Make your AI build sites that turn visitors into customers.
Your AI codes well but designs generic — ghost buttons, forced sign-ups, bloated forms. Those exact mistakes cost sales. GoodAiUX is one file your AI reads before it designs, so it applies the fixes that independent studies found can lift conversions by up to 35% — instead of guessing. See the research →
Your AI is great at code. It's mediocre at conversion.
Models are trained on Dribbble and Tailwind demos. They default to whatever looks "modern" — ghost buttons, hidden filters, hamburger menus on desktop, "Submit" CTAs. Every one of those choices has lost an A/B test.
✕ AI without GoodAiUX
- ✕ Ghost / outlined primary CTA (low-contrast loses clicks)
- ✕ Hamburger menu on desktop (hidden nav = forgotten nav)
- ✕ Two-column form with required-field asterisks
- ✕ "Submit" / "Continue" button labels (no benefit, no click)
- ✕ One CTA at the top, none at the bottom of the page
- ✕ Vague "Fast shipping" copy with no concrete date
- ✕ Stock photos, no testimonials, no trust seals
✓ AI with DESIGN.md
- ✓ Filled, high-contrast CTA with benefit-led label ("Get my report")
- ✓ Visible nav, visible search, persistent filters as chips
- ✓ Single-column form, top labels, optional marked
- ✓ Sticky mobile CTA on every product/cart screen
- ✓ Repeated CTA + trust seals at page bottom
- ✓ Specific delivery date: "Arrives Thursday"
- ✓ Stacked social proof: reviews, ratings, logos, video
Three steps. About 60 seconds. Forever.
No SaaS, no login, no Figma plugin. Just one Markdown file your AI reads alongside your prompt. Want to try before paying? Start with the free Lite edition →
Buy & download DESIGN.md
One-time $5 via Stripe. The file lands in your inbox — yours to keep, no expiry, no login. Or grab the free Lite edition first.
+ free AI Week Radar weekly digest (confirm separately)
Drop it next to your project
Put DESIGN.md in your repo root, your Claude Project, your Cursor rules, or paste it into the system prompt. Your AI finds it automatically.
├─ DESIGN.md ← here
├─ src/
└─ package.json
Build like usual — get conversion by default
Every screen your AI generates now follows the GoodAiUX rules: filled CTAs, sticky mobile bar, top-aligned labels, visible prices, repeated CTA at footer.
AI: Three tiers (cap at 3),
middle preselected,
testimonials below…
The mistakes that quietly cost you customers
Each card is a default your AI gets wrong, the fix this file applies, and what independent studies measured when teams made that fix. Plain language — the academic citations live on the research page.
Forcing people to create an account before buying. Guest checkout instead.
Hiding shipping & fees until the last step — the #1 reason carts get dumped.
Long forms with required-everything. Short, single-column, labels on top.
Shipping a heavy page. Speed isn't a tech detail — it's a sales lever.
Two equally-loud buttons. One filled, high-contrast call-to-action wins.
No reviews (or fake ones). Real ratings with a count multiply sales.
Buttons out of thumb reach. ~Half of visitors hold the phone one-handed.
Ten pricing tiers. Too many options freezes buyers — cap it at 3–4.
Slow load. Going from 1s to 3s makes a third of mobile visitors leave.
Inaccessible UI. 95% of sites fail it — losing buyers and inviting lawsuits.
Auto-rotating hero sliders. Almost nobody clicks past the first slide.
Vague promises. "Arrives Thursday" outsells "ships in 2–3 days".
Every number here is from an independent study — not us. See all the sources and the methodology →
Why a Markdown file beats a Figma kit or a course
| $200 Figma kits | $500 CRO courses | Generic AI prompt | GoodAiUX — $5 | |
|---|---|---|---|---|
| Your AI actually uses it | ✕ | ✕ | ~ | ✓ Native .md format |
| Every claim backed by a real study | ✕ | Some | ✕ | ✓ All sourced at /research |
| Works for everyone (accessible by default) | Partial | Sometimes | ✕ | ✓ Verified, not asserted |
| Free version to try first | ✕ | Sometimes | ✓ | ✓ Free Lite edition |
| No subscription or lock-in | ~ | ~ | ✓ | ✓ One file you keep |
| Works across Claude, Cursor, v0, GPT | ✕ | ✕ | ✓ | ✓ |
| Time to first shipped screen | ~ days | ~ weeks | ~ hours | ✓ ~ 60 seconds |
| Price | $199–499 one-time | $299–999 one-time | $0 (but generic) | $5 one-time |
One file. Five dollars. Yours to keep.
