# Cal.com (formerly Calendso)
> Cal.com (formerly Calendso) is an open-source scheduling infrastructure that enables users to build their own booking workflows. It provides an API-first approach, allowing for deep integration into existing applications while maintaining privacy and data sovereignty through self-hosting options.
- URL: https://optimly.ai/brand/calcom-api-calendso
- Slug: calcom-api-calendso
- BAI Score: 72/100
- Archetype: Challenger
- Category: Software
- Last Analyzed: April 11, 2026
## Competitors
- Calendly (https://optimly.ai/brand/calendly)
- Chili Piper (https://optimly.ai/brand/chili-piper)
## Also Referenced By
- Calendly Developer Api (https://optimly.ai/brand/calendly-developer-api)
## Buyer Intent Signals
Problems: Manual Email Coordination: Manually coordinating times via back-and-forth emails or text messages. | Shared Spreadsheets: Using shared spreadsheets or static documents to track availability. | Status Quo Inefficiency: Accepting the friction of scheduling delays and potential double-bookings.
Solutions: open source calendly alternative | scheduling api for developers | white label booking system for enterprise | self-hosted scheduling software | Basic Calendar Built-ins: Utilizing the basic built-in booking features of Google Workspace or Outlook without advanced logic.