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Cal.com
The open-source scheduling infrastructure that gives you full control over your data and booking experience.
What it does
Provides a white-label scheduling platform with bi-directional calendar sync. Offers a comprehensive API and SDK for building custom booking workflows. Supports complex routing logic, round-robin scheduling, and team event types. Features 'Cal Video' for integrated video meetings and recording. Enables self-hosting for maximum security and compliance (HIPAA, SOC2).
Why it works
Flexibility: Open-source nature allows developers to modify the code to fit any specific business logic. Privacy: Ideal for industries requiring strict data control by allowing on-premise hosting. Interoperability: Integrates with almost any stack via a powerful API-first architecture. Cost-Effectiveness: Offers a generous free tier for individuals while providing enterprise-grade infrastructure.
Category: Productivity
Team Size: 33
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As of 2026
Productivity
Revenue: $1M-$10M ARR
The open-source scheduling infrastructure that gives you full control over your data and booking experience.
Overview
Cal.com (formerly Calendso) is a developer-friendly, open-source scheduling platform designed to be a highly customizable alternative to Calendly. It provides a robust API and a suite of embeddable booking tools that allow businesses to integrate professional scheduling directly into their own products. By prioritizing data sovereignty and offering self-hosting options, it has become the standard for privacy-conscious organizations and tech-forward startups.
Funding status: Funded
Revenue source: Subscriptions & API Usage
Customer type: B2B2C
Pricing: Freemium
Tech stack: Next.js, TypeScript, Prisma, PostgreSQL, AWS
Platform: Web • API
Integrations: Google Calendar, Outlook, Zoom, Stripe, HubSpot, Zapier
Founder story
Founded in 2021 by Peer Richelsen and Bailey Pumfleet. Peer, a serial entrepreneur, and Bailey, who started building the core code at age 17, wanted to create a scheduling tool that wasn't a 'black box.' They turned a side project into a global movement, raising over $30M to build the 'Stripe for scheduling.'
What it does
- Provides a white-label scheduling platform with bi-directional calendar sync
- Offers a comprehensive API and SDK for building custom booking workflows
- Supports complex routing logic, round-robin scheduling, and team event types
- Features 'Cal Video' for integrated video meetings and recording
- Enables self-hosting for maximum security and compliance (HIPAA, SOC2).
Who it's for
- SaaS Developers
- Healthcare Providers
- B2B Sales Teams
- Indie Hackers
Why it works
- Flexibility: Open-source nature allows developers to modify the code to fit any specific business logic
- Privacy: Ideal for industries requiring strict data control by allowing on-premise hosting
- Interoperability: Integrates with almost any stack via a powerful API-first architecture
- Cost-Effectiveness: Offers a generous free tier for individuals while providing enterprise-grade infrastructure.
Growth strategies
- Leveraged a 'Community- First' approach on GitHub to build a massive contributor and user base.
- Positioned as the 'Privacy- First' alternative to capture users from regulated industries.
- Successfully utilized a Series A round to launch 'Cal.ai,' an AI- powered scheduling assistant.
- Built a 'Platform' model, allowing other SaaS tools to use Cal.com as their core booking engine.
Alternatives
Comparison overview
- Calendly: The market leader; Cal.com is the open-source, more customizable alternative for developers.
- SavvyCal: Great for UI; Cal.com is better for technical teams requiring deep API integration.
- Cal.com is the premier choice for organizations that need a scheduling engine they can truly own.