Best AI-generated website detectors compared (2026)
Seven tools answer one question: was this site built with an AI builder. They differ in what they read, where they run, what they cost and how much they admit they do not know.
An AI-generated website detector tells you whether a site was probably built with an AI app builder such as Lovable, Bolt or v0. The tools below do it by reading how a page is built, and none of them proves anything: they are estimates. This roundup lists seven AI-generated website detectors, from web checkers to extensions to a browser, ordered by how you use them and not by quality.
We make Kitsuvo, which is the last entry, so weigh our view with that in mind. Each entry says where its tool is the wrong choice, ours included. Facts about the other tools come from their own pages as read on October 10, 2026, and the sources are listed at the end. Limits, prices and builder counts change, so check a tool's page before you rely on a number.
At a glance
| Tool | What it does | Platforms | Price | Open source? | Limits |
|---|---|---|---|---|---|
| AI Website Detector | Paste a URL; returns a 0 to 99% AI probability, the builder, signals and a screenshot | Web, with an API | Free tier; API plans from 12 euros a month | Hosted service | Free scans are capped; sites without clear fingerprints get an estimate |
| Is That Vibe Coded | Paste a URL; returns a 0 to 100% score with a "why this score" list | Web, with an MCP server | Free, no signup | Hosted service | Says detection is best effort, not forensic |
| SEOJuice Vibe-Coded Detector | Paste a URL; returns YES, MAYBE, NO or INCONCLUSIVE with a 0 to 100 score | Web | Free, no signup | Hosted service | A heuristic; content signals are tuned to English |
| VibeEval Lovable Detector | Paste a URL; checks for Lovable only | Web | Free check; the security scan has a 14-day trial | Hosted service | Lovable only; hand-built Vite and Supabase apps can look like Lovable |
| Vibe Coding Detector by A5 | Scores the open tab with local rules; Likely, Unclear or Unlikely | Chrome | No price listed | Not stated | Chrome only; last updated February 6, 2026 |
| Vibe - Detect AI-Generated Websites | Scans the open tab for visual and content patterns | Chrome | No price listed | Not stated | Leans on design and copy cues that people also produce |
| Kitsuvo | Scores every page you open from builder fingerprints, and filters search results | Mac and Windows browser; developer-preview extension for Chromium browsers and Firefox | Free; optional Plus at $6 a month | No, the browser is not open source | Judges only pages you open, and has no bulk lookup or API |
The tools
AI Website Detector
Best for: a quick answer with the signals shown, plus an API for checking many sites.
AI Website Detector fetches the page and reads HTML patterns, script tags, CDN domains, headers, meta tags, cookies and the component stack. It reports a probability, a verdict label, the builder, the signals it matched, a screenshot and the wider tech stack. Its home page says it detects 50+ builders in one place and 80+ platforms in another. Without an account it allows 10 scans per 30 minutes, and a free account allows 100 a day.
Not for: privacy-sensitive addresses, since its servers fetch every URL you submit. It also says accuracy of 85 to 99% applies to major platforms with clear fingerprints, and that sites without bundle artifacts get an estimate from stack heuristics.
Is That Vibe Coded
Best for: a free check that explains its method, or one an AI assistant can call.
Is That Vibe Coded reads the HTML, robots.txt, sitemap and DNS records, and renders the page in a headless browser. It returns a 0 to 100% score with a breakdown, keeps a separate "signs of AI-assisted development" list that does not change the score, and offers an MCP server with one check_site(url) tool. It says scans are not logged or stored. Its header cites 25+ builders.
Not for: certainty. The page itself says detection is best effort, not forensic, and that developers can remove or customize fingerprints.
SEOJuice Vibe-Coded Detector
Best for: a verdict with a fix list, if you own the site and want SEO feedback too.
The SEOJuice tool returns YES, MAYBE, NO or INCONCLUSIVE with a confidence score, and says it detects 21+ AI builders. It weights four categories: builder fingerprints 40%, code hygiene 25%, content patterns 20% and SEO basics 15%. It is free with no signup, and it describes itself as a heuristic.
Not for: a pure provenance check. Because a quarter of the score is hygiene and 15% is SEO basics, a hand-built site with weak SEO can lose points for reasons unrelated to how it was built. That is our reading, not the tool's claim. Its page also says content signals are tuned to English, and INCONCLUSIVE appears for bot blocking or script-only pages.
VibeEval Lovable Detector
Best for: asking one narrow question: is this a Lovable app?
VibeEval's Lovable detector is a paste-a-URL check, part of a security-testing product. It checks four classes of fingerprint: bundle and DOM patterns, network calls to Supabase, hosting such as *.lovable.app, and default meta tags including a data-lov-id attribute. It returns Lovable, not Lovable or ambiguous with a confidence figure. Three or more signals in a class count as a positive, two as probable and one as a hint.
