Nandbox for actual native app development?

I'm trying to build my own app, but I have little to no coding experience or knowledge, so ive been exploring the scene of no-code app builders. So many have been great, but they all seem to be web apps dressed as native apps, until I found a super niche brand called nandbox. It seems to fit all the checklists as it is fully no-code and produces full native apps, apparently, but I wonder why they are not known?? Does anyone have experience with it? I'd love to hear some reviews before paying for their plans.

They also say they support full API integrations with zero code and that their native Cells all follow M3 and M2 design. can someone more knowledgeable confirm if that is true?