Preview the prompt +
# Build brief — an original marketing website in the taste of LaunchDarkly
> Reference: https://launchdarkly.com · UIDiscovery: https://uidiscovery.com/sites/launchdarkly · captured 2026-09-21 at a 1440px desktop viewport (+ 390px iPhone shots) · [full page](https://uidiscovery.com/media/captures/launchdarkly/full.webp) · [scroll video](https://uidiscovery.com/media/captures/launchdarkly/preview.mp4)
## 1. Goal
Build an original marketing website for **[the user's brand]** that feels as considered as LaunchDarkly — same structure, rhythm and polish, entirely new identity and content.
## 2. Originality rules
- Build an ORIGINAL design for the user's own brand in the same *taste* as LaunchDarkly: structure, rhythm, hierarchy, palette mood and type pairing.
- Never reuse LaunchDarkly's logo, name, product imagery, illustrations, icons, screenshots or copy. Write new copy for the user's product.
- If the user hasn't said what their product is, ask first (or use clearly marked placeholders like [Brand], [Product], [Audience]).
- Reference screenshots are for looking at, not for embedding or tracing.
## 3. The taste, in short
- LaunchDarkly (launchdarkly.com): Developer Tools marketing website, dark, colorful.
- 7 sections: Features → Footer.
- Spacing: about a screen per idea (median section ≈872px).
- Type: Heading Font3 headings over Body Font body. Imagery: mostly product UI screenshots/mockups, some photography.
## 4. Page structure (top to bottom)
### 1. Features — explain the key benefits, grouped so each can be scanned in seconds.
- Layout: section title over a grid or alternating rows of benefit items. Tall, ≈1.9 screens (1700px at 1440), page background; 15 images/icons (a set of cards or a small gallery); 10 buttons (tabs, toggles or per-card actions); 6 headings → ~5 items under a title.
- Slots: Section title (~5 words, like the reference); 5 items: icon or visual + short title + 1–2 line description; Primary + secondary action.
- Topic (tone/length only — never reuse): “Control every change in production.”
- [Screenshot](https://uidiscovery.com/media/captures/launchdarkly/s-01.webp) · imagery: slot 1
### 2. Features — explain the key benefits, grouped so each can be scanned in seconds.
- Layout: section title over a grid or alternating rows of benefit items. About one full screen (830px at 1440), page background; 2 image/graphics; no interactive controls.
- Slots: Section title (~10 words, like the reference); 2 items: icon or visual + short title + 1–2 line description.
- Topic (tone/length only — never reuse): “Ship with AI that does what you expect—however you build.”
- [Screenshot](https://uidiscovery.com/media/captures/launchdarkly/s-02.webp) · imagery: slot 1
### 3. Features — explain the key benefits, grouped so each can be scanned in seconds.
- Layout: section title over a grid or alternating rows of benefit items. About one full screen (872px at 1440), page background; 2 image/graphics; one primary button.
- Slots: Section title (~5 words, like the reference); 2 items: icon or visual + short title + 1–2 line description; One primary action.
- Topic (tone/length only — never reuse): “Control your code in production.”
- [Screenshot](https://uidiscovery.com/media/captures/launchdarkly/s-03.webp) · imagery: slot 1
### 4. Features — explain the key benefits, grouped so each can be scanned in seconds.
- Layout: section title over a grid or alternating rows of benefit items. About one full screen (872px at 1440), page background; 2 image/graphics; one primary button.
- Slots: Section title (~5 words, like the reference); 2 items: icon or visual + short title + 1–2 line description; One primary action.
- Topic (tone/length only — never reuse): “Control your agents in production.”
- [Screenshot](https://uidiscovery.com/media/captures/launchdarkly/s-04.webp) · imagery: slot 1
### 5. Features — explain the key benefits, grouped so each can be scanned in seconds.
- Layout: section title over a grid or alternating rows of benefit items. Half to one screen (604px at 1440), page background; 3 image/graphics; one primary button.
- Slots: Section title (~4 words, like the reference); 3 items: icon or visual + short title + 1–2 line description; One primary action.
- Topic (tone/length only — never reuse): “See how LaunchDarkly works.”
