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A design system is a shared kit for building a product or website. It holds the reusable parts, like buttons, cards and page sections, plus the rules for using them.
Most design systems live in two places at once: a library in a design tool like Figma, and matching components in code. When both use the same names and values, design and build stay in sync.
Why a design system matters for conversion
Marketing sites change constantly. New landing pages, launches, campaigns and tests all need pages, often at short notice.
A design system means those pages get built from proven parts instead of from scratch. A new landing page can be assembled in hours from sections that already look right and load fast.
That speed matters for testing. When building a variant is cheap, you can run more A/B tests and learn what actually moves sign-ups.
Consistency matters too. Buttons that look and behave the same everywhere are easier to recognise, which helps your visual hierarchy do its job.
What goes into a marketing site design system
| Layer | What it includes | Example |
|---|---|---|
| Design tokens | Named values for colour, type, spacing, radius, shadows | color-primary, text-lg, space-6 |
| Base components | Small building blocks | Buttons, links, inputs, badges, icons |
| Patterns | Combinations of components | Cards, logo bars, testimonials, pricing tables |
| Page sections | Full width blocks you can stack | Hero, feature grid, FAQ, CTA band |
| Guidelines | How and when to use each part | “One primary button per section” |
For a marketing site, the page sections layer is the one that pays off most. It’s what lets non-designers build pages that still look on brand.
Design system vs style guide vs component library
These terms overlap, so here’s the short version.
A style guide describes the brand: logo, colours, fonts and voice. It’s a reference, usually a document.
A component library is a set of built parts in code or in a design tool.
A design system includes both, plus tokens and the rules that tie them together. It’s the whole system, not just the parts.
Design system best practices
- Start with what you use. Audit your current pages and build components for the patterns that repeat. Don’t design for imaginary needs.
- Name tokens by role, not value. “color-text-muted” survives a rebrand. “grey-500” doesn’t explain its job.
- Keep design and code in step. If Figma and the codebase drift apart, people stop trusting either.
- Document the why. A short note on when to use each component saves a lot of review back and forth.
- Give it an owner. Someone needs to approve new components, or the system fills up with near duplicates.
Common design system mistakes
- Building too much too early. A huge system nobody uses is worse than a small one everybody does.
- Too many variants. Twelve button styles means no standard button.
- Treating it as finished. A design system is a product. It needs updates as the site and brand grow.
- Locking out marketing. If the team can’t build a page without a developer, the system isn’t serving its main users.