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Is This Website Built With Bolt?

Paste any URL below. Our scanner checks 12 Bolt-specific fingerprints — scripts, CDN domains, HTML attributes, and HTTP headers — and returns a confidence score instantly.

How to Tell if a Website Uses Bolt

Identifying whether a website was built with Bolt used to require technical expertise — inspecting source code, tracing network requests in DevTools, and knowing which patterns to look for. Our free scanner automates all of that: it fetches the page, analyzes 12 Bolt-specific signals, and returns a verdict with a confidence score.

You might want to detect Bolt for competitive research, due diligence before acquiring a site, or simple curiosity. Whatever the reason, this page covers every method — automated and manual.

What is Bolt?

Bolt.new is an AI-powered full-stack web application builder by StackBlitz that runs a complete Node.js environment directly in the browser using WebContainers technology. Unlike most AI builders that hide the generated code, Bolt gives developers full visibility and editability of every file — enabling installation of any npm package, use of any framework (React, Vue, Svelte, Astro), and deployment to any infrastructure. It's the preferred AI builder for developers who want AI-accelerated productivity without sacrificing code ownership or framework flexibility. Bolt-generated apps follow standard web development patterns and deploy instantly via one-click integrations with Netlify. Pricing starts with a free tier and scales to Pro from $20/month for heavier usage.

It is primarily used for marketing sites, landing pages, portfolios, and business websites — all generated from prompts or visual editors with AI assistance.

Visit Bolt official website

Signs a Website Is Built With Bolt

Our detection engine checks 12 unique Bolt fingerprints. Here are the most reliable signals:

High Confidence

CDN Domain

Assets (images, scripts, fonts) are loaded from Bolt-specific CDN domains. This is one of the most reliable signals because CDN domains are hard to hide.

bolt.hoststackblitz.io
High Confidence

JavaScript / Script Files

Bolt loads specific JavaScript runtime files or loads scripts from identifiable URLs. Checking script src attributes reveals the platform.

bolt.newbolt.hoststackblitz
High Confidence

HTTP Response Headers

Bolt-hosted sites respond with specific HTTP headers that identify the platform or infrastructure. These are visible in DevTools → Network tab.

serverx-powered-by
Medium Confidence

HTML Attributes & Class Names

Bolt injects proprietary class names, data attributes, or markup patterns into the page HTML that are unique to the platform.

bolt-projectstackblitzdata-bolt
Medium Confidence

Meta Tags

Some Bolt sites include a generator meta tag or other platform-specific meta elements in the document head.

bolt.newbolt

How to Manually Detect Bolt Websites

Method 1 — View Page Source

  1. Open the website in your browser
  2. Press Ctrl+U (Windows) or Cmd+Option+U (Mac)
  3. Search (Ctrl+F) for bolt or bolt
  4. If found in script src, class names, or meta tags — it's likely Bolt

Method 2 — Browser DevTools Network Tab

  1. Press F12 to open DevTools
  2. Click the Network tab and reload the page
  3. Filter by bolt in the search box
  4. If you see requests to Bolt-specific domains, it's confirmed
Faster: Skip the manual steps — paste the URL into our scanner above and we check all 12 signals in seconds.

How Our Bolt Detector Works

When you submit a URL, our engine fetches the page from its server — just like a browser would — then analyzes the response across 12 Bolt-specific fingerprints:

Script analysis

We scan all loaded JavaScript files for known CDN paths and runtime names

CDN domain matching

We cross-reference every asset request against known platform CDNs

HTML pattern scanning

We search the DOM for platform-specific class names and data attributes

Header inspection

We read HTTP response headers that identify the server or platform

Meta tag extraction

We check generator and other meta tags in the document head

Confidence scoring

We weight each matched signal and normalize to a 0–99% score

How to Build a Similar Website With Bolt

Sign up at https://bolt.new and describe your website in plain language. The AI generates a complete site in seconds that you can customize, connect a domain to, and publish.

Other popular AI website builders include Framer, Durable, Lovable, Gamma, and Mixo.

Get started with Bolt

Frequently Asked Questions

How can I tell if a website was built with Bolt?

The most reliable ways to detect Bolt are: (1) open DevTools → Network tab and look for requests to Bolt-specific CDN domains, (2) view page source and search for Bolt-specific class names or data attributes, (3) use our free scanner — we check 12 detection signals automatically and return a confidence score.

Is your Bolt detector free?

Yes, completely free. Paste any URL into our scanner and we'll analyze it for Bolt fingerprints immediately. No account required, no limits on scans.

How accurate is the Bolt detection?

We check 12 unique Bolt fingerprint signals across HTML, JavaScript, CDN domains, meta tags, and HTTP headers. Our confidence score reflects how many signals matched — a score above 70% is a strong indicator. We cap accuracy at 99% to reflect that all fingerprint-based detection is probabilistic.

Can Bolt sites be detected if they use a custom domain?

Yes. Custom domains don't hide the underlying platform. The JavaScript files, CDN requests, HTML attributes, and server headers all remain identifiable regardless of the domain name used. Our scanner fetches the page directly and analyzes its technical composition.

What should I do after detecting a Bolt website?

If you want to build something similar, visit https://bolt.new to learn more or sign up. If you're doing competitive research, our scan result also shows the full technology stack — including hosting platform, domain age, and other detected technologies. You can share the result link with your team.