Security systems don't have to come with a hefty installation fee—you can easily install DIY alarms on your own, like our top pick, SimpliSafe. With the most proactive monitoring in the game, SimpliSafe is doing the most of any home security company out there to help stop a break-in before it happens.
Active Guard monitoring and a three-pronged emergency dispatch protocol, along with affordable, no-contract monitoring, a long warranty, and a 60-day return policy, make SimpliSafe our undeniable pick for the best DIY home security system of 2025. Its smart home compatibility could be better, but it's a great choice if you're prioritizing security over home automation.
Read on to learn more about how SimpliSafe handled hands-on testing and how it compares to other monitored security systems.