MarkUp.

MarkUp

MarkUp transforms how you communicate web changes to AI agents. Draw directly on live websites to create precise, structured briefs that eliminate ambiguity and accelerate development workflows.

Product Highlights

• Visual Annotation: Seven drawing tools overlay any live webpage — no screenshots, no Figma, no context switching
• AI-Ready Export: One-click generates PNG + markdown changelog with CSS selectors for instant AI briefing
• Zero Friction Setup: No accounts, no cloud sync, no backend — works entirely offline in your browser
• Precise Targeting: Every annotation captures exact CSS selectors so AI agents know exactly which element to modify
• Universal Compatibility: Exports work with Claude, ChatGPT, Copilot, Claude Code, Cursor, and any AI accepting files

Use Cases

• Web Development: Brief AI agents on precise UI changes with visual context and technical selectors
• Client Feedback: Convert vague client notes into structured, numbered briefs developers can execute immediately
• Design Handoff: Replace lengthy written specifications with annotated screenshots and auto-generated changelogs
• Agency Workflows: Streamline review-to-build cycles by feeding visual feedback directly into AI coding agents

Target Audience

MarkUp serves web developers, designers, and agencies who use AI coding assistants like Claude Code or Cursor and need to communicate visual changes with precision and speed. Ideal for professionals tired of writing paragraphs to describe pixel-level adjustments.