Builder.io is a visual headless CMS and experience management platform that lets marketing and product teams visually edit content on any website or app built with any frontend framework — React, Vue, Angular, Next.js, or even native mobile apps. Unlike traditional CMSes, Builder.io uses a visual drag-and-drop editor that overlays directly on the live site, letting non-developers make layout changes without touching code. It's used by enterprise teams at companies like Microsoft, Snap, and Everlane for landing pages and experiment-driven content. Sites using Builder.io load scripts from cdn.builder.io and include builder-component, builder-block, and builder-content-id attributes throughout the DOM markup — these are the primary detection fingerprints. The Builder.io query API is accessed from builder.io/api/v1/ endpoints. Pricing starts at a free tier, with Growth plans from $10/month.
Paste any URL to instantly detect whether it was built with Builder.io. Our engine checks 5 technical signals.
Builder.io is used across many industries. These are the most common website types built on this platform:
Solo founders
Build and ship full-stack apps from natural language prompts
Early-stage startups
Validate ideas with working prototypes instantly
SMBs
Create internal tools without hiring developers
Developers
Bootstrap projects faster with AI assistance
Every Builder.io website leaves distinctive technical fingerprints. Here's what to look for:
CDN Domains
Network requests to these domains are a reliable indicator:
cdn\.builder\.ioJavaScript Patterns
2 script patterns linked to Builder.io
HTML Attributes
2 HTML patterns in the page source
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