https://www.cnet.com/news/august-video-doorbells-welcome-you-with-free-video-clip-storage/

August, which was acquired by Yale's parent company Assa Abloy in December 2017, makes DIY doorbells and door locks. Unlike deadbolt manufacturer Yale, August's locks retrofit to most standard deadbolts. Its Wi-Fi Doorbell Cam Pro replaces existing hardwired buzzers, but adds in HD live streaming, support for Amazon Alexa and Nest, an integrated floodlight and now -- free 24-hour motion-based clip history. 

Anyone with August doorbells and August locks at home can access both devices from the same screen, making it possible to see who's at the front door and unlock it to let them in, as needed.