Question: I need a system that provides a fast and secure way to grant building access and event entry using facial recognition technology.

PopID is an all-purpose identity verification system that uses facial recognition for building access and event entry. It's designed for rapid enrollment and stores your digital key in the cloud, where it can be used for contactless transactions. Features include face verification through selfies, user-controlled recognition for privacy, and integration with payment processes for safety and efficiency.

Another good option is Facia, a premium facial recognition technology that includes face recognition, liveness detection and face matching. Facia is designed to thwart fraud and spoofing in a variety of industries, with 100% protection against deepfakes and injection attacks. It supports a variety of use cases, including access control and government surveillance, and is designed to protect data privacy with GDPR compliance.

For a cloud-based option, Luxand offers a facial recognition API that can be easily integrated with web and mobile apps. Luxand offers a variety of features, including liveness detection, face cropping and facial landmark detection. It's designed to handle large volumes of photos, and offers flexible pricing options, so it can be used in a variety of industries, including biometric authentication and access control.