Numifylab is built and maintained by one person, and I read every message that comes through this form myself — there's no support team filtering things out. Whether it's a bug you found, a calculator you wish existed, or something that just seemed off, I'd like to hear about it.
I try to reply within a few days, though it can take a bit longer if I'm in the middle of building something. If you're reporting a bug, mentioning which calculator, what you entered, and what went wrong helps me track it down faster.