Free cam without credit
I don't know of any other company that offers that service.It takes away the fear that the cameras could be easily stolen because they are not tethered.I think 720P is a good compromise to offer a system that works well on a battery and still delivers.Depending on how and where it is mounted you will see colors fine and enough detail to be usable for most of your needs.You can adjust the distance and area it monitors to tweak this a bit but it could use more refinement.The pro version coming out allows for drawable zones. To view a live feed from the camera it needs a motion detection.The new pro doorbell offers swappable cover plates and a smaller form factor but these all come in black.
Stick up cam boasts a battery life cycle of a year.
Nest does well but it has to be plugged in and doesn't offer an outdoor solution without a separate housing.