- [Screenshot](https://uidiscovery.com/media/captures/launchdarkly/s-05.webp) · imagery: slot 2
### 6. Features — explain the key benefits, grouped so each can be scanned in seconds.
- Layout: section title over a grid or alternating rows of benefit items. About one full screen (830px at 1440), page background; 39 image elements (icons, logos, product UI — not 39 photos); 24 buttons (tabs, toggles or per-card actions).
- Slots: Section title (~10 words, like the reference); 3 items: icon or visual + short title + 1–2 line description; Primary + secondary action.
- Topic (tone/length only — never reuse): “Savage X Fenty keeps shoppers engaged with rapid, reliable experiments.”
- [Screenshot](https://uidiscovery.com/media/captures/launchdarkly/s-06.webp) · imagery: slot 3
### 7. Footer — navigation, legal and contact — the page's index.
- Layout: multi-column link groups, brand line, legal row. Tall, ≈1.6 screens (1440px at 1440), page background; 18 image elements (icons, logos, product UI — not 18 photos); 32 links (link lists / navigation).
- Slots: Brand mark + one-line description; 3–5 link columns; Newsletter or contact (optional); Legal row + social icons.
- [Screenshot](https://uidiscovery.com/media/captures/launchdarkly/s-07.webp)
Inner pages also captured (Pricing, Product, Customers, About, Blog, Docs, Enterprise, Careers, Contact, Security): https://uidiscovery.com/sites/launchdarkly?view=pages
## 5. Design system
### Colour
| Role | Hex | Use | Contrast on background |
|---|---|---|---|
| background | `#191919` | page background | — |
| foreground | `#ffffff` | body text, headings | 17.6:1 |
| accent | `#ff9d29` | primary buttons, links, highlights — sparingly | 8.5:1 |
| surface | `#191919` | cards, inputs, alternate bands | text on it 17.6:1 |
| muted | `#d1d6d9` | secondary text, borders | 12.0:1 |
Captured palette: `#191919` `#f8f8f8` `#ddff46` `#d1d6d9` `#ff9d29` `#ffffff`. Roles are assigned automatically — sanity-check them against the screenshot. Keep the palette's *mood* (dark, warm) and proportions; swap the accent for the user's brand colour.
### Tokens
```css
:root {
--background: #191919;
--foreground: #ffffff;
--accent: #ff9d29;
--surface: #191919;
--muted: #d1d6d9;
--font-heading: "Barlow", ui-sans-serif, system-ui, sans-serif;
--font-body: "Inter", ui-sans-serif, system-ui, sans-serif;
--radius: 12px; /* calibrate from the screenshot */
}
/* Tailwind v4 — in globals.css after @import "tailwindcss"; */
@theme {
--color-background: var(--background);
--color-foreground: var(--foreground);
--color-accent: var(--accent);
--color-surface: var(--surface);
--color-muted: var(--muted);
--font-heading: var(--font-heading);
--font-sans: var(--font-body);
}
```
### Typography
- Headings: **Barlow** (Google Fonts) — reference uses Heading Font3. “Heading Font3” is a licensed face — use Barlow (or Space Grotesk) as the free stand-in, or license the original.
- Body: **Inter** (Google Fonts) — reference uses Body Font. “Body Font” is likely a custom or licensed face. Inter is a neutral stand-in — pick a closer free match by eye from the screenshot.
- Scale (starting point, sizes weren't measured — calibrate against the 1440px screenshot): display clamp(2.5rem, 5vw, 4.25rem), h2 clamp(1.75rem, 3vw, 2.5rem), h3 1.25rem, body 1rem–1.125rem / 1.6, small 0.875rem. Headings: tight tracking (-0.02em), line-height 1.05–1.15.
### Spacing & rhythm
Sections run ≈872px tall at 1440 (median; range 604–1700px, captures cap at 1700px) — roughly a screen per idea. Start with 96–120px vertical padding per section on desktop and about two-thirds of that on mobile. One continuous background — separate sections with space and type, not colour bands. 8px spacing grid, 1200–1280px max content width, 24px (mobile) / 32–48px (desktop) gutters.
