Improving Codex's UI Design Output with Impeccable (npx impeccable install)

Melvin Vivas · X video post · 2026-09-14 · 0:13 · 8,266 views · Open on X

Topics: AI Dev Tools & Productivity · Level: beginner

Summary

This is a short demo post. Melvin Vivas installs Impeccable with one command, npx impeccable install, and shows that OpenAI's Codex coding agent then produces better-looking UI designs. He adds Impeccable on top of his existing coding agent. He also jokes that this might replace Claude Design. The 13-second video has no narration, so the main takeaway is the tool and how to install it.

Key points

• Impeccable (@impeccable_ai) is an add-on that improves the visual and UI design work of an AI coding agent like Codex.
• You install it with one command: npx impeccable install. This needs Node.js / npm.
• After installing it, the creator found Codex's design output much better ('Codex is now a better designer!').
• Other users recommended the tool to him, so it seems to be gaining popularity among people who use AI coding agents.
• He jokes about cancelling Claude Design, which suggests a free add-on for your coding agent could compete with dedicated AI design products.
• The video has no speech. It is a quick visual demo, not a walkthrough.

Resources mentioned

• Impeccable (@impeccable_ai) · tool · x.com · free
  A design add-on for AI coding agents, installed with `npx impeccable install`, that improves the quality of the UI/frontend designs they generate.
  Also in: Impeccable: a design skill that helps Codex and AI agents produce better UI (Melvin Vivas on X · notes)
• OpenAI Codex · tool · openai.com · paid
  OpenAI's coding agent. In the diagram it writes code, fixes review findings and drives the build loop. The creator also used it to make this video.
  Also in: An agent bot that installs and drives Codex on its own (Melvin Vivas on X · notes), Asking a Coder bot to install Codex (Melvin Vivas on X · notes), Sign in with ChatGPT: Setting Usage Limits for Each App (Melvin Vivas on X · notes), Codex Cloud Environments Must Be Saved & Published Before Use (Melvin Vivas on X · notes) and 240 more
• Claude Design · tool · anthropic.com · paid
  Anthropic Labs tool that creates prototypes, slides and one-pagers when you describe them to Claude in chat.
  Also in: Codex Subagents: Attaching Skills and MCP Servers per Subagent (Melvin Vivas on X · notes), AutoDesign: Improving the Harness Around the Model with a Meta-Harness Loop (Melvin Vivas on X · notes), Claude Code's /design Skill: Pick UI Artboards, Then Have Claude Build One (Melvin Vivas on X · notes), Claude Design Is Now in the Claude Desktop App (Melvin Vivas on X · notes) and 4 more

Try this

• Run `npx impeccable install` in a project where you use Codex or another AI coding agent.
• Compare the agent's UI output before and after installing Impeccable.