#sequence 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.
PlantUML Local
kkdev92
Render ```plantuml code blocks in the built-in Markdown preview. No Java, no server, no network connection — your diagram source is rendered locally.
VS UML Modeling
YoavFrandzel
UML class, sequence, and state diagram modeling with a shared workspace model.
annotron — Markdown preview, Mermaid diagrams & point-and-click review
hueanmy
Preview Markdown & HTML with Mermaid diagrams (flowchart, sequence, class, ER, C4, gantt), outline navigation, and point-and-click review. A human-in-the-loop layer for AI coding agents (Claude Code, Cursor): comment on any element or text, auto-apply feedback via the integrated agent loop, sync edi
CodeMap Trace
gns333
Sequence diagrams and spatial code traces for .codemap JSON files. 可视化服务时序图与源码 Trace。
DrawIt for VS Code
ChamukaLabs
Create and edit DrawIt diagrams with AI generation — directly in VS Code.
MR Behavior Lens
sinjmenaruchi
Review GitLab merge requests as before/after behavior sequence diagrams
Advanced Mermaid: Visual Diff
AkshayDMuley
Visual diff for Mermaid diagrams — compare the rendered picture across any git ref, or merge both versions into one marked-up diagram.
GlitchLens
Glitch-Sound
Instantly visualize TypeScript and JavaScript function flow as Mermaid sequence diagrams.
Forward
forward
Annotate a shared design canvas from VS Code — document any API (any language/framework), draw infrastructure & sequence-flow diagrams, track tasks, and browse endpoint history. Synced to your team through the Forward server — or automate it from CI via @adc anchors and the Forward MCP server.