Because Facebook’s API does not share this data, it is technically impossible for external software to provide this information. Here’s what you need to know:
Pay attention to who likes old photos, comments quickly after you post, or appears consistently in your story viewer list. These are the people most likely checking your profile regularly. how to find profile viewer in facebook
If you suspect a specific person (e.g., an ex or a crush), you can look for patterns: Because Facebook’s API does not share this data,