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What it does

Power Design is a Claude Code skill that makes two kinds of output — presentation decks and full responsive websites — combining two things every other AI generator misses:

1. Brand DNA — extracted live from any URL via Firecrawl, or picked from 72+ pre-built brand systems (Stripe, Apple, Linear, Spotify, Vercel, Notion, Tesla, Airbnb…)
2. Codified design principles — research-backed rules with numeric thresholds. 20 for slides (Tufte, Reynolds, Duarte, Williams, Refactoring UI, Müller-Brockmann, Mayer, WCAG 2.2) and 20 for the web (Marcotte, Krug, Bringhurst, Utopia, Baymard, NN/g, Core Web Vitals, WCAG 2.2).

The result: every output is both on-brand and objectively well-designed. Decks with no purple gradients, no six-bullet heroes, no drop-shadowed bars. Websites that are mobile-first, fast (Core Web Vitals-budgeted), accessible (WCAG 2.2 AA), and built to convert.

One skill, two paths. It asks "deck or website?" first, then routes to the right rulebook off the same brand engine.

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The 20 slide rules, illustrated

Every slide passes the same 20 checks. Read the full field manual →

#	Rule	Source
1	One idea per slide	Reynolds; Duarte
2	Glanceable in ≤3 seconds	Duarte; NN/g
3	≤7±2 visual chunks; ideal 3–5	Miller 1956; Cowan 2001
4	≥40% whitespace ratio	Refactoring UI; Reynolds
5	5% edge safe-zone, all sides	Broadcast title-safe
6	Type on a modular scale (1.25–1.618)	Tschichold; Bringhurst
7	Maximum 4 type sizes per slide	Refactoring UI
8	Body ≥24px, title ≥48px	Reynolds; Duarte
9	Line-height 1.4–1.6 body, 1.05–1.2 display	Butterick; Bringhurst
10	Line length ≤60 characters	Bringhurst
11	WCAG contrast ≥4.5:1 body, aim 7:1 (AAA)	WCAG 2.2
12	60-30-10 color split	Itten; Refactoring UI
13	One accent per slide	Tufte
14	Never encode meaning by hue alone	WCAG 1.4.1
15	8pt grid for all spacing	Bryn Jackson; Material
16	Align everything to one grid	Müller-Brockmann
17	Proximity: related ≤16px, unrelated ≥48px	Gestalt; Williams
18	Data-ink ratio ≥80%	Tufte 1983
19	F-pattern: headline + key visual top-left	NN/g eye-tracking
20	Two valid modes — pick one and stay	Tufte vs Reynolds

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The 20 web rules

A slide is a fixed frame. A page is a fluid, interactive, indexable system — so websites pass a second rulebook, built for the four questions a slide never has to answer: does it hold up from 360px to 1440px, is it fast, can everyone use it, does it convert? Read the full ruleset →

#	Rule	Source
1	Mobile-first, fluid to a capped measure	Marcotte; Frost
2	Breakpoints follow content, not devices	Frost; Tailwind
3	Fluid type & space via clamp()	Utopia — Mudford & Gilyead
4	Body ≥16px; tap targets ≥44×44px	Apple HIG; WCAG 2.5.8
5	One primary action per view	Krug; Hick's Law
6	The fold answers what/who/next in 5s	NN/g; Krug
7	F-scan text, Z-scan heroes; left-align body	NN/g; Butterick
8	Measure 45–75 characters	Bringhurst; Butterick
9	Line-height ≥1.5 body; rhythm on 8	WCAG 1.4.12; Bringhurst
10	8pt spacing, one modular type scale	Material; Bryn Jackson
11	WCAG 2.2 AA is the floor (UI/focus ≥3:1)	WCAG 2.2
12	Semantic OKLCH color tokens, not raw hex	W3C DTCG; Ottosson
13	Five states per interactive element	WCAG 2.4.11/13; Radix
14	Design empty, loading & error states	NN/g; Refactoring UI
15	Motion fast, purposeful, opt-out	Material; WCAG 2.3.3
16	Reserve space — protect CLS < 0.1	web.dev Core Web Vitals
17	Ship a performance budget (LCP/INP/CLS)	web.dev; Google 2024
18	Landmarked, keyboard-complete, one <h1>	WCAG 1.3.1 / 2.4.1
19	Forms: labels, inline validation, min fields	Baymard; NN/g
20	Ship the meta layer (title / OG / JSON-LD)	Open Graph; schema.org

For the build stack behind modern web output — design tokens, shadcn/ui, Tailwind v4, Radix, OKLCH, motion, theming — see the sister repo power-design-web.