### Shape, depth & theme
On dark, separate layers with 1px borders at ~8–12% white and soft glows instead of drop shadows; confident colour blocks — let full-bleed colour bands and big shapes carry the personality. Read exact corner radius, border and shadow treatment from the screenshots. Dark-first; for a light mode swap background ↔ foreground, lighten the surface, keep the accent and re-check contrast.
## 6. Imagery plan
Best guess: mostly **product UI screenshots/mockups**, some photography (dark, warm, Developer Tools). Inferred from element counts, colours and industry — not from the pixels — so open the linked screenshots and match the real style before sourcing anything.
### Slot 1 · 1. Features, 2. Features, 3. Features, 4. Features → product UI (uncertain)
- Developer Tools sections with many image elements — most likely product UI screenshots/mockups plus icons. Count: one consistent treatment across these sections. Aspect: 4:3. Look first: [ref 1](https://uidiscovery.com/media/captures/launchdarkly/s-01.webp) [ref 2](https://uidiscovery.com/media/captures/launchdarkly/s-02.webp) [ref 3](https://uidiscovery.com/media/captures/launchdarkly/s-03.webp) [ref 4](https://uidiscovery.com/media/captures/launchdarkly/s-04.webp)
- **Stock** — “laptop blank screen minimal desk”: [Unsplash](https://unsplash.com/s/photos/laptop-blank-screen-minimal-desk?orientation=landscape) · [Pexels](https://www.pexels.com/search/laptop%20blank%20screen%20minimal%20desk/?orientation=landscape) · [Pixabay](https://pixabay.com/images/search/laptop%20blank%20screen%20minimal%20desk/?orientation=horizontal)
- **Generate** — `Product-shot backdrop for a UI screenshot: smooth dark gradient from #191919 to #191919 with a soft #ff9d29 glow behind the centre, subtle floor shadow, empty centre area where a screenshot will be placed. Lighting: low-key, moody directional light with deep shadows. Aspect ratio 4:3. No text, no letters, no logos, no watermarks, no brand marks or trademarked products, no recognisable real people. No UI elements.`
- Build the UI itself in HTML/CSS with realistic sample data from YOUR product (or screenshot your real app). Don't generate UI as an image and don't reuse the reference's screenshots. Stock/AI is only for the backdrop or device frame.
### Slot 2 · 5. Features → photography
- Photography, seen in the capture (map). (measured from the screenshot) Count: a set of ~3 in one consistent style. Aspect: 4:3. Look first: [ref 1](https://uidiscovery.com/media/captures/launchdarkly/s-05.webp)
- **Stock** — “3d glass shapes render close up dark”: [Unsplash](https://unsplash.com/s/photos/3d-glass-shapes-render-close-up-dark?orientation=landscape) · [Pexels](https://www.pexels.com/search/3d%20glass%20shapes%20render%20close%20up%20dark/?orientation=landscape) · [Pixabay](https://pixabay.com/images/search/3d%20glass%20shapes%20render%20close%20up%20dark/?orientation=horizontal)
- **Generate** — `Photograph: 3d glass shapes render close up. Composition: tight crop, identical framing and background across the whole set. Lighting: low-key, moody directional light with deep shadows. Warm colour grade that sits on #191919, #ff9d29. Photorealistic, natural textures, shallow depth of field, 35mm lens. Aspect ratio 4:3. No text, no letters, no logos, no watermarks, no brand marks or trademarked products, no recognisable real people.`
### Slot 3 · 6. Features → photography
- Photography, seen in the capture (people). (measured from the screenshot) Count: 1–3 key visuals; the rest are icons/avatars. Aspect: 4:3. Look first: [ref 1](https://uidiscovery.com/media/captures/launchdarkly/s-06.webp)
- **Stock** — “minimal desk with laptop close up dark”: [Unsplash](https://unsplash.com/s/photos/minimal-desk-with-laptop-close-up-dark?orientation=landscape) · [Pexels](https://www.pexels.com/search/minimal%20desk%20with%20laptop%20close%20up%20dark/?orientation=landscape) · [Pixabay](https://pixabay.com/images/search/minimal%20desk%20with%20laptop%20close%20up%20dark/?orientation=horizontal)
- **Generate** — `Photograph: minimal desk with laptop close up. Composition: tight crop, identical framing and background across the whole set. Lighting: low-key, moody directional light with deep shadows. Warm colour grade that sits on #191919, #ff9d29. Photorealistic, natural textures, shallow depth of field, 35mm lens. Aspect ratio 4:3. No text, no letters, no logos, no watermarks, no brand marks or trademarked products, no recognisable real people.`
- **Icons** — 7. Footer: Use one open-source icon set at one stroke weight — Lucide, Phosphor or Heroicons (MIT) — tinted with the text or accent token. Social icons: Simple Icons.
