YourSimulation EngineOpen-source discrete-event simulation

A zero-dependency TypeScript engine for service, queue, and network systems — estimate waits, utilization, and throughput, and find the cheapest design that meets a service target. MIT licensed.

API & CLI

Blocks

Examples

Try the app

12 building blocks

source, queue, resource, delay, seize/release (+ resource pools), assign, batch, separate, match, branch, sink — compose any service or network system.

Models the real world

Reneging and balking, join-shortest-queue and class-based routing, shared resources held across steps, preemptive priority, machine breakdowns, and assembly.

Rigorous & reproducible

Seeded replications with 95% confidence intervals, validated against closed-form queueing theory — M/M/1, M/M/c, Erlang-A, M/M/1 preemptive priority, and breakdown availability.

Run & optimize headless

A CLI and a clean library API — run experiments and a Cross-Entropy optimizer from the command line or your own code, with zero runtime dependencies.