For real-time face recognition help, you might also want to check out Google Lens, a built-in feature across many Google apps that uses your phone's camera to identify and offer information about objects, text and other subjects. It can perform visual search for matching products, recognize text in real time and identify objects, too, so it's a good general-purpose tool.
Another good choice is Luxand, which offers full-featured SDKs and APIs for desktop and mobile apps. It includes sophisticated face detection and recognition features like facial feature recognition, live video recognition and thermal face detection, which is useful for biometric authentication, attendance tracking and security systems.
Api4ai offers a collection of cloud-native computer vision APIs for a variety of image processing tasks, including face recognition and brand mark detection. Its HTTP API and RESTful design make it easy to incorporate and analyze images and video from any platform, which can be handy for visitor statistics, product identification and inventory tracking.
For a more specialized service, you might want to look at Imagga's image recognition API. It offers image tagging, visual search, facial recognition and content moderation, and customizable machine learning technology. Imagga has multiple integration options and supports a variety of industries, so it's a good option for many real-time facial recognition needs.