Mermaid and PlantUML are everywhere now — Cursor pastes them, Notion renders them, every engineer’s README has at least one. The problem: defaults look like a 2008 Visio export, and dropping that into a board deck makes the whole doc feel cheap. Beauty Diagram is the polish layer engineers and PMs kept hoping someone would build.
What it actually is
A Mermaid/PlantUML beautifier with curated themes, animated flow export, and three ways to use it: a web editor for quick edits, a bd CLI for README and docs workflows, and an HTTP API for CI pipelines. Output is SVG, PNG, or GIF. Free tier exists; paid plans cover teams and higher limits. Built by solo dev Levi.
Why this is the moment
AI agents already spit out Mermaid by default — it’s the lingua franca for “draw me an architecture diagram.” But every coding agent stops at the code. Beauty Diagram closes the loop: same prompt, same Mermaid, but the output is something you’d paste into an exec deck without flinching. Day one on Product Hunt: 91 upvotes, day rank #10. The roadmap calls out a SKILL framework for agent integration — the obvious play is letting Cursor or Claude Code call the API so the polish step just happens.
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