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Turning real site CSS into AI build prompts

Build a developer tool that extracts real CSS and design tokens from any live website and converts them into structured prompts or design specs for AI coding assistants like Claude, Cursor or v0, aimed at indie developers tired of generic 'AI slop' UI output. A paid version could add Figma export, Tailwind config generation, multi-page batch inspection, or team-shared design libraries, monetizing a problem the free pikspec extension only partially solves.

via Reddit
Original post

What to build

A browser extension for solo devs that inspects any live website, extracts its real CSS/design tokens, and outputs structured specs AI coding assistants (Claude, Cursor, v0) can use to rebuild UI accurately. Paid tier adds Figma export, Tailwind config generation, multi-page batch scraping, and team design libraries.

A free extension (pikspec) already proves developers want real CSS fed into AI coding assistants to kill 'AI slop' UI — the opening is a paid layer with export, batch inspection, and team features the free tool skips.

Demand

Solo developers and vibe-coders building with Claude/Cursor/v0 want AI-generated UIs to match real-world design instead of generic defaults, and are already sharing workarounds for it in no-code communities.

  • r/nocodeCommunity

    Post demoing pikspec rebuilding Spotify's pricing section via extracted CSS fed to Claude, framed as fixing 'AI slop' websites.

Stack

  • Chrome Extension Manifest V3
  • CSS Object Model / getComputedStyle API
  • Claude API
  • Figma Plugin API
  • Tailwind CSS config generator
  • Supabase

Solo + AI difficulty

MVP (single-site CSS extraction plus prompt formatting) is a weekend build with Claude's help since it's mostly DOM/CSSOM scraping; the hard parts are multi-page batch crawling, clean Figma export, and reliably mapping arbitrary CSS to Tailwind tokens. Time-to-MVP: roughly 1-2 weeks.

Entry threshold
Low barrier: a Chrome extension with a DOM/CSS inspector and prompt templating layer can be built solo with AI in one to two weeks; a free competitor already exists, so differentiation has to come from paid features, broader framework export, or tighter AI tool integrations.
Window
3-6 months

Where to find first users

  • r/nocode
  • r/SideProject
  • Product Hunt launch
  • indie hacker / vibe-coding Discord communities

Competitors

Counter-signals & risks

  • AI coding assistants like Claude, Cursor, and v0 may soon natively support live DOM/CSS inspection, removing the need for a standalone extension.

  • Design token extraction already exists via browser devtools and Figma plugins, so differentiation is limited.

  • The core extraction utility is already free via pikspec and native devtools, making it hard to justify a paid tier without strong added value.

Original title: I made an extension that inspects any site and gives Claude the real CSS. Here it is rebuilding Spotify pricing section | No more AI slop websites

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Turning real site CSS into AI build prompts — Nichr