I have an idea for a startup in which the current company that I am a full-time employee for could be a potential customer. It would be a tool to facilitate som

I have an idea for a startup in which the current company that I am a full-time employee for could be a potential customer. It would be a tool to facilitate some of the workflow that we've had an issue with, but nothing related to the industry in which we operate. We didn't really sign a non-compete or an NDA, but I am very curious if there is some kind of basic guideline for potential conflict of interest in a situation like this. Besides the immediately obvious things like never work on it with company equipment or during work hours.