libfaceid is a comprehensive face recognition library that seamlessly integrates multiple detection and embedding models ranging from basic Haar Cascades and LBPH to advanced MTCNN and FaceNet. The framework provides modular model selection through constructors with a unified detect/estimate API, enabling users to mix and match detectors with encoders. It also includes liveness detection models for anti-spoofing, plus auxiliary models for age, gender, emotion, and facial landmark estimation, alongside TTS/STT speech synthesis and recognition capabilities.