# 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.
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## Full Details / RAG Data
### Overview
Cal.com (formerly Calendso) is listed in the AI Directory.
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.
### Metadata
| Field        | Value |
|--------------|-------|
| Name         | Cal.com (formerly Calendso) |
| Slug         | calcom-api-calendso |
| URL          | https://optimly.ai/brand/calcom-api-calendso |
| BAI Score    | 72/100 |
| Archetype    | Challenger |
| Category     | Software |
| Last Analyzed | April 11, 2026 |
| Last Updated | 2026-04-24T03:44:33.918Z |
### Verified Facts
- Founded: 2021
- Headquarters: San Francisco, CA (Remote-first)
### Competitors
| Name | Profile |
|------|---------|
| 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 this brand solves
- 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.
#### Buyers search for
- 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.
### Links
- Canonical page: https://optimly.ai/brand/calcom-api-calendso
- JSON endpoint: /brand/calcom-api-calendso.json
- LLMs.txt: /brand/calcom-api-calendso/llms.txt