AI-assisted system architecture diagramming tool. Describe a system in plain English and get a professional React Flow diagram with auto-layout, subgraph grouping, and export.
- AI Generation — Natural language → 6-stage pipeline → styled diagram (concept detection, LLM planning, Mermaid materialize, layout, score, validate)
- Repo → Diagram — GitHub URL / tarball → 10-stage pipeline → architecture from code (ingest, analyze, classify, extract, relationships, verify)
- Interactive Canvas — Drag, pan, zoom, group, connect with floating-edge + collision-aware routing
- Multi-Canvas Tabs — Zustand-backed tab management with undo/redo + debounced persistence
- Mermaid — Input / export raw Mermaid with auto-validation and round-trip via
layoutDiagramViaMermaid - Auto-Layout — Dagre-only via Mermaid pipeline (
pipeline-shared/layout); LR / TB toggle in toolbar - Templates — Pre-built architectures (Netflix, Uber, Instagram, etc.)
- Tutorials — 22+ guided tutorials teaching system architecture
- Auth — better-auth (Google / GitHub OAuth — email+password disabled) with 7-day sessions
- Persistence — Prisma + Supabase / Neon (PostgreSQL) + guest localStorage fallback
- Share & Embed — Public share links and embeddable viewers (domain allowlist via
ALLOWED_EMBED_DOMAINS) - MCP Server — Standalone protocol server for AI assistants (generate, update, validate, layout, template, export)
- Export — JSON, Mermaid, PNG, SVG (SVG/PDF gated for authenticated users)
Next.js 16 / React 19 / TypeScript · React Flow v11 · Zustand v5 · Dagre (layout for the app and MCP server) · Groq · Prisma + Supabase · Upstash Redis · Tailwind CSS v4 · Framer Motion · Radix UI / shadcn/ui · Mermaid.js v11 · better-auth
- Node.js 18+, npm 10+
- Groq API key (for AI generation)
- PostgreSQL database (optional — auth & persistence, e.g. Supabase)
- Upstash Redis (optional — caching)
cd frontend
npm install
cd ../mcp-server && npm install && cd ../frontend
cp .env.example .env.local
# Edit frontend/.env.local with your actual valuesGROQ_API_KEY=your_groq_api_key
DATABASE_URL=postgresql://...
UPSTASH_REDIS_REST_URL=your_redis_url
UPSTASH_REDIS_REST_TOKEN=your_redis_token
BETTER_AUTH_SECRET=your_secret
BETTER_AUTH_URL=http://localhost:3000
# Admin Configuration (Optional)
ADMIN_PASSCODE=your_admin_passcode
ADMIN_SESSION_SECRET=your_admin_session_secret
ALLOWED_ADMIN_EMAIL=admin@yourdomain.com
# Public Configuration
NEXT_PUBLIC_ADMIN_EMAIL=admin@yourdomain.com
NEXT_PUBLIC_CONTACT_EMAIL=contact@yourdomain.com
# Embed Security (Optional)
ALLOWED_EMBED_DOMAINS=example.com,another.comOnly GROQ_API_KEY is required for AI generation. The app runs locally without Redis (rate limiting degrades gracefully).
See frontend/.env.example for a complete list of available environment variables.
For security configuration and best practices, see SECURITY.md.
All commands should be run from the frontend/ directory.
# Start Next.js dev server
npm run dev
# MCP server (in a separate terminal)
npm run dev:mcp
# Tests
npm test
# Lint & type check
npm run lint
npx tsc --noEmit
# Production build
npm run build
npm run startArchDraw/
├── frontend/ # Next.js app — the product (see frontend/lib/README.md, frontend/components/README.md)
│ ├── app/ # Routes and API route handlers (App Router)
│ ├── components/ # UI by area: canvas/, editor/, viewers/, landing/, dashboard/, tutorial/, ui/ …
│ ├── lib/ # Logic by domain: diagram/, ai/, repo-diagram/, server/, client/, theme/, icons/ …
│ ├── store/ # Zustand stores (diagram store is split into store/diagram/slices)
│ ├── hooks/ # Shared React hooks
│ ├── data/ # Templates, tutorials, component catalog (JSON/TS data)
│ ├── prisma/ # Database schema + migrations
│ └── scripts/ # Eval, perf, and maintenance scripts
├── mcp-server/ # MCP server published as @hiabhee/archdraw-mcp-server
├── plugins/archdraw/ # Claude Code + Codex plugin (skill + MCP config)
├── docs/ # Architecture notes, guides, plans (start at docs/README.md)
├── .claude-plugin/ # Claude Code marketplace manifest ┐ fixed locations the
└── .agents/plugins/ # Codex marketplace manifest ┘ agents look for
New here? Read CONTRIBUTING.md first.
6-stage pipeline in lib/ai/pipeline/mermaid-pipeline/createAiMermaidStages.ts: Concept Detection → Architecture Planning (LLM or canned conceptTemplates.ts for ≤12-word prompts) → Layout Override → Mermaid Materialize (parse → build → Dagre layout → size) → Score → Validate. Canonical relayout is layoutDiagramViaMermaid in lib/diagram/mermaid/relayout.ts (React Flow → Mermaid → Dagre → React Flow).
Repo pipeline in lib/repo-diagram/pipeline-v2.ts: Ingest → Cache Check → Analysis → Baseline → Classify → Extract → Relationships → Verify → Finalization → Cache Write.
Standalone server at mcp-server/ (self-contained node_modules), published to npm as @hiabhee/archdraw-mcp-server. Dev: npm run dev:mcp from frontend/. Tools: generate_diagram (Mermaid-first), update_diagram, validate_diagram, fix_layout, apply_template, list_templates, list_node_types, get_diagram_state, export_diagram, save_checkpoint, load_checkpoint, read_me. Layout runs through the web app's Mermaid → Dagre pipeline; diagrams come back with a preview link by default. Install it as a plugin from plugins/archdraw/.
MIT