#state diagram

Mermaid NG — Visual Editor

NGPowerToys

WYSIWYG, drag-and-drop visual editor for AI-friendly Mermaid diagrams — what you see is what you get. For architects and developers — build, edit, and round-trip flowcharts, sequence, class, ER, and state diagrams across .md and .mmd files. Multi-sheet (draw.io style), fully offline (Mermaid 11.15.0

Mermaid Preview — 100% Offline

brainfkt

Offline-first Mermaid diagram preview for VS Code—with professional export, no account, and no required network connection.

VS UML Modeling

YoavFrandzel

UML class, sequence, and state diagram modeling with a shared workspace model.

Fizzim FSM Editor

CaioPlazas

Draw finite state machines and generate synthesizable Verilog/VHDL — a native VS Code editor for Fizzim (.fzm) diagrams.