chaiNNer is described as 'A flowchart/node-based image processing GUI aimed at making chaining image processing tasks (especially upscaling done by neural networks) easy, intuitive, and customizable' and is a Image Upscaling app in the photos & graphics category. There are more than 50 alternatives to chaiNNer for a variety of platforms, including Windows, Web-based, Mac, Linux and Android apps. The best chaiNNer alternative is Upscayl, which is both free and Open Source. Other great apps like chaiNNer are A1111 Stable Diffusion WEB UI, waifu2x, Comfy and Topaz Gigapixel.