Roblox developers often win by bringing a game that is proven on Steam to Roblox before anyone else does. This page measures where that has not happened yet.
Method after IdeaPlotter (recipe by SyntheticBeef). Data: RoTrends, Roblox games API, Steam store and SteamSpy via the FronkonGames dataset. Similarity is a guide, not proof that a market exists.