Cronofy

Cronofy's Calendar API exposes calendar data from the Sync Engine with full CRUD access across all synced calendars. It connects with Google, Microsoft, Apple calendars, and on-premise Exchange with 99.99% service guarantee. The Availability API powers one-to-one meetings to multi-participant round-robin and timezone scheduling through a single endpoint. Cronofy supports multiple calendar access modes including Free/Busy-only for privacy-sensitive environments, allowing availability checking without accessing event details. Automatic conferencing support includes Google Meet and Microsoft Teams. API plans start at $819/month for Emerging plan with unlimited calls and two-way sync.