### If the screenshots show a different style
Open the refs first and name what you actually see (photo / product UI / illustration / abstract gradient or 3D / type only). If it differs from the guess, switch routes — UI is built in code, type-only needs no image, otherwise:
- **abstract 3D / gradient** — generate `Abstract 3D render: soft, glossy glass-like shapes and a smooth gradient in #ff9d29 and #d1d6d9 on a #191919 background. Lighting: low-key, moody directional light with deep shadows; warm tone. Minimal and calm, generous negative space on one side for text. Aspect ratio 16:9. No text, no letters, no logos, no watermarks, no brand marks or trademarked products, no recognisable real people.` · stock: [“abstract dark gradient 3d” on Unsplash](https://unsplash.com/s/photos/abstract-dark-gradient-3d?orientation=landscape) (same query works on Pexels/Pixabay)
- **illustration** — generate `Flat vector illustration: abstract gradient mesh, friendly simplified shapes, limited palette of #191919, #ff9d29 plus one soft neutral, plenty of empty background, consistent line weight, warm mood. Aspect ratio 16:9. No text, no letters, no logos, no watermarks, no brand marks or trademarked products, no recognisable real people.` · stock: [“technology flat illustration” on Unsplash](https://unsplash.com/s/photos/technology-flat-illustration?orientation=landscape) (same query works on Pexels/Pixabay)
- **Licences:** Unsplash and Pexels images are free for commercial use under their own licences; Pixabay under the Pixabay Content License. Check each image's page before use, credit the photographer when asked (good practice anyway), and skip images showing logos, trademarks, branded products or identifiable people without a release.
- **AI generation:** the prompts work with any image model (GPT Image, Imagen, Flux, Midjourney, Firefly, SDXL…) — check its commercial-use terms. Never put the reference brand's name or “in the style of <brand>” in a prompt.
- **Never** download, trace or re-host the reference's own images, illustrations, product shots or logos.
## 7. Build steps
1. Confirm brand, product, audience and the primary action with the user.
2. Set up the tokens (CSS variables / Tailwind @theme) and load the fonts.
3. Build the sections in order, mobile-first, with each reference screenshot open.
4. Write original copy for every slot — match length and tone, never the words.
5. Source every image via the imagery plan (stock or generated); compress it and record credits.
6. Run the checklist at 390 / 768 / 1440px and fix what fails.
## 8. Acceptance checklist
- [ ] Responsive at 390px, 768px and 1440px — no horizontal scroll, tap targets ≥ 44px on mobile.
- [ ] Colour contrast WCAG AA: 4.5:1 body text, 3:1 large text and UI; visible focus states; full keyboard navigation.
- [ ] Semantic HTML: one <h1>, ordered headings, landmarks (header/nav/main/footer), labelled form fields, alt text on meaningful images.
- [ ] Performance: modern image formats with width/height set, lazy-load below the fold, ≤ 2 font families with font-display: swap, LCP < 2.5s.
- [ ] prefers-reduced-motion respected; animations under ~300ms and never blocking content.
- [ ] Originality: no copied logos, images, illustrations or copy from the reference; every image licensed or generated; credits recorded.
## 9. If you use Next.js + Tailwind
Paste the @theme block into globals.css, load fonts with next/font/google, make each section a server component in components/sections/, use next/image with explicit sizes, and keep client components for interactive bits only (menus, toggles, accordions).
---
More: tokens https://uidiscovery.com/api/v1/sites/launchdarkly/tokens · kit https://uidiscovery.com/api/v1/sites/launchdarkly/kit · MCP `get_design_brief({ slug: "launchdarkly" })`, `get_image_plan({ slug: "launchdarkly" })`. Cite the reference as https://uidiscovery.com/sites/launchdarkly.
