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

--- > **If PixelCheck helps you, [give it a star](https://github.com/xcodethink/pixelcheck/stargazers) — it helps others discover the project.** --- ## 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`.

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