We measure it rather than eyeball it: document scrollWidth versus window.innerWidth at seven widths from 390 to 2560 px. Every page passed at 390.
That is the one criterion where the whole field is solid. The failures show up elsewhere: empty front pages, hash-routed URLs, inert forms, placeholders in the footer.
Layout is the part these tools have solved. Plumbing is not.
Where this comes from
Other answers from the runs
- Can Lovable build a booking site?
- Does the /admin page work in Bolt.new?
- Why is the 10Web homepage empty?
- Does Durable generate fake testimonials?
Every answer here is derived from a published run with screenshots and logs. How we test: methodology.