Why do AI-generated websites all look the same?
The purple gradient, the pill badge, the three feature cards. There are concrete reasons AI builders keep producing the same page, and they tell you something about how it was made.
If AI-generated websites look the same to you, you're in good company. People describe them as "the purple gradient sites": a soft indigo-to-violet hero, a small pill-shaped badge above a big headline, a "Get started" button, three feature cards with an icon each, a testimonial strip and a pricing table. One self-published analysis that scanned 3.2 million Reddit posts found about 47,000 of them were about AI-built sites; "they all look the same" came up in about 13% of those, among the loudest complaints.
The sameness isn't an accident or a coincidence. It has specific causes, and knowing them helps you read what a design does and doesn't tell you.
1. The same starting templates
AI app builders don't start from a blank page. Lovable, Bolt and many others start new projects from a React and Vite template; v0 starts from Next.js. Each template has a default layout, default spacing and default colours. When the person prompting doesn't ask for something specific, those defaults survive into the finished site.
2. The same component library
Almost every AI builder generates its buttons, cards, dialogs and forms with shadcn/ui, a popular open-source collection of React components built on Tailwind CSS and Radix UI. The components are well made and look good out of the box, which is exactly why they're everywhere. It also means the cards on one AI-built site have the same corner radius, border, shadow and padding as the cards on thousands of others. More in is shadcn/ui a sign a site was made with AI?
3. Tailwind's indigo
Tailwind CSS, the styling framework underneath most of these sites, ships with a colour palette, and its own official examples leaned heavily on indigo for years. That indigo ended up in countless tutorials, templates and open-source projects. Tailwind's creator, Adam Wathan, has joked publicly about owing the internet an apology for it. Language models learned from all that code, so when they need "a nice primary colour", indigo, violet and a gradient into purple or pink are the safest bet.
Kitsuvo's detector counts classes like from-indigo-500, via-purple- and to-pink- as one design signal for exactly this reason.
4. Models choose the most common answer
A language model generating a landing page produces the most likely landing page given everything it has seen. The most likely modern SaaS page has a centred hero, a badge, a headline with a highlighted word, two buttons, a logo strip and a three-column feature grid. Unless the prompt pushes hard in another direction, the result regresses to that average.
5. The same words
The copy comes from the same models, with the same favourite phrases, such as unlock
, elevate
and seamlessly
. Identical wording makes different layouts feel even more alike. We cover the phrase list in the phrases that give away AI-written website copy.
6. Nobody does a design pass
Vibe coding is fast. The person building often isn't a designer and is happy once the page works. The defaults ship, and the sameness ships with them. Sites where someone changed the fonts, colours and layout stop looking "AI" very quickly, even though they were generated just the same.
The design tells, and how much they mean
| Design tell | What it suggests | Weight |
|---|---|---|
| Indigo or violet gradient hero | Tailwind defaults left in place | Weak |
| Pill badge above the headline | Common template section | Weak |
| Three icon cards, then testimonials, then pricing | Stock landing-page sequence | Weak |
| shadcn/ui class names in the source | A popular component library | Weak |
| Untouched template title or favicon | Nobody finished the metadata | Medium |
| Builder script, domain or header | The builder itself | Strong |
Design tells add up, but they never become proof, because the same tools are used by human developers. A designer who starts a project with Tailwind and shadcn/ui on a Sunday afternoon will produce something very close to an AI-generated page. That is why Kitsuvo only names a builder when it finds a fingerprint, as described in how to tell if a website was made with AI.
Does the sameness matter?
For a visitor, mostly not. A florist's site that looks like a SaaS landing page still sells flowers. It matters in two places: when a page uses a familiar polished look to borrow trust it hasn't earned, as scam shops and phishing pages do, and when hundreds of identical pages crowd search results, which is where AI slop comes in.
Kitsuvo, our no-AI web browser, weighs design as one quiet signal among many, and shows each one in the evidence list so you can decide what it means. A look alone can't name a builder; how to tell if a website was built with an AI builder covers the traces that can.
Questions people ask
Why are so many AI websites purple?
Tailwind CSS, which most AI builders use, made indigo prominent in its examples for years, and that colour spread through templates and open-source code that language models learned from. Indigo, violet and purple-to-pink gradients became the default "safe" choice.
Can a website look AI-generated but be made by a person?
Yes. Designers and developers use the same tools, especially Tailwind CSS and shadcn/ui. A look alone is never enough to say a site was generated.
How do I make my AI-built site look less generic?
Change the colour palette and fonts, replace the template section order, use your own photos, and rewrite the copy with specific facts about your business. Small changes to the defaults go a long way.