In short: If you are shopping around for a tool like this, there is really no competition.
2021-05-06 (5 stars)
This is the update I have been waiting for. I took a leap of faith, and opened MathPix in a floating window (iPad). I was thrilled that this worked. Even better, when I took a screenshot, I was able to drag it right into MathpixSnip . I really appreciate that the developers implemented the features I was asking for. I'm finally able to leave my MacBook at home, as my entire workflow fits within iPadOS.
2021-04-09 (was still 3 stars)
Still using this mostly on laptop or desktop. Happy that they have the handwriting feature (which does not feel smooth), but still a little bummed that I cannot share a screenshot to mathpix without opening MathpixSnip and importing from the camera roll. I would like to see a share option in iOS for "scan in MathPix". Also, as I have become more used to working on an iPad, I have become dependent on apps that allow me to multitask. MathpixSnip still does not support splitscreen.
2020-09-27
Still no share menu support for screen shots. MathpixSnip is still frustrating enough that I open my laptop to do snipping. I would like to do snips without opening MathpixSnip if it is not going to be updated for iPadOS
2020-06-29
As someone trying to do more of my workflow on iPadOS, I was happy to see MathPix had an app. I am trying them out on my Mac now and I am likely to subscribe because of the quality of the OCR itself. Unfortunately, without landscape mode at the very least on my iPad, it is hard to decide if the headache of typing LaTeX or the neck pain of trying to use MathpixSnip with my head rotated 90 degrees. Not to mention, it does not seem to reachable from the share menu, so I cannot take a screenshot and share the cropped result to mathpix.