Architecture Lab: interactive system design practice

Design a URL shortener, group chat, news feed, API rate limiter, nearby-driver service, video streaming pipeline, flash-sale inventory system, or device telemetry platform. Connect components and inspect modeled request paths, throughput, cache hits, async flow, logical storage and latency. The free simulator runs in your browser; JavaScript is required to use the canvas.

Scores are teaching feedback, not production benchmarks or measured p95. You can export JSON architecture code and share a link. No account is needed.