SparkChess is a simpler game-based platform (and also an app). It lets you play vs. the computer with 5 difficulty levels and provides a “Coach” that suggests moves. Its AI “characters” (Cody, Boris, etc.) simulate human-like play (even making mistakes). SparkChess includes an opening database and basic tutorials. A free version is available online, and paid upgrades unlock advanced multiplayer and remove limits. It’s more of a chess game than a training site, but it’s an accessible way to play AI opponents on any device.