While Yoti emphasizes facial age estimation, ID document, data checks, and , digital ID; K-ID Platform age signals, parental/guardian confirmation, facial estimation, and document checks; and Persona emphasizes Facial age estimation, government ID. Yoti claims 1.04-year average error at ages 14-18, while 1.77-year average error at ages 13-16, and K-ID does nor publicize its error rates.