Here is a doorbell that lets you see who is knocking at your door on your smartphone. The i-BELL is a WiFi doorbell that connects directly to your smartphone and enables you to see and talk with whomever is at your door. When someone rings your bell, the i-Bell will call you, so you can answer your door quickly. It has a 1080p HD camera with a FoV of 180 degrees. It is weather proof and has a 2 way audio speaker and microphone system.
i-BELL provides you with low battery, WiFi signal, and disconnect alerts. It has a motion sensor and night vision capability. It will be HomeKit compatible. You can support it on Kickstarter.