Question: Can you recommend a cloud-based service that can analyze facial expressions to determine emotions and age in photos?

If you need a cloud-based service that can analyze facial expressions to infer emotions and age in photos, Luxand is one of the best options. Luxand has a full-featured facial recognition API that includes emotion detection, age and gender detection, and facial landmark detection. It can handle large volumes of photos with scalability and offers several integration options using programming languages like Python and JavaScript. The service offers several pricing plans depending on your needs, including a 14-day free trial and 24/7 technical support.

Another contender is Facia, which offers advanced facial recognition technology. Facia offers a variety of services, including face recognition, liveness detection, age verification and more. It's designed to thwart fraud and spoofing attacks across many sectors and to protect privacy with GDPR compliance. Facia also can store data on your own premises and offers strong integration options, so it's good for many use cases.

Imagga is another general-purpose cloud-based service that includes facial recognition among its range of image recognition abilities. Imagga's API also includes image tagging, visual search and content moderation, so it's good for many industries. The service offers several integration options and customizable machine learning technology, with pricing based on the number of API calls. It's used by more than 200 business customers and has a large developer community.