PixelCheck

Real eyes and hands for the AI agent that's writing your frontend.

Drop-in MCP server. Five browser primitives. Eighteen personas across fifteen countries.
Local-first · Vendor-agnostic · MIT-licensed · Yours to own.

Quick Start →  ·  Primitives  ·  MCP Server  ·  Audit Preset  ·  Why Not E2E  ·  Changelog

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If PixelCheck helps you, give it a star — it helps others discover the project.

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Right now, you're a screenshotting middleman.

Your AI agent is writing 80% of your frontend. It's fast. It's good at code. But it's blind.

• It writes a button. You open Chrome to check it rendered right. Paste a screenshot back. Ask for the fix.
• It tweaks the OAuth flow. You log in to verify it didn't silently break. Again. Sixth time this month.
• It updates the Japanese strings. A user emails: "half the page is in English." You didn't catch it.
• It rewrites checkout. You walk through it on iPhone, Android, iPad just to feel whether step 3 is confusing.
• It changes the Arabic layout. RTL didn't propagate. You don't notice for two days.

You become the bridge. The agent has thoughts. You have a browser. The two never meet. Hours of your week, every week, indefinitely.

PixelCheck is the bridge.

A single MCP server. Five primitives. Drop it in once — your agent has eyes and hands.

see(url, opts)              snapshot a page (DOM + screenshot + console + network)
act(url, steps)             execute an action sequence (semantic + selector + Computer Use)
extract(url, schema)        pull structured data matching a Zod / JSON schema
judge(url, rubric)          score a page against a rubric ("is this dark-pattern free?")
compare(a, b, criteria)     A/B comparison of two URLs (incl. blind mode)

Now your agent navigates. Sees rendered HTML. Reads console errors. Clicks. Fills. Judges. Compares. Without ever leaving its workflow — drop into Claude Desktop, Cursor, Cline, Continue, Zed, or Claude Code via four lines in ~/.mcp.json.