What Sells Next is an independent research platform built for Etsy sellers. It provides keyword exploration, estimated monthly search volumes, competitor listing comparisons, and shop tracking to help sellers identify viable product opportunities. Its Crossover Lab feature turns keyword research into fresh product ideas, while a Listing Helper reviews and suggests improvements to existing titles, descriptions, and tags. A free tier covers core research, while a Premium plan unlocks market briefings, deeper product research, and listing-build tools.