Two design skills · both proven

canvas-design vs web-design-guidelines

Both skills were run through Claude twice: once on a fixed brief without the skill, once with it. The briefs differ because each is written for the job the skill claims to do, so compare each skill against its own baseline, then decide which difference matters for your work.

canvas-design

Create beautiful visual art in .png and .pdf documents using design philosophy. You should use this skill when the user asks to create a poster, piece of art, design, or other static piece. Create original visual designs, never copying existing artists' work to avoid copyright violations.

Category: Design
Source: anthropics/skills · 181,998 stars
License: Not stated
Proof model: claude-sonnet-5-5
Brief: “Build a poster-style hero page for a jazz night at a small club, with the lineup and ticket link.”
Skill commit: dbd4588

web-design-guidelines

Review UI code for Web Interface Guidelines compliance. Use when asked to "review my UI", "check accessibility", "audit design", "review UX", or "check my site against best practices".

Category: Design
Source: vercel-labs/agent-skills · 32,607 stars
License: Not stated
Proof model: claude-sonnet-5-5
Brief: “Build a sign-up form for a newsletter with name, email, a topics checklist, and clear error and success states.”
Skill commit: 063bee9

We don’t pick a winner for you: the pages are the evidence. Both proofs can be repeated with the brief, model and commit shown above. See alternatives to canvas-design or alternatives to web-design-guidelines.