Ask HN: How to comunicate more clearly my project idea?

I'm working on a project to build a web application that takes spreadsheets from users and automagically (asking some questions to the user) makes a custom webapp for the same uses that the original spreadsheet [0]

I find it pretty difficult to comunicate this idea to people, in the sense that it is difficult for them to understand what I mean. In general, they misinterpret something (for example thinking that I offer a consultancy service, or that I'm going to make an app for a specific vertical) or they ask questions until they understand and at the end they say "you should have said X" and I said X but with one or two different words from other people's "you should have said Y".

I don't want to blame them, because I think is a limitation from my side of the conversation, but I don't know how to improve on this, and that is what I need help with.

I've tried repeating the concept with different words or using more or less examples but it is like they need to discover it themselves to really understand and I feel like theres nothing I can do to help that understanding.

Thanks in advance for any comments or advice

[0] Corresponding ApplyHN submission https://news.ycombinator.com/item?id=11458094