Do you have an idea for an app that uses image recognition but do not want to reinvent the wheel? Are looking for a quick proof-of-concept without spending months plowing through the latest computer science papers? Then one of the following commercial services might be right for you:

General image recognition

Moodstocks - General image recognition API (on device & cloud), iOS/Android/Phonegap/HTTP API/Xamarin, free plan available

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Camfind -  Image recognition API (Cloud only), iOS/Android SDK, ready made app for iOs/Android, free plan available. 

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Qualcomm Vuforia -  Image recognition API (on device & cloud ), iOS/Android SDK, free plan available  

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Catchoom -  Image recognition API (cloud only), iOS/Android SDK, free plan available 

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Recognize.im -  Image recognition API (cloud only) 

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Rekognition -  Image recognition API (cloud only) 

Face recognition:

Face++ - Face recognition API (Cloud only) 

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Animetrics - Face recognition API (Cloud only) 

Unlike other, bigger lists of image and face recognition APIs that include open-source libraries and sometimes abandoned Github projects, this list focuses on ready to go commercial solutions with at least a free trial sign-up. To my surprise, these two basic criterias made the list amazingly short. Did I miss some?