- DESIGN.md (~68 KB) — drop-in for Claude / Cursor / v0 / GPT / Windsurf
- The Ten Principles + the full conversion / forms / feedback / trust rule set
- A brand-agnostic color contract (WCAG by construction) + 30+ component specs
- Every figure traceable to an independent study — full list at /research
- Tuned so AI tools actually apply it, not just read it
- One file you keep — no login, no SaaS, no expiry
The proof is the research — not testimonials.
GoodAiUX is new, so we don't fake reviews, ratings or customer logos. Instead, every number we quote is someone else's published study — and you can open every one.
Every number is checkable. The conversion figures on this page come from independent research — Baymard, Google/Deloitte, Northwestern, and more. We list and link all of it on the research page, so you trust the data, not us.
It works for everyone. Colour is shipped as a contract — every role is locked to a WCAG contrast target, so the palette your AI builds passes the audit by construction, for any brand. People with low vision can actually use it — which also means more customers and less legal risk.
Try before you pay. The free Lite edition is a real working subset — ship one screen with it, see the difference, then decide if the full file is worth $5. One file, no lock-in, no subscription.
Everything you'd want to know before clicking buy
What exactly do I get for $5?
One file, DESIGN.md — 792 lines, ~68 KB. The top of the file holds the design tokens (a brand-agnostic colour contract — semantic roles locked to WCAG contrast targets, no baked-in hex — plus typography, spacing, and 30+ components). The body is the Ten Principles plus the full rule set for checkout, forms, feedback, trust, mobile and accessibility — written so an AI tool actually applies it.
You also get the free Lite edition to try first, and the research page where every number is sourced. One-time $5, no subscription — download it, drop it into your AI tool, done.
How do I actually use it with my AI?
Three options:
1. Drop it in your repo root. Claude Code, Cursor, Aider, and Copilot will read it automatically when you ask for UI work.
2. Paste it as a Claude Project or ChatGPT custom instruction.
3. Reference it in your v0 / Bolt prompt: "Follow the rules in this file: [paste contents]."
Where do the numbers come from? Can I check them?
Yes — that's the whole point. Every figure ("+45% completed sales", "47% of abandons", and the rest) is from independent research: Baymard Institute, Google/Deloitte, Northwestern's Spiegel Research Center, Nielsen Norman Group, WebAIM, the W3C, and others.
We moved the full reference list out of the file (so it stays lean for AI tools) and onto a dedicated research page — grouped by topic, every source linked, so you can open the original and check it yourself. We don't ask you to trust us; we ask you to trust the studies.
Is there a free version?
Yes. The free Lite edition (DESIGN-lite.md) is a real working subset — the core tokens, the Ten Principles, and the ~20 highest-leverage rules. We email it to you and add you to AI Week Radar (free weekly AI digest, double opt-in — you can ignore the confirm email if you only want the file).
Use it on a real screen. If it changes how your AI designs (it will), the full file adds the complete color contract, all 30+ component specs, and the full rule set for $5 one-time.
Does it work for SaaS, e-commerce, mobile, dashboards?
Yes for all four. The rules cover e-commerce (sticky buy button, honest pricing, delivery dates, friction-free checkout), SaaS & landing pages (a capped, clear plan list, one strong call-to-action, proof placed where doubt happens), signup flows (guest-first, short steps, progress shown), and mobile (big tap targets, buttons in thumb reach). Your AI picks the right rules for the page it's building.
Why $5? What's the catch?
No catch. At $5 it's an obvious yes for anyone building with AI, and we'd rather have ten thousand customers giving us feedback than a hundred paying $500. Price may rise as the file matures.
Try it free. Or keep shipping the same generic AI page that doesn't sell.
Start with the free Lite edition — no email. The full file applies the fixes research found can lift conversions by up to 35%, every number sourced. One Markdown file, $5 one-time when you upgrade.