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I just made a couple research and some of my pictures are also being use in some mobile apps/websites.

Does anyone has a tool to check if pictures are being hosted somewhere else ? I don't want to run 100 queries on google.

I'm not sure exactly what you are asking for, but TinEye reverse image search might be what you are after?

tineye looks great and even has a (commercial) API. When we tried it however, it could hardly find any image.

Google reverse image search seemed to produce many more results, including images appearing inside youtube videos!