Image Search Options is described as 'provides a set of highly customizable reverse image search context menu options' and is an app in the Web Browsers category. There are more than 10 alternatives to Image Search Options for a variety of platforms, including Online / Web-based, Mac, Google Chrome, Linux and Opera. The best alternative is TinEye. It's not free, so if you're looking for a free alternative, you could try Google Images or NooBox. Other great apps like Image Search Options are Search by Image (Free, Open Source), SauceNAO (Free), Yandex.Images (Free) and Qwant 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.
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Search by Image vs Image Search Options opinions
pros, cons and recent comments
braky It's the same, but as an open source extension.
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.
Reverse image search on iPhone, iPad and iPod Touch. Safe Design app is a great tool to find stolen or un-attributed images on the internet. Last check dates, search by name, customizable notifications, icon badges and more.