SlopCop

SlopCop is a free web tool that scores any website for how much its design looks like it was made by AI. You paste in a URL, it loads the page, and it tells you whether the look leans into the visual habits that have quietly become the fingerprint of the AI-era, vibe-coded landing page. The result is a single readout of how much slop the design is carrying, framed by the question the site itself leads with, which is how AI-generated does this website look.

The problem it names is one a lot of people have felt without quite being able to describe it. Since design assistants and template-heavy site builders took over, a huge share of new pages have started to look eerily alike, with the same fonts, the same gradients, and the same centered hero holding a little badge above the headline. SlopCop puts an actual number on that sameness instead of leaving it as a vague hunch you can't defend in a design review.

The analysis runs in a real headless browser rather than off a screenshot or a guess. SlopCop loads each page with Playwright, then walks the live DOM and reads the computed styles to check for a set of more than a dozen concrete patterns. Every pattern is a deterministic CSS or DOM query, so the outcome is repeatable and explainable rather than a mood. It pointedly does not use a language model to grade the page, and that's a deliberate choice, because an AI judge would smuggle in the very bias the tool exists to measure.

The patterns it hunts for read like a catalogue of modern landing-page reflexes. Think Inter set everywhere, the Space Grotesk and Instrument Serif pairing, serif italics on accent words, lavender and vibe-purple highlights, dark sections with low-contrast body text, gradient glows, cards with colored left borders, identical feature tiles that each carry an icon, numbered step sequences, stat banners, sidebars dotted with emoji, and all-caps section labels. Trip four or more of them and the page lands in the heavy-slop bucket, while lighter results get marked as clean or mild.

The scoring is meant to be read as a spectrum rather than a pass-or-fail stamp. A page that only nudges one or two checks is treated as broadly clean, a handful lands it in the mild zone, and the heavy bucket is reserved for the sites that pile the tells on top of each other. Because each hit is tied to a named pattern, the score arrives with its own explanation, so you're never left guessing which choices pushed a page up. That makes it useful as a checklist as much as a grade, since you can walk down the triggered items and decide which ones are worth changing and which are fine to keep.

The tool is refreshingly upfront that this is a fuzzy signal, not a verdict. Plenty of careful, hand-designed sites trip the same checks, because the aesthetic has gone close to universal, and the author openly reports something in the range of five to ten percent false positives. That candor is part of the appeal. It grew out of a project where the author scored batches of new launches for these design tells, and it kept that experimental, show-your-work spirit rather than pretending to be an oracle.

What sets it apart from the wider wave of AI detectors is that it studies design, not text. Most detectors try to sniff out AI writing, whereas SlopCop measures the look of a page, the typefaces, the spacing habits, and the hero conventions, using transparent rules you can actually read. It ships with a browsable gallery of scored sites and a patterns reference that explains each signal one by one, so you can see exactly why a given page earned its score and what you'd change to pull it back down.

It's worth being clear about what SlopCop is not. It isn't trying to shame anyone or to claim a site is low quality, and the author is explicit that the look it measures has become the default across the whole web, human-made pages included. The value is diagnostic. If you're a founder who wants a launch to stand out in a sea of near-identical pages, or a designer defending a more distinctive direction to a client, having a concrete, reproducible read on how conventional a page looks is a genuinely useful thing to point at.

It's aimed at designers, founders, and developers who want a quick gut-check on whether a new page reads as distinctive or as one more entry in the template pile. Access could hardly be lighter. It's free with nothing to sign up for, there's a try-a-random-website button if you just want to play with it, and the whole project is open source on GitHub, so you can read the exact checks, run them yourself, or propose new patterns as the AI-design aesthetic keeps drifting. For anyone worried their site has slid into look-alike territory, it works as a fast and honest mirror.