Reverse Image Search is a free iPhone application developed by PENGHUI ZHAO. It falls under the category of Business & Productivity and offers a convenient way to find similar images using popular search engines like Google, Bing, and Yandex.

With Reverse Image Search, users can search for images from their Photo Gallery, Camera, clipboard images, and image URLs. The app also allows users to search using multiple search engines, giving them more comprehensive results. Additionally, users have the option to crop their image before initiating a search.

One of the useful features of Reverse Image Search is the search history, which enables users to easily access their previous searches. This can be particularly helpful when conducting research or looking for specific images.

It's important to note that Reverse Image Search offers a subscription service priced at $1.99 per month, which is auto-renewable. Users can manage their subscription and make changes to their account settings through their iTunes account.

Please be aware that while Reverse Image Search utilizes Google, Bing, and Yandex search engines, it is not endorsed or affiliated with any of these services. The app simply provides a convenient way to access these free search engines from your iPhone.

For more information about Reverse Image Search's terms of service and privacy policy, please visit the developer's website.