codequest / system design
Sandbox

Build anything. Watch what breaks.

Start small, push the traffic up in the Traffic tab, then fix whatever turns red in the Build tab.

Healthy at 300 req/s
p95 latency (server)
58 ms
Error rate
0.0%
Est. cost / month
$220
excl. bandwidth
App servers
400 req/s each · $40/mo
2
DB read replicas
+1,250 reads/s each · also applies every write · $120/mo
0

Primary DB: 1,250 queries/s (1 query per request). How the numbers work