InvokeAI is a Stable Diffusion toolkit built around a unified canvas that combines generation, inpainting and outpainting in one workspace, aimed at iterative creative work rather than one-shot prompting. It offers both a graphical interface and a command-line mode, and is positioned as a more production-oriented option than the hobbyist front-ends. A hosted commercial edition exists alongside the open-source project.
Pricing: Freemium