Best vibecoding tips: improve your AI generated website

TL;DR

• Paste a Design System Pack into Lovable, Cursor, or Claude Code and your site stops looking AI generated in about 30 minutes. Your copy stays verbatim.
• Twelve concrete improvements you can ship today: prompt structure, copy hygiene, design constraints, performance, and the social proof your testimonials section is faking.
• Most of these take 15 to 60 minutes each. The pack just collapses the design ones into one paste.

You shipped it. Now make it not look AI generated.

Lovable, Cursor, Claude Code, Bolt, v0, and Replit have made it possible for non-engineers to ship working products. The bar to launch is the lowest it's ever been. The bar to look like a real product is now harder than it used to be, because every shipped site has the same training-data fingerprints.

The good news: the fix is mostly mechanical. Below are 12 specific things you can do to your existing AI generated site that move it from "obvious" to "considered." Most are 15 to 60 minutes of work. None require a redesign from scratch.

1. Write your prompts in four sections, not one paragraph

The default mode is to ask the AI for a landing page in one sentence. That gives you the model's average output. Replace it with a structured prompt:

GOAL: One sentence describing the page's job (sign up for trial, book demo, etc.)
AUDIENCE: Who's reading. Their job, their pain, their alternatives.
TONE: Three reference brands. Where you sit between them.
CONSTRAINTS: Specific design rules. Specific copy that must not change.

The four-section prompt forces you to specify what's actually constrained. Without it, the model fills the gaps with its training average, which is exactly what you don't want. Vibecoders who ship the best-looking sites all do some version of this. Vibecoders who don't, get the average.

2. Write your copy first. Drop it into the AI as fixed input.

Copy is the asset. Headlines, subheads, button text. Those are what convert. The design is the wrapper. AI tools default to writing both, which means they write the design well-ish and the copy generically.

Write the copy yourself first. Drop it into the AI in a "DO NOT MODIFY" block. Make the AI build the design around the copy.

Most AI generated sites have great-looking design wrapped around copy that sounds like every other AI generated site. Reverse it. Write the copy yourself, let the AI handle the wrapping.

3. Set a design system, not a list of preferences

"Make it modern and clean" is not a design system. It's an aesthetic vibe that the model interprets as the corpus average (purple gradient, Inter 700, three feature cards).

A design system is six concrete rules:

• One typeface for display, weight 500 max
• One typeface for body, weight 400
• Three accent colors, three appearances each
• Solid backgrounds with single radial accents, no multi-stop gradients
• 160px minimum vertical section padding
• Buttons are white-on-dark or dark-on-white, no gradient buttons, no icon-with-arrow

Drop those rules at the top of every prompt. The output stops looking like training-data average within one regenerate.

4. Ship section by section, not full pages

Asking the AI for a whole landing page in one shot exceeds its reliable instruction-following window. Constraints at the top of the prompt have full force on the first section it generates and reduced force by the footer.

Ship the navbar. Review it. Then the hero. Review it. Then the features. Review each.

This is slower in clock time but faster in calendar time, because you don't have to undo and redo a whole-page generation that drifted in the last third. The same logic applies to feature work after launch: one section per prompt, review before moving on.

5. Keep an "exhibits" doc with reference URLs

Open a Notion page or a shared text file. Paste 5 to 10 URLs of sites you want yours to feel like, with one-line annotations describing what each does well.

- Linear.app: typography hierarchy, asymmetric hero
- Stripe.com: section transitions, color restraint
- Vercel.com: spacing rhythm
- Geist.fyi: font pairing, weight 500 display

When you prompt the AI, paste the exhibits doc. Models can't fetch the URLs reliably, but they can use the names + your annotations as guardrails. The model will recognize "Linear-style typography" and constrain its output toward that reference.

6. Deploy to a real URL on day one

Lovable previews lie. The animation looks smoother in the preview iframe than on a real phone over 4G. The colors look richer on your laptop than on a non-color-managed Android. The hero text wraps differently when the system font fallback kicks in before the web font loads.

