face-api.js

Combines face detection, recognition, landmark detection, expression analysis, and age/gender estimation in one library, as shown in the chainable API like .detectAllFaces().withLandmarks().withExpressions().

Operates entirely on the client side in browsers or Node.js, eliminating cloud dependencies and keeping sensitive facial data local, which enhances user privacy and reduces latency.

Uses quantized models such as the 190KB Tiny Face Detector, balancing accuracy with minimal footprint for real-time applications in resource-constrained environments.

Offers chainable methods for easy task composition, simplifying development with examples like detecting faces and computing descriptors in a single fluent call.