System Design Simulator
Drag components from the palette or load a template
Click ports to draw connections between components
What This Tool Does
System Design Simulator is built for deterministic developer and agent workflows.
Visual drag-and-drop system architecture builder with components, connections, templates, and export.
Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.
Last updated:
This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.
Agent Invocation
Best Path For Builders
Browser workflow
Runs instantly in the browser with private local processing and copy/export-ready output.
Browser Workflow
This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.
/system-design-simulator/
For automation planning, fetch the canonical contract at /api/tool/system-design-simulator.json.
How to Use System Design Simulator
- 1
Drag-and-drop architecture components onto canvas
Start with blank canvas. Drag servers, databases, caches, load balancers, message queues onto the board. Position them logically (front → app → cache → db). Visual system design.
- 2
Connect components with arrows to show data flow
Draw arrows: Client → Load Balancer → App Server → Cache → Database. Label arrows with protocols (HTTP, gRPC, SQL). Visualize request flow through your system.
- 3
Add annotations for capacity, latency, and throughput
Label server nodes with specs (4CPU, 16GB RAM), database with throughput (10k req/s), cache hit rate (95%). Add latency estimates. See where bottlenecks are: slow DB? Low cache hit?
- 4
Test scaling: what happens if load doubles?
Original design: 2 app servers, 1 database. If traffic doubles, bottleneck shifts: app servers fine, but DB maxes out. Drag in another DB replica or add read replicas. Simulate scaling strategy.
- 5
Export and document system design for team
After designing, export canvas as image or PDF. Share with team. Much clearer than 'we have a load balancer and three app servers.' Visual documentation for onboarding and discussions.