RedLinz is a browser-based visual markup tool for human-to-AI handoffs, simplifying UI tweaks. Instead of text descriptions or raw screenshots, directly mark up images with 12 standardized symbols. It exports structured prompts with exact coordinates and labels, so AI agents precisely understand your intent. Compatible with Cursor, Claude Code, ChatGPT, and more. All annotation is client-side, keeping images private. Free for 5 markups/month; Pro ($8/mo) for unlimited, watermark-free exports.