fx (by Vercel) — Vercel's tiny, open-source coding agent Open-source coding agent developed and maintained by Vercel.
About fx (by Vercel)
fx is an AI coding agent built and maintained by Vercel that runs as a small, open-source tool for software development work.
Its standout trait is being distributed as open-source software under Vercel's stewardship, paired with a deliberately tiny footprint meant to keep resource demands low compared to heavier agent frameworks.
It fits developers who prefer open-source tooling they can adapt themselves, and anyone who wants a coding agent without the bloat of heavier alternatives.
Within the AI coding agents category, fx competes on openness and minimalism rather than on a wide range of features or integrations.
Sources: the tool's official site, this listing
fx (by Vercel) pros and cons
Pros
- Open-source coding agent developed and maintained by Vercel.
- Designed as a lightweight 'tiny' agent with minimal footprint.
Tagged
- Web-based
- Agentic Mode
- Free
- Open Source
fx (by Vercel) alternatives
More from AI Coding Agents.
- 01→pumaDB
a small hosted memory layer for AI agents
- 02→Mellum by JetBrains
Fast LLMs for low-latency and high-performance workflows
- 03→Firecrawl Research Index
An index for agents pushing the frontier of AI/ML research
- 04→Claude Code Artifacts
Preview and share your coding work live as it happens
- 05→GitHits beta 0.9
Give your AI coding agent access to open-source code
- 06→Daemons by Charlie Labs
Keep PRs, issues, CI, and docs moving with AI agents
Related reading
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</a>Frequently asked questions
- What is fx (by Vercel)?
- fx (by Vercel) — Vercel's tiny, open-source coding agent
- What are the alternatives to fx (by Vercel)?
- Similar tools in AI Coding Agents on vibedonalds: pumaDB, Mellum by JetBrains, Firecrawl Research Index, Claude Code Artifacts.