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Install

git clone https://github.com/ItsssssJack/power-design ~/.claude/skills/power-design

Then in Claude Code:

> use power-design — make me a deck for stripe.com about our new product launch
> use power-design — build me a landing page in linear.com's style for my new app

The skill will:

1. Ask deck or website?, then which brand (paste URL, pick from library, or skip for default)
2. Extract brand DNA via Firecrawl (~30 seconds)
3. Ask a short brief (deck: headline + 3–5 points · site: type, goal, sections)
4. Generate slides.html or a responsive site.html, applying brand DNA × the right 20 rules
5. Open in browser. Refine via natural conversation.

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Brand library — 72 pre-built systems

Tech / AI	Finance	Auto / Lifestyle	Media	Productivity
Anthropic / Claude · OpenAI · DeepSeek · Linear · Vercel · Stripe · Cursor · GitHub · Figma · Webflow · Framer · Mintlify · Notion · Raycast · Lovable · Resend · Sentry · Supabase · Superhuman · MongoDB · Sanity · Posthog · Replicate · Runway · Hashicorp · ElevenLabs · Cal · Clay · Composio · ClickHouse · Cohere · Mistral · Together · x.ai · Ollama · OpenCode · Expo · Pinterest · Glaido	Stripe · Mastercard · Coinbase · Binance · Kraken · Revolut · Wise · Shopify	Tesla · BMW · BMW M · Bugatti · Ferrari · Lamborghini · Renault · Nike · Airbnb · Apple · Starbucks · Grind · Vodafone	The Verge · Wired · Spotify · YouTube · Sony · PlayStation · IBM	Notion · Slack · Miro · Intercom · Zapier · Uber · NVIDIA · SpaceX · VoltAgent · Warp

Each entry is a single brand-style.md file: colors, type, voice, components, source URL. Add your own using brands/_template.md.

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How the skill works (under the hood)

   ┌────────────────────────────────────────────────┐
   │  0. Deck or website?    → routes the rulebook  │
   ├────────────────────────────────────────────────┤
   │  1. Brand DNA           (URL → Firecrawl)      │
   │     OR pick from        brands/<name>.md        │
   ├────────────────────────────────────────────────┤
   │  2. Design rules        design-principles.md   │
   │                         OR web-principles.md   │
   ├────────────────────────────────────────────────┤
   │  3. Compose             brand × rules → HTML    │
   └────────────────────────────────────────────────┘
                       ↓
              slides.html  ·  site.html

The skill's runbook lives in SKILL.md. The design principles — with research citations and numeric thresholds — live in principles/design-principles.md (slides) and principles/web-principles.md (web).

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Credits

• Brand library — forked and restructured from VoltAgent/awesome-design-md, with permission and credit.
• Design research (slides) — Edward Tufte, Garr Reynolds, Nancy Duarte, Robin Williams (CRAP), Adam Wathan & Steve Schoger (Refactoring UI), Josef Müller-Brockmann, Matthew Butterick, Robert Bringhurst, Richard Mayer, Nielsen Norman Group, WCAG 2.2.
• Design research (web) — Ethan Marcotte, Luke Wroblewski, Brad Frost, Steve Krug, Utopia (Trys Mudford & James Gilyead), Björn Ottosson (OKLCH), Baymard Institute, Nielsen Norman Group, Google Core Web Vitals, W3C WCAG 2.2 & Design Tokens CG.
• Illustrations — generated via Kie.ai nano-banana 2.

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License

MIT — see LICENSE.

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