Gemini for Mac is a

duplicate file finder

application. It scans your hard drive (or selected folders) to locate and identify duplicate files, allowing you to delete them to free up disk space and improve your system[SQ]s performance. Unlike simple file comparison tools, Gemini uses sophisticated algorithms to identify duplicates even if they have different names or are in different formats (e.g., a JPG and a TIFF of the same image). It presents you with a visually clear overview of the duplicates found, letting you choose which ones to keep and which to delete with ease.