The good news is that even if you need a ton of stuff, SimpliSafe is still a lot more affordable than a system like ADT or Vivint. And unlike ADT and Vivint, you can order SimpliSafe online and add on additional sensors as you need them. You can get basic 24/7 professional monitoring with the SimpliSafe Standard plan, which costs $17.99 per month. But we recommend you go with the SimpliSafe Interactive plan, which costs $27.99 per month. Plus, if you want to use SimpliSafe security cameras, like the Video Doorbell Pro or the SimpliCam indoor camera, then you can view footage in the SimpliSafe app without paying a separate cloud storage fee. Just know that without a monitoring plan, your SimpliSafe system is a bit useless. If an intruder trips the alarm, the SimpliSafe base station will set off a loud siren sound, but that’s it. You just have to hope the sound alone scares off whoever’s breaking in.