Picsearch is described as 'Find your pictures at Picsearch.com! We have billions of indexed images in our directory, and it continually expands' and is an website in the Photos & Graphics category. There are more than 10 alternatives to Picsearch, not only websites but also apps for a variety of platforms, including Google Chrome, Firefox, Opera and Mac. The best alternative is TinEye. It's not free, so if you're looking for a free alternative, you could try Google Images or Image Search Options. Other great sites and apps similar to Picsearch are Search by Image (Free, Open Source), Yandex.Images (Free), Qwant Images (Free) and Bing Images (Free).
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.