Pi

Pi is a terminal-based development environment that empowers developers to build custom AI workflows directly from the command line. Unlike graphical IDEs that limit your technical control, Pi gives you complete freedom to integrate language models and orchestrate complex engineering tasks without restrictive autocompletions getting in your way.

Take full control of your AI agent configuration. Pi lets you build intelligent workflows at your own pace by integrating AI packages, agents, and TUI components exactly as you need them. Define precise instructions through customizable SYSTEM.md and AGENTS.md files tailored to each project, gaining context management that rivals or exceeds competing solutions. You're not locked into pre-built patterns—you architect the entire system from the ground up.

Navigate conversations like a codebase, not a linear chat. Pi uses a tree data structure that lets you branch conversations, test alternative solutions, and merge the best results without losing original context. If you want to explore a different approach, simply create a new branch. No need to restart, no lost information. This fundamental difference in conversation design makes iteration faster and more intuitive for engineers.

Switch between multiple language models seamlessly. Work with OpenAI, Anthropic, or run local models directly—Pi adapts to your preferred LLM stack. Write custom extensions in TypeScript to extend the agent's capabilities exactly as your project demands. You maintain complete ownership of your AI integration layer.

While Pi requires more upfront configuration than some alternatives, this is precisely where its power lies. You're not constrained by vendor defaults or one-size-fits-all settings. Streamline your setup by installing community packages, or keep everything minimal and customized to your specific workflow. The choice is entirely yours.

Pi is open-source and free to download for Windows. Install it directly or deploy via npm with a single command. Whether you're automating complex refactoring tasks, building intelligent agents for engineering work, or experimenting with multi-model orchestration, Pi removes the dependency on third-party AI assistants and puts control back in your hands. Experience terminal-native AI development the way it's meant to be.