Google Calendar + Astrocal:
zero double‑bookings
One OAuth click connects your Google Calendar. Astrocal reads your FreeBusy data in real time, so every slot your clients see is genuinely available.
Calendar conflicts cost you clients
of prospects abandon booking when asked to email back and forth
Every round-trip message is a chance for them to ghost. Self-service booking removes the friction.
lost per week to manual scheduling for the average professional
Checking calendars, proposing times, rescheduling clashes - time that compounds every week.
of meetings double-booked when syncing calendars on a delay
Polling every 5–15 minutes leaves a window for conflicts. Real-time FreeBusy checks close it.
How Google Calendar works with Astrocal
You: Create event types and connect Google Calendar via OAuth
One OAuth screen, under 30 seconds
Astrocal: Reads FreeBusy data in real time
On every slot request, not cached
Client: Books via your link or widget
Picks from genuinely available slots
Google Calendar: New event created automatically
With invitee details and ICS calendar attachment
Integration capabilities
| Capability | Supported | Notes |
|---|---|---|
| Real-time FreeBusy checks | Yes | Reads availability on every slot request |
| Write booking events to calendar | Yes | Created instantly on booking confirmed |
| Multiple Google Calendars | Yes | Check multiple calendars for conflicts on all plans |
| Two-way sync | Partial | External events block availability in real time. Cancellations in Astrocal remove the Google Calendar event. Cancellations made directly in Google Calendar are not yet synced back. |
| Recurring events | No | On roadmap |
| Google Meet links | No | On roadmap |
| Multiple hosts, round-robin | Yes | Each host connects their own Google Calendar |
| Google Workspace accounts | Yes | Personal and Workspace accounts both supported |
| Meeting rooms / resources | No | On roadmap |
Available on all plans including Free.
One OAuth screen. That's the hard part.
Click 'Connect Google Calendar'
You'll be taken to Google's standard OAuth screen. Astrocal requests FreeBusy read access and event write access: the two permissions needed to check availability and create booking events.
Create your first event type
Set a duration, your availability windows, and a buffer between meetings. Astrocal reads your calendar in real time from this point. No additional configuration needed.
Share your booking link or embed the widget
Anyone who books gets a confirmation email. A Google Calendar event is created automatically with the invitee's details.
Pair Google Calendar with Stripe and more
Outlook
Use Microsoft 365? Connect Outlook alongside Google Calendar. Astrocal checks both for conflicts.
Stripe
Require payment at the time of booking. The Google Calendar event is created only after payment clears.
Webhooks
Push booking data to any CRM, Slack, or automation tool via signed webhooks with automatic retries.
We were losing leads to email tag. They'd go cold before we agreed on a time. After connecting Google Calendar to Astrocal, our booking-to-meeting rate jumped from 60% to 94%. Setup took about 30 seconds.
Priya Sharma
Head of Sales, Relay
Frequently asked questions
Connect Google Calendar in 30 seconds
Real-time sync on every plan. Free to start, no credit card required.