Auto crop: it automatically removes the borders of a picture (very useful when searching by screenshots). Two additional search engines: Bing and Yandex. iOS Extension: Use Reversee inside other apps (Photos, Safari, Chrome and any app that "exports" an image or URL).
Open the results page in: 1) Safari, 2) Chrome, 3) Add to Reading List, 4) Copy to Clipboard, 5) Send Email, etc. Set size of the image sent to the search engine (it may yield different results). Smart navigation of your device photos (you can search by a picture in the middle of the camera roll and then come back to search for a picture nearby, avoiding to scroll the photos all over again).
Search with Google Images (default search engine). The actual search is made by third party engines, and even if they are the best on the business, none of them cover 100% of the searches. PS: Although the app allows you to search for pictures, it doesn't promise you will find results. A higher resolution version of a picture. Reversee is a bridge between your pictures and reverse image search engines, allowing you to make a search by image.