Can anyone tell me please how I can find out if someone is using a keylogger on my Mac. Thank you

Does anyone know how to Tell If Someone Has Put Keylogger on Your Computer? thank you

Unless you know exactly what state it was in before, and by that I mean that you have a record of all installed files and their cryptographic hashes, there's no way to be sure. You won't find a file called something like "Keylogger.app." It will be well hidden and disguised. You also have to consider the possibility of a hardware keylogger, which isn't software at all.
If this is your Mac, and you have reason to suspect it's been tampered with, the only thing to do is erase the boot drive, reinstall the OS from known-good media, and then restore all your applications from known-good originals and your data from known-good backups.
If it's not your Mac, you should have no expectation of privacy while using it, whether it has a keylogger or not.

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