System design / 2 simulations
System Design Basics
How a request travels, and how big the system has to be.
Open the lab → Change the load, break a part, watch what happens. Free, no sign-up.
All topics: foundations
- Back-of-the-envelope capacity planningBeginner · 8 min
Turn daily users into requests per second, storage, bandwidth and a server count, with every step shown.
- Everything before the first byteBeginner · 6 min
DNS, TCP, TLS and HTTP packet by packet. Compare HTTP/1.1, HTTP/2 and HTTP/3 across the world.