Dark
Darklang builds an open source functional language and toolchain for backend development.
Founded
2017Darklang builds an open source functional language and toolchain for backend development.
Darklang combines language, package management, and deployment in one toolchain, so developers write code once and run it locally or in the cloud. A single binary install, streamed packages without separate install steps, and instant cloud deployment reduce setup and operations work.
The language uses records, enums, option types, and result types with garbage collection and Unicode-first strings, aiming for readable programs. Immutability by default also makes generated code easier to read, replay, and run safely.
Source: darklang.com
Developer tooling demand has shifted toward AI-assisted coding, with code generation happening inside editors such as Cursor, Windsurf, and VS Code with Copilot. Darklang positions its immutable, package-managed language as a safer runtime for running and sharing generated code.
The team sees paid opportunity in team collaboration features and AI-powered tooling while keeping the core platform open and self-hostable. That direction follows the 2025 transition from Dark Inc to employee-led Darklang Inc.
Source: blog.darklang.com
Darklang is the current open source functional language and toolchain for building CLIs and cloud applications. It offers a command-line interface, a package manager with individually versioned functions and types, editor integrations, and deployment with managed databases, endpoints, and worker queues.
Darklang Classic is the legacy hosted platform in maintenance mode, with no new signups since July 2025. Existing Classic programs keep running while new users are directed to the rebuilt Darklang.
Source: darklang.com