Crystal Code is a free and open-source (MIT licensed) AI coding assistant designed for the terminal. Built for developers by developers, it is a non-commercial, community-driven project with no subscriptions, vendor lock-in, or proprietary cloud backend.
Operating directly within your command-line interface, Crystal Code interacts with your local codebase through an interactive streaming UI. It empowers developers to understand large projects, plan architectural changes, and execute automated edits safely and transparently.
Key Features:
• 100% Free & Open Source: Released under the permissive MIT license. The entire codebase is transparent and open on GitHub.
• Terminal-First Workflow: Stay in your preferred terminal environment with real-time streaming output, interactive session forks, and prompt queuing.
• Plan & Work Modes: Switch between a safe, read-only "Plan mode" for exploring architecture and a "Work mode" for file modifications and shell tasks, protected by a risk-aware permission system.
• Model Agnostic & BYOK: Bring your own API keys or run fully local and offline. Native support for DeepSeek, OpenAI, Anthropic Claude, Google Gemini, and local models via Ollama.
• Highly Extensible: Built on modern .NET, allowing C# developers to easily customize plugins, skills, prompts, and tool contracts directly in code.
• Privacy & Local-First: Your code and session history remain on your machine, storing data locally with full user control.
• Cross-Platform: Runs seamlessly across Linux , macOS, and Windows.
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