Kalkulio: convert excel to webform - useful for you?

Hi Guys!
We are building www.Kalkulio.com – it creates responsive web calculators from your excel file. You can embed it to your webpage or connect to your system via API.

I think it is great software, we are using it on this printshop https://www.asaprint.sk/vizitky-online

Do you think it might be useful for you?
I am trying to find customers, but I do not know where to start and how to approach them. Thanks for your ideas :).