MarkUp
markupextension.comDraw what you want changed. Let AI build it.
AI Toolschrome-extensionai-promptingweb-annotationdeveloper-toolsclaudecss-selectorsfeedback
About
MarkUp is a free Chrome extension that lets users annotate live webpages directly in the browser, auto-numbering callouts and generating a structured markdown changelog with CSS selectors. Users can export a PNG screenshot plus the markdown brief to paste into any AI assistant—such as Claude, ChatGPT, or Copilot—or save it to a local folder for agent workflows. It requires no account, no cloud sync, and stores all data locally in the browser extension storage.
Problem
Describing UI changes to AI assistants in plain text is slow, ambiguous, and wastes context tokens.
For
Web developers and agencies who use AI coding assistants to make frontend changes
How it works
Users annotate a live webpage with numbered callouts and labels using the extension, then export a PNG screenshot plus a markdown changelog (with CSS selectors) to paste directly into an AI assistant or save to a watched project folder.
Business model
freemium
Status
waitlist
Company
Implement AI