PimEyes is described as 'Uses real facial recognition algorithms to compare a submitted photo with images of about 10 million people. The database obviously contains many freely available images from the Web, including Wikipedia' and is a Image Search Engine in the Online Services category. There are eight alternatives to PimEyes, not only websites but also apps for a variety of platforms, including Android, Opera, Firefox and Mac. The best alternative is TinEye. It's not free, so if you're looking for a free alternative, you could try Google Lens or SauceNAO. Other great sites and apps similar to PimEyes are Search by Image (Free, Open Source), trace.moe (Free, Open Source), PicsLikeThat (Free) and Lookuq (Free Personal).
SauceNAO is a reverse image search engine. The name 'SauceNAO' is derived from a slang form of "Need to know the source of this Now!" which has found common usage on image boards and other similar sites.
SauceNAO vs PimEyes opinions
pros, cons and recent comments
Very limited sources. Matches are often not very similar.
Search by Image is a Firefox extension which enables you to initiate a reverse image search from the right-click context menu or the browser toolbar, and comes with support for more than 30 search engines.
Lookuq is a Visual Search-as-a-Service platform that lets developers train their own image recognition model without coding. Lookuq image search API can be integrated to websites and apps as a service.
Adds an option to the context menu to search with an image on Google, Bing, Yandex, TinEye, SauceNAO, IQDB or custom search engines. You can also choose more than one and they will be shown in a submenu!.