The article from RapidAPI provides an overview of the top 10 facial recognition APIs and software for 2021, highlighting the growing interest in facial recognition technology, especially following the introduction of the iPhone X's Face ID. After evaluating over 31 APIs, the article lists Kairos, Animetrics, Lambda Labs, Inferdo, Luxand.cloud, EyeRecognize, Face++, Macgyver, Microsoft Computer Vision, and BetaFace as the leading options. Each API offers unique features such as age and gender detection, deep learning capabilities, and emotion recognition, catering to various software needs. The article also notes the importance of ethical considerations and compliance in the use of facial recognition technology, while providing insights into the popularity, pricing, and capabilities of each API. Additionally, OpenCV is mentioned as a notable open-source alternative, and the article encourages developers to explore these tools for integrating facial recognition into their applications.