====== Cal.diy ======
**Cal.diy** is an MIT-licensed open-source fork of [[cal_com|Cal.com]]'s scheduling platform codebase, created to provide self-hosted and hobbyist access to calendar and scheduling functionality following changes to Cal.com's licensing model. The project maintains the core scheduling capabilities of the original platform while enabling community-driven development and deployment outside of Cal.com's proprietary infrastructure.

===== Overview =====
Cal.diy emerged as a community-maintained alternative to [[cal_com|Cal.com]]'s commercial scheduling platform. The fork preserves the open-source accessibility of the original codebase under the MIT license, allowing individual developers, small teams, and organizations to deploy and customize the scheduling system without reliance on Cal.com's managed service. This approach maintains separation between the open-source community version and Cal.com's production environment, which underwent architectural changes including rewritten authentication systems and proprietary billing mechanisms (([[https://alphasignalai.substack.com/p/calcom-closed-its-source-code-heres|AlphaSignal - Cal.diy and the Evolution of Open Scheduling Platforms (2026]]))

===== Technical Architecture =====
Cal.diy retains the core scheduling platform architecture from its [[cal_com|Cal.com]] origin, enabling users to manage calendar availability, booking workflows, and scheduling integrations. The MIT license permits modification, distribution, and commercial use under standard open-source terms. The platform's design supports self-hosted deployment, allowing users to maintain full control over their scheduling infrastructure without cloud-based dependencies or third-party service integration for core functionality.

The fork distinguishes itself from [[cal_com|Cal.com]]'s production system through maintained open-source accessibility rather than architectural divergence, preserving compatibility with the established codebase while enabling independent development and customization (([[https://alphasignalai.substack.com/p/calcom-closed-its-source-code-heres|AlphaSignal - Open Source Scheduling Platform Alternatives (2026]]))

===== Use Cases and Applications =====
Cal.diy serves multiple deployment scenarios within the self-hosting and developer community. Small businesses, freelancers, and consultants can deploy the platform to manage client scheduling without external service dependencies. Development teams and technical organizations utilize the fork to integrate scheduling capabilities into custom applications or internal workflows. Educational institutions and non-profit organizations benefit from zero-cost deployment and complete customization capability without licensing restrictions.

The platform supports integration with calendar systems, notification services, and booking workflows typical of scheduling applications. Self-hosted deployment enables organizations to maintain scheduling data within their own infrastructure, addressing privacy and data residency requirements (([[https://alphasignalai.substack.com/p/calcom-closed-its-source-code-heres|AlphaSignal - Self-Hosted Scheduling Solutions (2026]]))

===== Community and Development Status =====
Cal.diy operates as a community-maintained project within the broader ecosystem of open-source scheduling platforms. The fork benefits from contributions from developers who prefer open-source alternatives to proprietary scheduling services. The project's MIT license facilitates community engagement and derivative implementations while maintaining the original codebase's accessibility for non-commercial and commercial use cases.

The distinction between Cal.diy and [[cal_com|Cal.com]]'s commercial product reflects broader industry trends toward forking and community maintenance of open-source projects when primary maintainers transition to proprietary models. This pattern provides technical communities with sustainable alternatives for critical infrastructure components (([[https://alphasignalai.substack.com/p/calcom-closed-its-source-code-heres|AlphaSignal - Open Source Scheduling Platform Forks (2026]]))

===== Comparison with Cal.com =====
Cal.com's production system and Cal.diy represent divergent approaches to scheduling platform availability. Cal.com's managed service incorporates rewritten authentication infrastructure and integrated billing systems designed for commercial use and subscription management. Cal.diy maintains the earlier open-source codebase with MIT licensing, prioritizing accessibility and self-hosting capability over commercially integrated features.

Organizations selecting between the platforms consider factors including deployment control, licensing costs, customization requirements, and infrastructure maintenance responsibilities. Cal.diy appeals to users prioritizing open-source principles and self-hosted infrastructure, while Cal.com's commercial offering provides managed service convenience and proprietary feature development.

===== See Also =====

  * [[cal_com|Cal.com]]
  * [[calendar_app|Calendar (macOS Native App)]]
  * [[autonomous_scheduling_agent|What Is an Autonomous Scheduling Agent]]

===== References =====