Facebook explicitly states they do not allow people to track who views their profile [20].
If you want to view someone else's profile without them knowing, there are a few legitimate (though limited) methods and some specialized tools: facebook profile viewer online
Facebook’s official policy has always been that profile views are private. While platforms like LinkedIn allow you to see who viewed your profile, Facebook has explicitly chosen not to offer this function for personal accounts. (Note: Business Pages do offer "Page Insights" showing aggregated data, but not individual profile viewers.) Facebook explicitly states they do not allow people
: Installing these apps often leads to viruses, ransomware, or browser extensions that log your keystrokes. Data Harvesting facebook profile viewer online