SystemLore

Keep the internet alive.

Build, route, and recover before users drop.

No signup needed · 5 minute runs

Learn scaling by keeping one service alive under pressure.

Each chapter teaches one system-design move, then forces you to defend it with budget, latency, traffic, and failure pressure. Unlock the next concept only after the current design survives.

CAMPAIGN

RPS0req/s

P95—target 250ms

ERR0% of req

COST$0

APIDBCACHE

STABLE

0s

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Achievement

Studio

Drag a component from the left onto the canvas. Switch to Wire to connect them.

Drag components here to start designing
Client → Load Balancer → App → Cache → Database

Keep the internet alive.

Campaign one box to planet scale

Learn scaling by keeping one service alive under pressure.

Client Mode