What SPT actually is
One app, and a substantial one. SPT ingests fitment from ShowMeTheParts, ACES/PIES XML or CSV, manages brand catalogs, pushes manufacturer specifications and buyer guides onto your product pages, keeps inventory and pricing in sync with your suppliers, exports orders, and puts a Year/Make/Model search with a saved garage on the front of all of it. Comparing that to a fitment app on feature count misses what it is for. It is distributor infrastructure.