Last updated: 11/8/2026Last verified: 2026-11-07
<p>Hallmark is a free open-source design skill for Claude Code, Codex, Cursor, and OpenCode that fights AI slop: it deals one of fifty curated themes, builds pages around the action visitors came for, and lints its own output in a real browser before anything ships.</p><ul><li>Fifty theme catalogs (paper, type, color, surfaces) that each page is laid out in</li><li>Pages built around the job: booking pages book, shops sell, newsletters subscribe</li><li>Browser-rendered slop lint plus a fresh-context reviewer that audits contrast, focus, reduced motion, and invented facts</li><li>Redesign and audit modes that keep existing content and wiring, with before/after side-by-side handoff</li></ul>
Details
Platform
macOSWindowsLinux
Features
- Fifty theme catalogs (paper, type, color, surfaces) that each page is laid out in
- Pages built around the job: booking pages book, shops sell, newsletters subscribe
- Browser-rendered slop lint plus a fresh-context reviewer that audits contrast, focus, reduced motion, and invented facts
- Redesign and audit modes that keep existing content and wiring, with before/after side-by-side handoff
Languages
en
Best for
Devs who want generated pages to avoid AI-generated design tellsTeams standardizing on a linter-enforced design floor for agent-built pagesFrontend teams auditing existing pages against machine-made design patterns
Known limitations
- Requires Node 18+; full browser-render checks additionally need puppeteer-core and a local Chrome install
- Invoked as a slash command or skill, not a standalone web app; results depend on the host coding agent
- Theme catalog and photo library are curated by the project rather than a full custom design system
Alternatives
Agent Skills — Broader SDLC skill coverage rather than a design-specific floor
LangChain Content Studio — Chat/Slack-driven design agent producing brand assets in a sandbox
Kami — Inspiring design-taste skill with a different theme catalog
