fx (by Vercel) vs Ralph TUI

Feature	fx (by Vercel)	Ralph TUI

Tagline	Tiny, open, embeddable, native coding agent by Vercel.	AI agent loop orchestrator for terminal
Website	https://fx.sh	https://ralph-tui.com
Language	zig	typescript
Release Date	August 17, 2026	January 14, 2026
Last Updated	August 19, 2026	August 19, 2026
Provider Type	Independent	Independent
MCP Support	Yes	Yes
Multi-Agent Support	No	Yes
Git Integration	basic	deep integration with git worktrees
Multi-File Editing	Yes	Yes
Auto Test Running	No	No
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	Yes
Voice Mode	No	No
IDE Integration	None - Terminal only	None - Terminal only
Hooks / Extensions	No	No
Web Search	Yes	Yes
Local Model Support	Yes	Yes
Context Window	Model-dependent	Depends on underlying agent
Supported Models	All Vercel AI Gateway supported models, including OpenAI, Anthropic, Google, DeepSeek, z.AI, Moonshot, etc	Orchestrates Coding Agents: Claude Code, OpenCode, Gemini CLI, Codex, Kiro, Droid, Cursor CLI.
Pricing Model	Free, BYOK, Usage Based	BYOK
Free Tier	No	Yes
Price Range	0 - $20 / mo / Custom (Vercel AI Gateway)	Free (BYOK)
Source Code Availability	Open Source (Apache-2.0)	Open Source (MIT)
Source Code	https://github.com/vercel-labs/fx	https://github.com/subsy/ralph-tui
Development State	active	active