Lovable builds full React apps from prompts, which means it makes more decisions per generation than a pure UI tool — routing, state, data, and the design. Left unspecified, every one of those decisions regresses to a default. Polished first-run output comes from prompts that pin the design decisions down and explicitly fence off the rest.
Separate the design brief from the feature brief
The single biggest improvement: structure the prompt in two labelled halves.
Design: dark editorial landing page, near-black base, single violet accent (hsl(271 91% 65%)), oversized serif display headlines, thin hairline dividers, no cards-with-shadows anywhere. Build: single page, no routing, no backend, no auth. Static content only.
Lovable is eager to scaffold features. Telling it what not to build keeps the generation budget on visuals.
Be literal about the stack surface
Lovable outputs React + Tailwind. Prompts that speak that language get followed more precisely: name Tailwind utilities ("rounded-2xl, border-white/10, backdrop-blur"), name the font loading ("Inter from Google Fonts, weights 400/600"), name spacing in rem. Vague adjectives translate loosely; utility names translate exactly.
One section, one sentence of intent
For each section, give a one-line purpose before the layout. "Social proof section whose job is to make the product feel established: two rows of grayscale logos, then a single large customer quote in display type." Purpose-first phrasing measurably reduces the odds of a filler section.
Iterate with edits, not regenerations
Lovable keeps context. After the first run, prefer surgical follow-ups — "double the hero vertical padding, drop the third feature card, make the CTA full-width on mobile" — over re-pasting a modified mega-prompt. Regenerating from scratch re-rolls every decision including ones that were already right.
Steal a starting point
A tested library prompt beats a blank page: it already contains the art direction, type scale, and the negative constraints that keep Lovable away from its defaults. We keep 60 prompts free, no account — paste one into Lovable as-is, then apply the edit loop above. The sections collection is useful when you are assembling a page piece by piece. And if the output still drifts generic, the checklist in this post is builder-agnostic.