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Coss

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Updated: 15 Jan 2026
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coss.com is the new holding company of cal.com, the pioneers of open source scheduling infrastructure and cal.com continues to be the 'google search' of our alphabet.

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Overview

Coss.com has emerged as a dynamic holding company for cal.com, setting its sights on revolutionizing how open source scheduling infrastructure is leveraged. The aim is clear: to cultivate a thriving ecosystem for remarkable open source projects, giving them the necessary support for growth and innovation. At the heart of this mission is the coss stack, a singularly packaged npm install that encompasses a myriad of crucial functionalities for modern application development, from scheduling and notifications to SMS and video conferencing.

The repository itself is structured as a monorepo, housing multiple interconnected applications and packages designed to work seamlessly together. This organized approach not only enhances usability but also allows for efficient management of dependencies and environment setup, making it an attractive choice for developers looking to streamline their workflows.

Features

  • Comprehensive Ecosystem: The coss stack provides an all-encompassing package, integrating essential services like email, SMS, calendar APIs, and more into a single npm install.
  • TypeScript Powered: Each application within the repository is built entirely on TypeScript, ensuring strong typing and reducing runtime errors.
  • User-Friendly UI Components: The coss ui library offers beautifully designed, accessible, and composable components specifically crafted for React applications, allowing for quick and straightforward integration.
  • Legacy Support: Includes the legacy Origin UI components for those who prefer Radix-based design elements, with continued availability and some maintenance.
  • Robust Development Setup: Utilizes Turborepo for efficient development processes, supporting both local and production environments through adjustable environment variables.
  • Open Source Contributions Encouraged: The project welcomes contributions from the community, promoting collaboration and improvement of the library.
  • Focus on Modern Design: Built on top of the Base UI and styled with Tailwind CSS, the components come ready to use, bringing modern aesthetic and functionality to web applications.