Calendar InvitationsThat Actually Work

ScheduCal is a fully managed calendar invitation service. Call 3 API endpoints, implement one webhook, and we handle all the infrastructure. Invitations delivered correctly to every calendar — Outlook, Google, Apple, and any CalDAV client.

Calendar Invitations Were Broken for Years

Many scheduling platforms don't implement calendar invitations correctly. The result: customers see duplicate appointments when times change, cancellations that don't actually remove events, or invitations that never arrive at all.

The problem is technical: ICS files require persistent UIDs and proper SEQUENCE tracking (RFC 5545). Most platforms skip these details, and their customers don't know why calendar invitations behave inconsistently.

ScheduCal implements the standard correctly — and we've built a managed service around it so you don't have to worry about the details.

3 API Calls. One Webhook. Done.

Replace the complexity of Exchange/Graph integration with a simple API. No Azure AD setup. No OAuth flow. No Exchange infrastructure to maintain.

1

Create Appointment

POST to our API with attendee details, time, and location. ScheduCal delivers the invitation correctly to every calendar system.

2

Update or Cancel

Call Update or Cancel at any time. Changes propagate correctly — attendees see the updated event, and cancellations actually remove it.

3

Receive Responses

Implement one webhook endpoint. ScheduCal sends you attendee accept/decline/tentative responses as they arrive.

Why ScheduCal?

We handle the infrastructure. You focus on your product.

Universal Delivery

One API reaches every calendar system. ScheduCal handles the complexity of cross-platform delivery — Google Calendar, Apple Calendar, Outlook, and all CalDAV clients receive invitations correctly.

Invitations That Actually Arrive

Correctly implemented calendar invitations just work. Updates replace the original appointment. Cancellations actually remove events. No duplicates, no ghost entries.

No Infrastructure. No Complexity.

No Azure AD registration. No OAuth configuration. No Exchange infrastructure for your team to manage. Just an API key.

Not Sure If Your Invitations Work Correctly?

Many platforms send calendar invitations that appear to work — until appointments get rescheduled. Then customers see duplicates, missed updates, or cancellations that don't actually remove the event.

Free ICS Implementation Audit

We'll analyze your current calendar invitation implementation and identify issues:

  • •Missing or incorrect UID implementation
  • •SEQUENCE tracking problems
  • •VTIMEZONE errors
  • •PARTSTAT handling issues
  • •Cancellation implementation gaps

Request a free audit at info@scheducal.com — we'll show you exactly what's broken and how to fix it.

Implementation Fix Service

Already know you have issues? We can fix your ICS implementation:

  • •Add persistent UID tracking to your database
  • •Implement proper SEQUENCE incrementing
  • •Fix VTIMEZONE blocks and timezone handling
  • •Correct email MIME structure for calendar invitations
  • •Handle cancellations properly

Or switch to ScheduCal and let us handle all of it — no code changes needed.

Perfect For Any Scheduling Use Case

  • Appointments and consultations
  • Webinars and virtual appointments
  • Conference talks and meetings
  • Restaurant reservations

Ready to integrate in minutes?

3 API calls, one webhook. Sign up for a free sandbox account with 50 active appointments and see how fast calendar invitations can be.