Ask HN: Any suggestions for identifying macOS users in outbound?

I am building an application for macOS. In my outbound sales efforts, I am looking to filter out those who use Windows as their computer.

This is only temporary, but I don't want to waste my time on people who can't even use the software.

LinkedIn has great filters for industry, job title, etc. Is there a service that provides something similar for OS? Preferably with emails or LinkedIn profiles?

I would image this would be possible given all ad platforms track things like Device type, etc. What am I missing ?