Not for: other builders, or private apps: it reads public URLs only. Its own page warns that hand-built Vite and Supabase apps can cause false positives and that customized exports can cause false negatives. The page shows no publication date.
Vibe Coding Detector by A5
Best for: a Chrome user who wants a local, rule-based score with reasons.
This Chrome extension runs a rule-based model in the browser on HTML, structure, metadata and visible text, and says it does not send content to another AI. It returns Likely, Unclear or Unlikely, a confidence percentage and the reasons, with an optional debug breakdown. The listing is by Allen Five Holdings LLC.
Not for: Firefox or other browsers, since we found only a Chrome listing, and the listing shows version 2026.02.03.0000, last updated February 6, 2026.
Vibe - Detect AI-Generated Websites
Best for: a free look at design and content cues, treated as a hint.
This Chrome extension lists the signals it scans for: purple and blue gradients, excessive emoji, generic taglines and placeholder content, card layouts with hover effects, missing SEO meta tags, outdated copyright years, generic testimonial names and AI-style code comments. The listing says all analysis happens locally. It is version 1.0.0, updated January 4, 2026.
Not for: naming a builder or settling a doubt. Gradients, emoji and card layouts are shared by people and by builders, so these cues can corroborate a stronger signal but cannot establish one. Our guide to which AI builder made a website explains why.
Kitsuvo
Best for: checks on every page you open, with the evidence and the builder name shown, plus filtering in search results.
Kitsuvo is our desktop browser for Mac and Windows. It scores pages from 0 to 100 using hosting domains, runtime scripts, tags and headers, names the builder when a fingerprint matches, lists the evidence, and counts traces of conventional CMSs against the score. A score of 70 or more reads as Likely AI-built, and 40 to 69 as Possibly vibe coded. It names about 20 builders. The extension is a developer preview installed from a ZIP for Chromium browsers and Firefox; it scans the current page locally without cloud requests.
Not for: one-off checks of a link someone sent you, bulk lookups or an API, where a web checker is the better tool. It judges only pages you open, needs you to use a different browser, and misses sites that removed their traces. The manual method covers the same checks by hand.
Which should you use?
- One link someone sent you: a web checker. Run it through two if the answer matters.
- A list of sites or an automated pipeline: a checker with an API or MCP server, such as AI Website Detector or Is That Vibe Coded.
- Your own site: the SEOJuice tool, which also lists what to fix.
- Suspecting one builder: the VibeEval Lovable detector for Lovable, and our Lovable guide for the traces to look for by hand.
- Passive checks as you browse: an extension, or a browser such as Kitsuvo that also filters results.
Two checkers can disagree, and either can be wrong. A score is a reason to look closer, not a verdict. For a site that will ask for a password or a card, read how to check if a website is legit instead of relying on any detector. For how the categories differ, see AI website detector tools compared and AI website detector alternatives. If you would rather keep AI-built sites out of your results than check them one by one, see best tools to filter AI-generated content from search, and for AI answers on the results page, best browsers and extensions to avoid AI answers.
What we left out
Tech-stack profilers such as Wappalyzer and BuiltWith identify technologies for sales and research teams. Their home pages do not mention AI builders, but Wappalyzer's technology directory has entries for Lovable, Base44 and other AI builders, and BuiltWith has a Lovable page, as read on October 10, 2026. What they publish describes technology lookups and lead lists, not a verdict on whether a site was AI-built, so we left them out of this list. Vibe or Not is a community voting game, and its maker says no AI detector is behind its results. Tools that guess whether text was written by AI are a different category; see are AI content detectors accurate?
Sources
All read on October 10, 2026. Free-tier limits and builder counts change.
Questions people ask
What is the most accurate AI-generated website detector?
We found no independent benchmark that ranks these tools, and each one describes its result as an estimate. Prefer a tool that shows the exact fingerprints it matched, so you can verify the call yourself.
Can a detector prove a website was built with AI?
No. Is That Vibe Coded says detection is best effort and not forensic, and SEOJuice calls its tool a heuristic. Builders change their traces, owners can remove badges and tags, and people use the same component kits.
Is there a free AI-generated website detector?
Yes. Is That Vibe Coded and the SEOJuice tool say they are free with no signup, AI Website Detector has a free tier with scan limits, and Kitsuvo is free. Check each page for current limits.
Do these tools detect AI-written text?
Mostly no. They mainly look at how a site was built, such as hosting, scripts, tags and headers. SEOJuice weights content patterns at 20% of its score and the A5 extension reads visible text, but those are cues, not a test of who wrote the copy. Detecting AI-written text is a different and less reliable task; see our guide on AI content detectors.