Intelli Hash is a powerful app to get hashtag suggestions from images. It uses powerful image recognition API from Imagga. The app is open source. Using the Intelli Hash app, you can not only get suggestions for hashtags but also copy and share these hashtags on other media.
I'm using a product called Autohash for some time, which basically does the same thing. Only better. This one seems to just trying to spin off the success of the other product.
