Question 1

Is the system design simulator free?

Accepted Answer

Yes, the VisualCoders System Design Simulator is free to use. You can access the drag-and-drop canvas, run traffic simulations, and attempt scenario challenges at no cost. An account is required to save your designs to the cloud.

Question 2

What system design topics does the simulator cover?

Accepted Answer

The simulator covers the full range of distributed systems components — load balancers, API gateways, databases (SQL and NoSQL), caches (Redis, Memcached), message queues, CDNs, microservices, reverse proxies, service meshes, and more. Scenarios range from URL shorteners to real-time chat apps and video streaming platforms.

Question 3

Can I use this to prepare for FAANG system design interviews?

Accepted Answer

Yes. The simulator is built specifically for system design interview preparation. It includes real interview-style scenarios asked at companies like Amazon, Google, Meta, and Microsoft. The traffic simulation and failure injection features help you reason about trade-offs — exactly what interviewers look for.

Question 4

Does the system design simulator work for beginners?

Accepted Answer

Absolutely. Beginner scenarios like URL Shortener and Notification Service walk you through foundational concepts with step-by-step hints. You can start the simulator with zero prior system design knowledge and progressively tackle more complex scenarios as your understanding grows.

Question 5

What is the difference between beginner and expert scenarios?

Accepted Answer

Beginner scenarios involve 3–5 components and focus on single core concepts (hashing, caching, basic scaling). Expert scenarios involve 10+ components, require reasoning about consistency vs. availability trade-offs, handle millions of requests per second, and expect you to design for failure, geo-distribution, and data partitioning.

Scenario Challenges