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How does it works?
Like Cloud Vision, Google’s image recognition API, Siftr has developed their own image recognition engine that analysis the content of an image to determine whether it’s junk or not. It requires an active Internet connection because the image analysis is done on Siftr servers and not locally on the mobile phone. However it is unlikely to blow up your data plan as the app only uploads a small hash of the image and matches it against their own database of images.
An iPhone version of Magic Cleaner is still under development. The app is free to auto-delete limited number of images in single run. If you want to delete more images, just refer the application to your friend or wait for a day.