leaf – one month later: website, releases and lots of improvements
Mermaid diagrams and LaTeX math rendered as ASCII in your terminal.

Yet another Mermaid editor when mermaid.live already does this free with more features.
Developers and technical writers creating Mermaid diagrams
mermaid.live · Mermaid Chart · Kroki
Mermaid diagrams and LaTeX math rendered as ASCII in your terminal.
It wires Mermaid into the MCP ecosystem so an assistant can spit out diagram source and immediately open a live browser preview over WebSocket, with instant re-renders and SVG/PNG download. That glue — CLI + MCP server + live preview — is a small idea but a high-utility one for anyone iterating diagrams with LLMs; it doesn't reinvent Mermaid, it makes AI-driven diagram authoring actually usable.
Native macOS feel without Electron bloat; offline LaTeX and Mermaid support.
Lazy-loaded grammars only hit the wire when you open a fence.
Tufte CSS live editor with zero dependencies—but local-only and AI-generated code limits trust.
Lazy-loading CodeMirror grammars is clever, but Obsidian already does inline preview better.