How to Write Lovable Prompts That Produce Beautiful UI

Updated 2026-07-05 · 8 min read

Lovable rewards one specific prompting style: a complete founding prompt up front, followed by small single-change iterations. Most disappointing results come from inverting that — a one-line opening prompt followed by twenty corrections.

The founding prompt: six parts

A strong founding prompt is 200–400 words and covers:

Purpose — what the page/app is and who it serves. One sentence.
Structure — the sections in order: hero, social proof, features, CTA, footer.
Design language — exact colors, typography, spacing (details below).
Copy direction — tone and real example lines. Lovable handles "confident, concrete, zero buzzwords" well; it handles lorem ipsum badly.
Motion — what animates, how fast, with what easing. Or explicitly: almost nothing.
Constraints — the "never" list. This is what separates designed output from default output.

Design language: values, not adjectives

Compare: "modern dark theme with nice accent color" versus "background #08090a, body text #8a8f98, accent #5e6ad2 used only on the primary CTA; Inter at 64px/510 weight for H1 with -1.4px letter-spacing; sections padded 128px; border-radius 8px everywhere." The second produces the site you imagined. The first produces the site the model imagines.

Combine a named reference with values: "think linear.app — dark, glassy, precise" anchors the mood, the numbers anchor the execution. Reference alone is vague; values alone lack character.

Negative constraints beat positive wishes

Models revert to their defaults under ambiguity, so close the exits explicitly:

"Never use purple-to-blue gradients on white."
"Never use emoji in headings."
"No drop shadows — separate surfaces with borders and background tints."
"The accent color appears only on CTAs and links, nowhere else."

Iterating without drift

After the first build, switch to single-change follow-ups of 5–25 words: "Increase the hero H1 to 80px." "Make the footer background #fafafa." Multi-change prompts get two things right and butcher the third. And anchor what you like: "Keep the entire hero exactly as is; only change the section below it."

A template to steal

Build a landing page for [product] aimed at [audience]. Sections: full-viewport hero, logo strip, three feature rows (alternating), final CTA, minimal footer. Design: background [hex], text [hex], accent [hex] only on CTAs; [font] for headings ([px]/[weight]), body [px]/1.6; section padding [px]; radius [px]. Motion: fade-in 400ms ease-out per section, once. Copy: [tone], no filler. Never: gradients on white, emoji in headings, more than one accent color, drop shadows.

Every site in our design library ships with this exact structure pre-filled from measured values — colors, fonts and spacing extracted from the live site.

Frequently asked questions

How long should a Lovable prompt be?

The founding prompt: 200–400 words. Follow-ups: 5–25 words with a single change each. Both extremes — one-liners and 1000-word mega-prompts — produce worse results.

Should I tell Lovable which components or libraries to use?

Usually no. Describe the outcome and constraints; let Lovable choose implementation. The exception is when you need consistency with an existing codebase.

How do I stop Lovable from redesigning things I liked?

Anchor explicitly: "Keep everything else exactly as is. Change only X." Without an anchor, regeneration can drift areas you never mentioned.

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