Simulate traffic and chaos on your diagram —
not just static boxes and arrows.
System design simulator in your browser — traffic, chaos, and AWS cost signals on the canvas.
Rust → WASM discrete-event engine · 57 blueprints · 28 chaos scenarios · no signup
Why not just a whiteboard? Compare to diagram tools →
What's Inside
Map services on an infinite canvas for system design interviews and team reviews: drag-and-drop components, bezier wires, multi-select, undo/redo, zoom, and auto layout with optional layout zones for custom columns.
Discrete-event simulation (DES) in WebAssembly drives request flow through your diagram at configurable RPS — a living architecture simulator, not a static sketch.
Practice resilience testing: node crashes, partitions, memory pressure, and MCP-only chaos scenarios on AI agent blueprints.
Rough-order AWS pricing mapped to your boxes — EC2, Lambda, RDS, ElastiCache, and more — so cost tradeoffs stay visible while you iterate.
While the sim runs: a top status bar (RPS, p99, errors, bottlenecks), readouts on nodes, and toolbar Metrics opens a full-page System metrics analysis view with latency history and bottleneck callouts—built for interview and SRE-style narratives.
Start from real patterns — e-commerce, chat, serverless APIs, IoT, exchanges, ML pipelines, MCP agents — then stress-test with simulation and chaos.
Copy share link creates a short URL—your diagram is stored server-side with a 7-day expiry so big designs share cleanly. For something permanent, use export JSON or PNG.
No login. No credit card. No nonsense.
Just you, a canvas, and infinite possibilities.
Or don't. We'll be here. Waiting. Patiently. █
Built By
Two contributors. One context window.
No standups. No Jira. No regrets.