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KURAUDOU

A hands-on cloud architecture simulator. Build, send, and watch requests flow through your AWS designs.

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Features

16 AWS services

USER / Route 53 / CloudFront / WAF / API Gateway / ELB / EC2 / Lambda / Auto Scaling Group / RDS / S3 / ElastiCache / SQS / SNS / NAT Gateway / Internet Gateway. Drag and drop onto the canvas.

Request visualization

HTTP, HTTPS, SQL, cache reads, queue messages and more — animated as packets traveling between services.

Auto-send mode

The engine detects entry and exit points from your graph and fires a continuous stream of requests so you can study load behavior.

Auto Scaling

EC2 instance counts grow and shrink under load. Thresholds and min/max are configurable per resource.

Failover

Trigger and recover failures on any resource to see how ELB health checks reroute traffic.

Cost calculator

A rough hourly cost estimate of your topology, updated as you build.

Save and load topologies

Up to 5 named save slots. Compare designs side by side.

Easy / Real mode

Easy mode shows concise Japanese logs for beginners. Real mode shows detailed English technical logs with hints always visible.

Per-service config

Double-tap a resource to tune rate limits, cache TTL, scaling thresholds, Multi-AZ, and more.

Error guide

When a request is dropped, the log explains why and how to fix it — with the actual resource name in the message.

Multilingual

Japanese and English. Auto-follows your device language.

Pro upgrade

All 16 services unlocked, unlimited resource placement, 5 save slots, and ads removed. One-time purchase.

Who it's for

  • Cloud beginners who want to visualize service relationships
  • AWS certification candidates connecting diagrams to actual behavior
  • Engineers explaining architectures to teammates
  • Users of our companion app PAKEDOU ready for the next step beyond networking

Supported platforms

  • iOS 16.0+ (iPhone / iPad)
  • Android 8.0+ (API 26+)