Rubric

What it does

Coding agents ship UI fast, but they design from vibes. Rubric gives them a source: 554 curated UX rules with severity, evidence and a concrete fix, served over MCP. One corpus, two moments. Before you build, your agent pulls prescriptive guidance, not generic best practices. After you ship, it audits the live site against the same rules and returns findings ranked by severity: issue, impact, actions, references. Claude Code, Cursor, Windsurf, Cline. Browser approval, no API keys.

Audit, test and measure every website. Rubric applies hundreds of UX checks to live pages, predicts attention, simulates visitors and measures real ones, and serves the same checks to coding agents over MCP.

Rubric applies hundreds of UX checks to your pages and tells you what to fix first. It predicts where attention lands, sends simulated visitors through the page, and measures the real ones. Built for agencies and freelancers who look after websites. Observed — Homepage uses technical jargon without explanation: 'MCP' (Model Context Protocol), 'corpus', 'audit', 'checklist' are not defined for unfamiliar visitors. Example: 'serves a curated UX corpus to coding agents over MCP' assumes knowledge. Issue — The page lacks a low-commitment secondary path — only a single primary action with no fallback for visitors who aren't ready to commit yet. A real audit, a predicted heatmap, a simulated…from rubric.design

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