Hallmark is a design skill for Claude Code, Codex, Cursor and OpenCode that aims to stop AI-built web pages from looking machine-made.
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It picks themes from a catalog of 48, builds each page around what the visitor came to do, and lints the result in a real browser against common AI-design tells before a fresh-context reviewer has the final say.
- 01
48 material-style themes, plus a custom mode that designs from the prompt alone
- 02
sloplint browser checks at eight widths against tiered Floor, Reflex and Finish gates
- 03
Fresh-context subagent review of every build
- 04
/hallmark redesign and /hallmark audit commands for existing pages
- 05
Installs via npx skills add or as a Claude Code plugin, with an optional edit-time hook
Open Source
Free and open source; installed as an agent skill with no account or paid tier, running on your existing coding agent's model access.
Best for
Developers using AI coding agents to build landing pages and marketing sites who want distinctive, accessible output instead of generic AI-generated layouts.
Not ideal for
Teams that already enforce a strict in-house design system, or projects that need application UI and component libraries rather than self-contained pages.
A popular, opinionated design guardrail for coding agents that pairs taste with automated browser checks, making it a strong complement to agent-driven frontend work.
Version 2 added 48 themes, job-driven page layouts, custom mode, automatic screenshots of real products, a library of openly licensed photos, and redesign/audit commands.
As of
Is Hallmark free?+
Yes - Hallmark is Open Source. Free and open source; installed as an agent skill with no account or paid tier, running on your existing coding agent's model access.
Is Hallmark open source?+
Yes - Hallmark is open source. Free and open source; installed as an agent skill with no account or paid tier, running on your existing coding agent's model access.
Who is Hallmark best for?+
Developers using AI coding agents to build landing pages and marketing sites who want distinctive, accessible output instead of generic AI-generated layouts.
Who is Hallmark not ideal for?+
Teams that already enforce a strict in-house design system, or projects that need application UI and component libraries rather than self-contained pages.
What are the best Hallmark alternatives?+
The closest Hallmark alternatives on ai.dosa.dev are Pieces for Developers, agenttrace, Vibe Kanban - all listed under Developer Productivity & Workflow.
Who makes Hallmark?+
Hallmark is developed by Together AI. It is listed in the Developer Productivity & Workflow category on ai.dosa.dev.
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