What is fx?
fx is a small coding agent harness and command-line tool built in Zig, designed for research use and embedding into larger systems. It can be installed locally or tried in the browser through a WebAssembly demo. The project is open and currently experimental with frequent changes.
Key facts
- Pricing
- Open source
- Category
- Coding
- Website
- https://fx.sh/
- Listing updated
- Nov 12, 2026
fx FAQ
What is fx?
fx is a small coding agent harness and command-line tool built in Zig, designed for research use and embedding into larger systems. It can be installed locally or tried in the browser through a WebAssembly demo. The project is open and currently experimental with frequent changes.
What does fx cost?
fx pricing is listed as Open source.
What are alternatives to fx?
Coding alternatives to fx include GitHub Copilot, Together AI, Baseten, Straion, Cursor and Pinecone.