Deploy to Vercel, Netlify, or Cloudflare Pages on day one. Test on a real phone, on real cellular, on a different OS than yours. Most of the bugs in AI generated sites only appear in real-world conditions, and the longer you wait to deploy, the more of them stack up at once.

7. Set a performance budget

Pick a target before you ship. The cheap one:

• Mobile Lighthouse Performance score: 70+ (90+ if you're being thorough)
• Largest Contentful Paint: under 2.5 seconds
• Cumulative Layout Shift: under 0.1
• Total Blocking Time: under 200ms

Run Lighthouse against your live URL after every meaningful change. If you breach the budget, fix it before adding more features. AI tools have no idea what your bundle size is, what fonts you're loading, or what your hero image weighs, until you measure. The first measurement is usually a bad surprise; that's the point.

8. Replace stock testimonials with your own customers' words

DiceBear avatars and "Sarah from Acme Corp said this product is amazing" are the most visible AI tells outside the design itself.

If you have real users, ask three of them for a one-sentence quote you can use. Get their permission to use a real name and either a real photo or initials in a colored circle. Paste those into your testimonials section.

If you don't have real users yet: remove the testimonials section entirely. An empty space is better than a fake one. Visitors recognize fake testimonials in 100ms, and the moment they do, the rest of your claims also become suspect.

9. Strip the AI-default font stack

Inter at weight 700 is a tell. The shadcn default is a tell. The Vercel sans is a tell.

Replace with:

• Geist (free, similar geometry to Inter, slightly more presence)
• General Sans (free at certain weights, more character)
• Manrope (free, neutral but distinct)
• Fraunces for display, paired with Inter weight 500 for body

Anything except Inter weight 700 instantly differentiates the site from 80% of AI generated competitors. The font swap is a 5-minute change in any AI tool: tell it to replace the display font and re-render. Don't argue with it; if it pushes back, paste the family name with the weight you want.

10. Drop one section, not add one

The instinct when something feels off is to add. Another testimonial. Another feature. Another social proof block. The fix is usually to subtract.

Pick one section and delete it. Look at the page. Most landing pages have 8 to 10 sections; cutting to 6 or 7 reads as more confident, not less. If the page reads worse without it, put it back. Most of the time it doesn't.

The corollary: when adding a section feels necessary, write the headline first. If the headline is generic ("Why teams love us"), the section is filler. Cut it.

11. Replace gradient buttons with solid ones

Gradient buttons are a 2022 trend that AI tools haven't gotten the memo on. White button on dark background. Dark button on light background. That's it. Maybe a subtle inner shadow. No gradient. No icon-with-arrow. No "Get started for free" with a sparkles emoji.

The button should be a button, not an event.

This is a 30-second change: tell the AI to replace every button background with a solid color, drop any gradient classes, and remove decorative icons unless they communicate something specific (a download icon for a file download, an external-link icon for offsite links).

12. Show the site to one person outside the AI bubble

Find someone, a friend, a family member, a colleague in a non-tech role, who doesn't follow vibecoding Twitter. Show them the site for 30 seconds. Ask:

• "What does this product do?"
• "Who's it for?"
• "Would you click anything?"

If they can't answer the first two in plain words, your copy is too vague. If the answer to the third is "I don't know what to click," your visual hierarchy is wrong.

Outsider feedback is the cheapest, fastest debugging tool you have. AI tools optimize for "looks plausible to other AIs," which is not the same as "communicates to humans." (For more on why this is structural, see why every vibecoded site looks the same.)

Pack

Most of the tips above take 15 to 60 minutes each. The Design System Pack collapses tips 3, 4, 9, and 11 (design system, section-by-section, font swap, button style) into one paste. Drop it into Lovable, Cursor, or Claude Code, paste the renovate prompt, and the design fixes happen in about 30 minutes while every word of your copy stays. The other tips (copy, performance, testimonials, outsider feedback) are still on you. $19 one-time, 14-day refund.