As compared to tools that produce one-liners, this one captures everything in great detail. If Google is supposed to understand the image in order to rank your page higher, or if a visually challenged person uses accessibility features, this is the tool to use. It reads text, logos, emotions, colors, and whatever else is happening in the image. There is the option of providing SEO keywords to include in the alttext. Yhe description can be edited in the app, too though I didn't need to. It's quick and I prefer it over others that promise integration with WordPress, etc.