What Is Lucide Icons?
LibraryLucide is an open-source icon library — a community fork of Feather Icons — with more than 1,500 consistent, stroke-based SVG icons and official packages for React, Vue, Svelte, Angular and plain JavaScript. It is the default icon set of shadcn/ui, which is why it appears on so many sites built with modern React starters and AI app builders.
Detect Lucide Icons on any website:
Why Lucide Icons Matters
Libraries and third-party services are where a site's real behaviour lives: analytics, payments, auth, UI components and animation all arrive as scripts the browser can see. Knowing that Lucide Icons is on a page tells you about its dependencies, its privacy footprint, and sometimes its build pipeline — and it helps you tell template-driven stacks from hand-assembled ones. We've fingerprinted Lucide Icons on 30 live sites in our database, so the answers here are grounded in real scan data — not marketing copy.
Does Lucide Icons Mean a Site Was Built With AI?
Lucide Icons on its own does not prove AI involvement.
Frequently bundled by default in AI-generated starter templates (e.g. shadcn/ui), but is not an AI-specific signal on its own.
How this feeds the score: builder fingerprints, bundle artifacts and AI-tool traces are weighed separately from stack context like frameworks, libraries and hosting. The full breakdown is on How scores work.
How Websites Using Lucide Icons Work
- Inline SVG icons with the `lucide` or `lucide-<name>` class and 24×24 viewBox, 2px stroke, round line caps
- Tree-shakeable per-icon imports (`lucide-react`, `lucide-vue-next`, `lucide-svelte`)
- Ships as the default icon set in shadcn/ui, v0, Lovable and Bolt starter templates
- ISC-licensed, no attribution requirement, released on npm and via the unpkg/jsDelivr CDN
Best Practices When Working With Lucide Icons
Based on patterns in our scan dataset and the detection evidence tiers.
- →Start by running a Lucide Icons detection scan on any URL you're evaluating — the 80+ signal engine returns a confidence score plus the exact markers it matched, which beats reading view-source by hand.
- →Cross-check the result against the full detection evidence in /how-scores-work — confidence tiers tell you whether a match is strong (headers + scripts) or circumstantial (a single HTML pattern).
How we detect Lucide Icons — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How Our Detector Identifies Lucide Icons
Our scanner analyzes multiple layers of a website's technical fingerprint to detect Lucide Icons usage.
- Inline <svg> elements carrying the `lucide` class or `data-lucide` attribute
- Script URLs referencing lucide.dev, lucide-react or unpkg.com/lucide
- The `lucide-` icon name prefix in rendered class attributes
Websites Built With Lucide Icons
Real sites detected by our scanner
What Lucide Icons Sites Usually Run Alongside
Technologies detected on the same domains as Lucide Icons in our most recent scans. Counts are unique domains, not page views.
Frequently Asked Questions About Lucide Icons
What is Lucide Icons?+
Lucide is an open-source icon library — a community fork of Feather Icons — with more than 1,500 consistent, stroke-based SVG icons and official packages for React, Vue, Svelte, Angular and plain JavaScript. It is the default icon set of shadcn/ui, which is why it appears on so many sites built with modern React starters and AI app builders.
Does Lucide Icons mean a website was built with AI?+
Lucide Icons on its own does not prove AI involvement. Frequently bundled by default in AI-generated starter templates (e.g. shadcn/ui), but is not an AI-specific signal on its own.
Why does Lucide Icons matter?+
Libraries and third-party services are where a site's real behaviour lives: analytics, payments, auth, UI components and animation all arrive as scripts the browser can see. Knowing that Lucide Icons is on a page tells you about its dependencies, its privacy footprint, and sometimes its build pipeline — and it helps you tell template-driven stacks from hand-assembled ones. We've fingerprinted Lucide Icons on 30 live sites in our database, so the answers here are grounded in real scan data — not marketing copy.
How do we detect Lucide Icons?+
Our scanner checks for these signals: Inline <svg> elements carrying the `lucide` class or `data-lucide` attribute; Script URLs referencing lucide.dev, lucide-react or unpkg.com/lucide; The `lucide-` icon name prefix in rendered class attributes. Each match contributes to a confidence score, and the full evidence tiers are documented at /how-scores-work.
How many websites using Lucide Icons are in the database?+
We've fingerprinted 30+ live sites built with Lucide Icons across our scan dataset. The list refreshes as new scans come in.
What are the typical characteristics of a Lucide Icons website?+
Inline SVG icons with the `lucide` or `lucide-<name>` class and 24×24 viewBox, 2px stroke, round line caps. Tree-shakeable per-icon imports (`lucide-react`, `lucide-vue-next`, `lucide-svelte`). Ships as the default icon set in shadcn/ui, v0, Lovable and Bolt starter templates. ISC-licensed, no attribution requirement, released on npm and via the unpkg/jsDelivr CDN
Related Tools & Technologies
Other libraries and services we detect
Ready to put Lucide Icons detection to work?
You now know what Lucide Icons is, why it matters, how to spot it, and where the detection signals come from. The next step is using that knowledge on a real URL — yours, a competitor's, or a prospect's.