We're big admirers of FiftyOne. Kangas is similar in its approach to UI and some other aspects, but our focus is different. In particular, FiftyOne is really laser-focused on computer vision, whereas Kangas is a more general EDA tool that happens to have some CV features.

To give a more concrete example, Kangas handles all kinds of data, and we put a lot of work into autogenerating charts and aggregate statistics from your dataset regardless of the kind of data you log. Our immediate roadmap involves broadening this even further, adding more advanced support for video, audio, and more. But, we don't have as deep of a feature set specifically for computer vision as FiftyOne.