StableMat is an AI tool that allows users to easily run stable diffusion machine learning models with the best hardware and without the need for setup. It features a stable diffusion playground with pre-installed plugins, the ability to create stable diffusion immediately and train image models with existing models, and the option to generate video animations. StableMat has transparent runtime pricing based on runtime use, GPU and disk usage included in the price, and a dedicated GPU playground instance to avoid cold start problems. The tool also offers API access and future access to bonus perks from Spellbook Labs.