If you want appointment booking with webhooks, the best choice depends on whether you want an all-in-one scheduling tool or a custom-built workflow. Here are the strongest options:

Best all-around: Calendly

Use Calendly if you want something quick, reliable, and widely supported.

• Easy setup for booking pages
• Supports webhooks for booking events
• Works well with Google Calendar, Outlook, Zoom, Stripe, CRMs, etc.
• Good if you want automated notifications or to trigger workflows when an appointment is booked/canceled/rescheduled

Best for: teams, sales, client calls, simple automation.

Best for more control: Cal.com

Use Cal.com if you want more flexibility and customization.

• Open-source and highly customizable
• Supports webhooks
• Can self-host if needed
• Good for developers who want to build scheduling into their product

Best for: startups, SaaS products, custom integrations.

Best for Google Workspace users: Google Calendar + automation tools

If you already use Google Calendar heavily, you can combine it with:

• Zapier
• Make
• n8n
• Custom webhook processing

This is less of a booking product and more of an automation setup.

Best for: lightweight workflows and internal tooling.

Best for enterprise / complex scheduling

Consider:

• Acuity Scheduling: strong scheduling features, forms, payments, reminders
• Microsoft Bookings: good if you’re in Microsoft 365
• SimplyBook.me: more feature-rich for service businesses

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My recommendation

• Choose Calendly if you want the simplest reliable option.
• Choose Cal.com if you want webhook-driven customization and developer control.
• Choose Acuity if you need more business-style booking features.

If you want, I can also give you:

1. a comparison table, or
2. the best option based on your use case (SaaS, agency, clinic, internal scheduling, etc.).