Real Time Availability Sync Across Platforms
A Make scenario syncs your availability across Calendly, Google Calendar, Outlook, and your website booking widget every five minutes. When a slot is booked anywhere, all other platforms update automatically, so double bookings stop happening.
The Problem
You use Calendly for online bookings. Google Calendar for internal meetings. Outlook for everything your firm sends by email. And there's a booking widget on your website that knows about none of it.
31% of professionals get double booked at least once a month. Each incident burns roughly 45 minutes: the awkward phone call, the apology, the scramble to find another slot, the rebooking. For a real estate agent juggling three or four scheduling platforms at once, that's not a monthly annoyance. It's a weekly one.
The damage goes beyond wasted time. 76% of clients say a double booking would make them consider switching providers. One scheduling mistake and the trust you spent months building evaporates in a single phone call.
Most people think they've solved this. Calendly connects to Google Calendar natively. Google Calendar can sync with Outlook. But these are chain syncs with delays of five to fifteen minutes end to end. And your website widget? It sits completely outside the chain. So a client books a Tuesday afternoon showing on your site while someone else grabs the same slot on Calendly, and you don't find out until both of them show up.
How It Works
A Make scenario runs on a five minute cycle, pulling availability from every platform you use and keeping them all in lockstep. Here's the process, step by step.
1. Scheduled trigger fires
Every five minutes, the Make scenario activates automatically. No manual input required. On Make's Core plan (around $10 per month), five minute intervals are the standard polling frequency.
2. Pull bookings from all platforms
The scenario queries the Calendly API, Google Calendar API, and Microsoft Outlook Graph API in parallel. It retrieves all events and bookings created or modified since the last sync cycle. Your website booking widget's data is pulled via its API or a webhook listener.
3. Compare and detect changes
Make's data comparison modules identify new bookings, cancellations, and modifications across all sources. A deduplication check prevents sync loops, so a meeting booked through Calendly that also appears in Google Calendar isn't counted twice. Attendee email matching handles this.
4. Block time on all other platforms
When a new booking is found on any platform, the scenario creates a corresponding time block on every other connected calendar. Only the time slot is blocked. Private event details (like a personal medical appointment on your Google Calendar) stay private.
5. Sync cancellations bidirectionally
If a booking is cancelled on one platform, the corresponding blocks are removed from all others. The freed slot becomes available everywhere within the next sync cycle.
6. Update your website widget
Your website's booking widget receives the updated availability data via API call. Visitors to your site only see slots that are genuinely open across all your calendars.
7. Log and flag conflicts
Every sync is logged. If two bookings land in the same slot during the five minute window between polls (rare, but possible), the scenario flags the conflict and sends you an alert through Slack or email so you can resolve it immediately.
Why Native Sync Falls Short
Calendly's built in calendar sync is good. It checks your connected Google or Outlook calendar before displaying available slots to bookers. But it only knows about calendars you've explicitly connected to Calendly. Your website widget is invisible to it. So is the portal booking system your real estate agency uses, or the patient portal your medical practice runs.
Then there's the chain sync problem. Say you connect Calendly to Google Calendar, and Google Calendar to Outlook. A booking on Calendly takes two to five minutes to appear in Google Calendar. Then another fifteen to thirty minutes to reach Outlook. That's potentially 35 minutes where Outlook shows a slot as free when it's already taken.
A financial adviser books a client meeting through Outlook at 2pm. Twelve minutes later, before the chain sync reaches Calendly, a prospect books the same 2pm slot through the website. Both get confirmation emails. One of them is about to get a very unprofessional phone call.
The centralised sync approach eliminates the chain entirely. Every platform is checked against every other platform in a single five minute cycle. No daisy chaining. No blind spots.
What This Looks Like for Different Industries
The core automation is the same, but the platforms it connects vary by industry.
Real Estate
Agents typically manage showings through listing platforms (realestate.com.au, Domain), a personal Calendly or Cal.com link for direct bookings, and Google Calendar for everything else. After implementing multi platform sync, agents report a 50 to 70% reduction in scheduling conflicts. That's fewer embarrassing calls to buyers who drove 40 minutes to a showing that got cancelled.
Legal and Accounting
Firms run on Outlook. Clients book through the website. Partners keep personal calendars on Google. Three separate systems, none of which talk to each other by default. A five minute sync cycle catches conflicts before they become missed client meetings or, worse, missed court appearances.
Medical Practices
Practitioners working across multiple locations often maintain separate calendars for each site. A patient portal handles online bookings. The sync ensures that when Dr Chen books a theatre slot at the North Shore clinic, her Parramatta afternoon appointments adjust automatically.
The Business Impact
Take a four person financial advisory practice. Each adviser bills at $350 per hour and sees an average of six clients per day. With 31% of professionals experiencing double bookings monthly, that's at least one incident per adviser per month. At 45 minutes wasted per incident, that's three hours per month across the team. In billable time, that's $1,050 per month or $12,600 per year.
But the real cost is client attrition. If 76% of double booked clients consider switching providers, and each adviser double books even once a month, you're putting four client relationships at risk every single month. Lose just one $15,000 per year client and the cost dwarfs the time calculation.
The automation runs on Make's Core plan at roughly $10 per month. Setup takes a few hours. The maths isn't complicated.
- Double bookings eliminated across all scheduling platforms within five minute sync cycles
- 45 minutes recovered per prevented incident, per team member
- Client trust preserved by removing the most common scheduling failure point
- Website booking widget finally reflects your actual availability
- Cancellations sync bidirectionally so freed slots become bookable everywhere
- Conflict alerts catch the rare edge case where two bookings land in the same five minute window
Frequently Asked Questions
Calendly already syncs with my Google Calendar. Why do I need this?
Calendly's native sync covers one connection. It knows about Google Calendar, but it doesn't know about your website's booking widget, your Outlook calendar, or any listing platform you use. This automation creates a single source of truth across every platform. If a slot is taken anywhere, it's blocked everywhere.
What happens if two people book the same slot within the five minute window?
It's rare, but possible. The scenario includes conflict detection. If two overlapping bookings appear during the same sync cycle, it flags the conflict and sends you an immediate alert via Slack or email. You resolve it manually, but you find out in minutes rather than when both clients arrive.
Will this expose my private calendar events to other platforms?
No. The sync only blocks time slots. It doesn't copy event titles, descriptions, or attendee details between platforms. A personal appointment on your Google Calendar shows up as a blocked slot on Calendly, not as "Dr Martinez, 10:30am."
Does this work with iCloud Calendar?
iCloud has very limited API access compared to Google and Outlook. Direct integration is difficult. The workaround is to sync iCloud with Google Calendar using Apple's built in settings, then include Google Calendar in the automation. It adds one extra link in the chain, but the five minute polling cycle keeps it current.
Can this handle multiple team members, not just one person?
Yes. Each team member gets their own sync scenario (or a single scenario handles multiple users with iterator modules). Each person's calendars are synced independently, so booking a slot with one adviser doesn't block the same slot for their colleagues.
Do we really need automation for this? We just check our calendars manually.
You do, when you remember. But your website's booking widget accepts appointments at 9pm on a Sunday. Calendly takes bookings while you're in a meeting. The whole point is that clients book when you're not looking. Manual checking only works during business hours when you're at your desk, which is exactly when you're least likely to get double booked anyway.
How long does this take to set up?
Most setups are completed within a few hours, including connecting APIs, configuring the deduplication logic, and testing the sync cycle. If you want to see how this would work with your specific set of platforms and calendars, book your free audit and we'll map it out.
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