best alternative to Google Calendar API for app scheduling

If you want an alternative to the Google Calendar API for app scheduling, the “best” choice depends on what you need most: easy scheduling, calendar sync, booking links, developer-friendly API, or self-hosting/privacy.

Top alternatives

1. Microsoft Graph Calendar API

Best for: apps used in enterprise/Office 365 environments

• Accesses Outlook/Exchange calendars
• Strong API, good documentation
• Great if your users are on Microsoft 365

Pros: enterprise-ready, reliable, OAuth support
Cons: mainly tied to Microsoft ecosystem

---

2. Calendly API

Best for: scheduling meetings/appointments quickly

• Very easy to use for booking workflows
• Includes availability, event types, scheduling links

Pros: fastest to implement, great UX
Cons: not a full general-purpose calendar API; more of a scheduling platform

---

3. Cal.com API

Best for: open-source scheduling and self-hosting

• Open-source alternative to Calendly
• API for availability, booking, and event management
• Can self-host for more control

Pros: flexible, privacy-friendly, customizable
Cons: less mature than Google/Microsoft ecosystems

---

4. Cronofy Calendar API

Best for: unified calendar integration across providers

• One API for Google, Microsoft, Apple/iCloud, and others
• Good for scheduling apps that need multiple calendar connections

Pros: single integration layer, strong scheduling features
Cons: paid service, not as cheap/simple as native APIs

---

5. Apple EventKit / iCloud

Best for: Apple-first apps

• Good for iOS/macOS apps accessing local calendars
• Not ideal as a universal backend calendar API

Pros: native Apple integration
Cons: limited for cross-platform server-side scheduling

---

Best pick by use case

• Enterprise / Outlook users: Microsoft Graph
• Meeting booking app: Calendly or Cal.com
• Multi-calendar integration: Cronofy
• Apple-only app: EventKit
• Need self-hosted / open source: Cal.com

My recommendation

If you want the closest practical alternative to Google Calendar API for app scheduling:

• Microsoft Graph if your users are mostly business/Office users
• Cronofy if you need one API across many calendar providers
• Cal.com if you want open-source scheduling control

If you want, I can also give you:

1. a feature-by-feature comparison table, or
2. the best choice for your specific app type.