Sketchdown – Wireframes as code, like Mermaid but for UI mockups
Mermaid for wireframes, but relies on AI to close the last mile.

URL-to-mockup in real time, but Figma/Framer already own the space.
Design agencies, freelance developers, product teams needing rapid prototypes
Figma · Framer · Relume
Mermaid for wireframes, but relies on AI to close the last mile.
Sitemap-first design workflow, but Figma, Miro, and Whimsical already own this space entirely.
Synthetic user testing on generated flows before engineering builds anything.
Official Balsamiq MCP server turns wireframes into LLM context for code generation.
Deep Randomize swaps graph topologies from 20 layouts for infinite procedural wireframe variations.
ASCII rendering cuts tokens dramatically, but browser automation and LLM observation are well-trodden ground.