Is Quantity Supply only for DDI users?

No, DDI Inform is just the first ERP we integrated with — it's an example, not a requirement. Quantity Supply works without DDI Inform, works standalone, and can connect to other ERPs, including Epicor, Spruce, NetSuite, Priority ERP, QuickBooks. The goal is to build connections to the other major ERPs distributors use, one customer at a time. If you saw it demoed with DDI Inform, that's one setup, not the only one.