The best alternatives to Lockitron Bolt are August Home, SMADO INC, and Doorport. If these 3 options don't work for you, we've listed a few more alternatives below.
Doorport built a device that can be wired into existing buzzer systems, allowing you to use your smartphone to unlock your building’s door for yourself and your guests with a quick tap
This portable safety gadget locks doors in a slightly open position and prevents finger injuries. The open gap can be adjusted to let cats in/out of rooms while keeping dogs/kids out. Easy to install- No tools, drills, or glues. Leaves doors damage-free!
Wyze Lock will notify you if your door is left open and won't auto-lock on an open door. Wyze Lock tells you when the door is open, who unlocked it, and how the door was unlocked. Voice controlled. Works with Alexa and Google Assistant. Wyze Lock can be controlled hands-free.