What’s your go to way to automate external security posture checks for a domain?

I'm a security researcher and run security programs, and sometimes clients ask for quick external perimeter or posture scans of their domain before a review.

I’m specifically looking for something that’s fully automated and the only manual step should be entering the domain/address, and then it just runs on its own (scheduled scans would be a plus). Ideally it should actually cover the usual external posture stuff like discovery, basic checks and useful reporting without turning into a giant enterprise platform.

From my own research, a lot of the tools that do this well are pretty expensive and I’m trying to find solid alternatives, that are open-source or budget friendly, that people actually trust and use.

What tools/workflows are you using for this today? Would appreciate if the tools are easy to deploy, noise free and produces readable, non-technical output/reports.