Lovable vs Bolt vs v0: how their websites differ

Lovable vs Bolt vs v0 is usually a question about which builder to use. This comparison looks at the other side: what each one's websites look like from the outside, and how to tell them apart when you land on one. It's a practical companion to our builder fingerprint guide.

At a glance

	Lovable	Bolt	v0
Made by	Lovable (formerly GPT Engineer)	StackBlitz	Vercel
Framework	Vite + React	Usually Vite + React	Next.js
Styling and components	Tailwind CSS, shadcn/ui	Tailwind CSS, often shadcn/ui	Tailwind CSS, shadcn/ui
Own hosting	lovable.app	bolt.host	vusercontent.net, v0.app
Clearest tell on a custom domain	gptengineer.js script, /lovable-uploads/	x-powered-by: Bolt.new header	generator meta tag naming v0
Default title	Lovable App or the Vite default	The Vite default	v0 App
Free-plan badge	Edit with Lovable	Made with Bolt	Built with v0

Why their sites look the same

All three generate the same kind of front end: React components styled with Tailwind CSS, built from shadcn/ui's buttons, cards and dialogs. Language models also share the same taste in layouts and colours. The result is the familiar gradient hero and three feature cards, whichever builder you start with. We explain the causes in why AI-generated websites all look the same.

Lovable sites

Lovable leaves more traces than most. Look for the gptengineer.js script from cdn.gpteng.co, images under /lovable-uploads/, data-lov-id attributes in preview builds, and default meta tags such as the description Lovable Generated Project. Lovable apps often use Supabase for data and sign-in. Full guide: how to tell if a website was built with Lovable.

Bolt sites

Bolt's hosting stamps a response header, x-powered-by: Bolt.new, which survives on custom domains as long as Bolt serves the site. Free sites carry a badge from bolt.new/badge.js. Inside the page, a Bolt site is often indistinguishable from a Lovable one. Full guide: how to tell if a website was built with Bolt.

v0 sites

v0 is the odd one out because it generates Next.js. Its sites load scripts from /_next/static/, which rules out a default Lovable or Bolt project. Look for v0's generator tag, the description Created with v0 or the title v0 App. v0 projects usually deploy to Vercel, but so do huge numbers of hand-built Next.js sites, so the host alone proves little. Full guide: how to tell if a website was made with v0.

A quick way to tell them apart

1. Check the address. lovable.app, bolt.host or vusercontent.net answers it.
2. Check the framework. /_next/ in the source points toward v0 (or any Next.js site); a Vite bundle like /assets/index-*.js points toward Lovable or Bolt.
3. Check the scripts. gptengineer.js means Lovable.
4. Check the headers. x-powered-by: Bolt.new means Bolt.
5. Check the head of the source. A v0 generator tag or v0 App title means v0.

If none of these match, the honest answer is "possibly vibe coded, builder unknown". The shared look is never enough to name one of the three.

Kitsuvo, our no-AI web browser, runs these checks on every page you open, names the builder when a fingerprint matches, and filters likely AI-built results out of your searches.