B R I C E K A

Lovable Detector

Instantly verify if any website was generated by Lovable.dev AI. We scan the source code for Lovable's unique runtime signatures with forensic precision.

How Lovable Detection Works

Fetch Source

We retrieve the website's HTML and all JavaScript bundle files server-side.

Scan Bundles

Every JS file is inspected for Lovable-specific identifiers and hooks.

Find Signatures

Fingerprints like __lovableEvents reveal the builder.

Verdict

We calculate confidence and list every piece of evidence found.

The Definitive Lovable.dev Website Detector

Lovable.dev (formerly GPT Engineer) is one of the most popular AI-powered website builders in 2026, capable of generating full-stack React + Supabase applications from plain English prompts. But as AI-generated websites flood the internet, designers, agencies, and researchers need a reliable way to identify them — and that's exactly what this detector does.

Unlike superficial detection methods that look at visual patterns or HTML structure, our tool performs deep source code analysis. Every Lovable-generated project ships with specific runtime hooks for error tracking, event capture, and analytics. These hooks — especially __lovableEvents, __lovableReportRuntime, and window.lovable — are injected automatically during the build process and serve as a unique forensic fingerprint.

Why Signatures Are Unmistakable

When you build a site on Lovable, the exported React bundle contains an error boundary that reports crashes to Lovable's internal telemetry via window.__lovableEvents?.captureException(). This call includes the current route, error stack, and a mechanism identifier — none of which exist in manually-coded React apps or projects generated by competitors like Bolt.new, v0.dev, or Cursor.

Additionally, Lovable deployments typically use a Vite bundler producing files named /assets/index-[hash].js, and Lovable-hosted projects live on subdomains like *.lovable.app or *.lovableproject.com. Our detector cross-references all these signals to produce a verdict with up to 98% confidence.

Who Uses This Tool?

  • Web Agencies: Audit competitor sites and understand their tooling stack before sales calls.
  • Researchers: Track AI-generated web proliferation across industries and niches.
  • Freelancers: Price projects fairly by identifying clients who used AI to generate initial drafts.
  • Security Analysts: Identify AI-generated sites that may ship with default Lovable telemetry hooks enabled.

Frequently Asked Questions

Is this detector 100% accurate?
When strong signatures like __lovableEvents are detected, the tool reports 98% confidence — these identifiers are unique to Lovable's build system. False positives are extremely rare. The only way to evade detection is to manually strip these runtime hooks post-export, which most Lovable users don't do.
What if the site is behind Cloudflare or a firewall?
Our scanner uses a standard browser user-agent and follows normal HTTP behavior, so most CDNs (including Cloudflare) allow the scan through. Highly aggressive bot protection (e.g., aggressive rate limits or JavaScript challenges) may block the request — in those cases the tool reports that the scan couldn't complete.
Can a Lovable site hide these signatures?
Technically yes, but it requires manual intervention. A developer would need to export the Lovable project, locate the runtime error boundary code, and remove every reference to __lovableEvents and related identifiers before re-deploying. Most Lovable users deploy directly from the platform, keeping all signatures intact.
Does the target site know I scanned it?
The scan looks identical to a regular visitor loading the page — standard GET requests with a Chrome user-agent. The site owner sees normal traffic logs with no special indicator. Your identity and IP are never exposed to the target site because the scan runs from our server.
Can you detect other AI website builders too?
This tool is specialized for Lovable.dev. Similar signature-based detection is possible for Bolt.new, v0.dev, Cursor-generated sites, and Replit Agent — each leaves its own runtime fingerprints in the bundled JavaScript. We're working on a multi-builder detector next.
Is the tool free to use?
Yes, 100% free with unlimited scans. No account, no credit card, no daily limits. We don't store the URLs you scan or the results — every analysis is stateless and private.