I built an AI landing page roaster in a weekend using Claude API + Netlify Functions

Lorenc — Fri, 27 Feb 2026 16:40:10 +0000

Every time I shared a landing page for feedback, I got the same useless responses:

"Your headline could be clearer"
"Add more social proof"
"The CTA isn't strong enough"

Great. But which headline? What kind of social proof? How do I fix the CTA?

Vague feedback doesn't convert visitors into customers. Specific feedback does.

PageRoast — an AI tool that scores your landing page across 6 conversion dimensions and gives you the exact fix for each one.

You paste your URL and page copy, and you get back:

An overall conversion score (0–100)
A breakdown across 6 dimensions: Clarity, ICP Fit, Pain/Outcome Framing, CTA Strength, Social Proof, Objection Handling
The specific problem on your page for each dimension (quoting your actual copy)
A concrete rewrite or fix for each issue
Your single biggest conversion killer

The Stack:

Frontend: Vanilla HTML/CSS/JS (keeping it simple)
AI: Claude API (claude-haiku for speed)
Backend: Netlify Functions (serverless, zero config)
Email capture: Airtable via a Netlify Function
Hosting: Netlify

The whole thing took a weekend to build and costs less than $0.01 per analysis to run.

The Interesting Part — The Prompt

The hardest part wasn't the code, it was the prompt. Generic AI feedback is just as useless as human feedback. The key was building a structured rubric that forces the model to:

Quote the actual copy when identifying a problem
Give a concrete rewrite, not just "improve this"
Return consistent JSON so the UI can display it cleanly

Try It

It's completely free. No credit card, no account needed upfront.

👉 https://wondrous-dusk-6a0da2.netlify.app/

Would love feedback from this community — especially on the prompt or the tech stack. What would you have done differently?

DEV Community: Lorenc

I built an AI landing page roaster in a weekend using Claude API + Netlify Functions

The Interesting Part — The Prompt

Try It