We measured 200 public Lovable sites (median score 61/100) but did not have a sample for v0, so the numbers below cover one side only. The rest of the page compares how each builder can be recognised and what its sites usually get wrong.
Side by side
from our study of 780 public sites
Lovable
v0
Type
AI builder (site written from a prompt)
AI builder (site written from a prompt)
Default hosting
*.lovable.app
v0-*.vercel.app
Sites in our sample
200
not measured
Median site score
61/100
not measured
Sites with a critical problem of their own
38%
not measured
Call a Supabase database from the browser
34.5%
not measured
No main heading (H1)
70.5%
not measured
No meta description
0.5%
not measured
Zoom disabled on phones
2%
not measured
Builder badge left on
66.5%
not measured
Highlighted: the better of the two on that row. Lower is better for every percentage.
Telling them apart
Lovable
How to spot it: Open the page source (Ctrl+U) and search for gpteng.co. Lovable projects load their editor script from that host.
What usually goes wrong: API keys left in the JavaScript bundle. Lovable projects often talk to Supabase or another backend straight from the browser, so the key ends up in a file anyone can download. If that key is a service role key rather than an anonymous one, the whole database is readable. Our scanner downloads up to three bundles and reports any key it finds, redacted.
How to spot it: Search the page source for generator. If the content is v0.app or v0.dev, it is v0.
What usually goes wrong: Copied and never finished. v0 output is a starting point. Sites shipped straight from it often keep placeholder copy, "Your Company" links and buttons that go nowhere, which reads as unfinished to a visitor.
Can you tell whether a site was built with Lovable or v0?
Usually, yes. Each leaves its own traces: Lovable on *.lovable.app and in its scripts, v0 on v0-*.vercel.app and in its own markers. Paste the URL in the scanner above and it names the builder with the evidence it found.
Which is better for SEO, Lovable or v0?
Neither decides it alone. In our sample the biggest SEO gaps were a missing main heading and a missing meta description, both fixable on either platform. Compare the rows above, then scan your own site to see which of them apply to it.
Is a Lovable site worse than a hand-built one?
Not by being AI-built. The problems we see most are defaults nobody changed: titles, badges, blocked zoom, and database keys used without access rules. Each is a short fix once you know it is there.
Numbers from The AI-built web, October 2026: public sites on each builder's own hosting, scanned once. Read the method and its limits there.
Lovable