Free · open source · inspired by the MIT Beer Game
One small order.
A very big ripple.
Ripple is a supply chain game. Run a retailer, wholesaler, distributor or factory, place one order a week, and discover how a tiny change in demand turns into chaos upstream.
Goods travel towards the customer · orders travel towards the factory · every hop takes time
Play in 10 minutes
Take one seat in a four-stage chain. Smart bots play the rest — no sign-up, works on your phone.
A debrief that explains
Bullwhip ratios, cost breakdowns, a policy benchmark and coach feedback on the exact weeks you over-reacted.
Built for OpEx classes
Lead times, pipeline inventory, information sharing and systems thinking — felt first, explained after.
What is the bullwhip effect?
Customers barely changed. The factory went wild.
In this simulated chain, end-customer demand steps from 4 to 8 cases — once. Each stage only sees the orders of the stage below it, reacts with a delay, and forgets what is already on the way. The swings grow at every step upstream.
Learn why it happens