keep a buffer night if your turnovers are tight. A same-day changeover leaves no room for a sync that ran late, and on a remote property it leaves no room for the drive either.
Decide in advance which channel wins. When a double booking does happen, the worst version is you deciding under pressure at 9pm. Know which guest you keep and what you offer the other one before it happens.
None of that is complicated. It is just five things that have to stay true forever, and forever is the hard part when you also have a job.
The honest limit
Two-way calendar sync stops most double bookings and it will not stop all of them. A booking that lands during the window between fetches is a real risk, and any manager who tells you otherwise is selling certainty they cannot deliver.
What good operations look like is a short window, a monitored one, and a plan for the rare case that slips through — not a promise that it cannot happen.
If you have a property doing this to you and you would rather it were somebody else's five things to remember, that is most of what we do.