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	April 28, 2026
Provider Type	Independent	Independent
MCP Support	Yes	Yes
Multi-Agent Support	No	Yes
Git Integration	minimal	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
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