What's particularly great about this comparison tool is how fast and efficient is can asynchronously compare and synchronize large sets of remote files whether it be SMB, FTP, SSH/SFTP. You can also compare archives to folders and the custom viewers for comparing things like images are a nice bonus.
I had forgotten about this tool, and having worked mostly on Apple hardware for the last 5 years didn't realize they had a macOS version. But when I used it on Windows, it was phenomenal.
Came here to say this. It's an amazing tool. Set it as your git difftool and it will change your life. I switched to Mac about 8 years ago and ran it in Wine for a long long time until they finally released a Mac version. Their diff algorithm is so damn perfect no other diff tool compares, and I've tried SOO MANY. It lives up to its name. It's an amazing tool that's crossed platforms with me, and I'd rather give up my left hand.
Meld is not even close to BeyondCompare. I would also say kdiff3 is better when looking at all my Python merge conflicts in the past. Nevertheless BeyondCompare is on another level when looking at extensibility.