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Prompt

free busy api for scheduling

Technology / Scheduling & Booking Software1 observationLast seen Oct 15, 2026

Latest observation

Oct 15, 2026OpenAI APIWeb search: off

If you mean an API to check when people are free/busy for scheduling, there are a few good options depending on your stack:

Common calendar APIs with free/busy support

  • Google Calendar API
    Supports freebusy.query to get availability across calendars.

  • Microsoft Graph Calendar API
    Use getSchedule or related schedule endpoints for free/busy lookup in Microsoft 365 / Outlook.

  • CalDAV / iCalendar If you’re integrating with standards-based calendars, you may need to read event data and compute free/busy yourself unless the server exposes availability features.

  • Scheduling platforms with APIs

    • Calendly API
    • Cronofy API
    • Nylas API These often provide higher-level availability scheduling features, including free/busy aggregation.

Best choice by use case

  • Gmail/Google Workspace users: Google Calendar API
  • Outlook/Microsoft 365 users: Microsoft Graph
  • Need multi-provider aggregation: Cronofy or Nylas
  • Need a custom scheduling app: Google/Microsoft APIs directly

Example: Google Free/Busy request

POST https://www.googleapis.com/calendar/v3/freeBusy

If you want, I can give you:

  1. a comparison table,
  2. sample code in Python/Node.js, or
  3. the best API for your exact use case.

Brands

Google Calendar ApiMicrosoft Graph Calendar ApiCalendly ApiCronofy ApiNylas Api

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