Zero Docker Desktop Required • Safe In-Browser Simulation Engine
Master Docker by actually building it.
An interactive, visual playground where you run real container commands, bridge virtual networks, build layer stacks, orchestrate Compose services, and solve break-fix challenges — right in your browser.
0ms Instant SimulationDeterministic parser executes and visualizes commands in milliseconds.
Visual Mental ModelsLive topology, DNS lookup traces, and build cache status make invisible concepts visible.
Break/Fix LabDiagnose and repair crash loops, port collisions, and network split bugs with guided clues.
Built to Make Studying Addictive & Clear
From single-container commands to full-stack Docker Compose and Kubernetes architectural bridges.
Live Terminal & Auto-Explainer
Step-by-step "What Just Happened?" explanation and beginner mode flag breakdown.
Network Flow & DNS Tracer
Send animated HTTP packets across bridge networks and learn why localhost fails.
Compose 3-Tier Studio
Live editable YAML, service dependency graph, and 1-click multi-container orchestration.
Dockerfile Image Builder
Multi-stage build studio, layer cache simulator, and image slimming optimizer.