Looks useful and I like the UI, it reminds me of UniFi. After a few minutes I had to force-quit and sent a report. I will buy it, I love messing about and have a reasonably complex home network and have been getting by with a mix of Unix and homemade tools; this is nicer.
Interesting! I haven't run into that. I've been doing a ton of testing to avoid things like that. If it happens again, would you mind emailing me the report via the website? I don't get them when sent to Apple.
Each pixel of such a scanner would need to somehow scan the spectral content. For example, imagine an array of fibers each transporting light from image plane pixel coupled to a spectrometer (bulky, expensive). Slit (a.k.a. push broom) scanners take each pixel of its slit and disperses the light perpendicular to the slit onto a 2D sensor array (more compact, 1D mechanical scan required). I recall seeing spectral (color) filters made from dispersive materials sandwiched between rotating polarizers to filter (scan) the light entering camera (expensive, compact).
Having paid for and enjoyed Narwhal and Apollo, I really hated the official app. After some digging, I found https://github.com/lo-cafe/winston and that's working for me. It's not simple - you have to generate your own Reddit app id and secret, be able to Xcode from source and have a valid Apple ID to install the IPA, but it's worth it to me to spite the enshittified app.