In the past few months, we have covered plenty of amazing iPhone apps that use machine learning and AI to better serve you. LemonVision is also worth a look. It is a clever app that can apply a trained classification model to your photos. It can also translate the recognized items to various languages.
This app uses a Inception v3 trained model to get the job done. It can detect objects in images from a set of 1000 categories. You can find out more about it here.