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The main drawback behind Nest Secure is that it’s more expensive than other systems we tested at $400. If you want professional monitoring, Nest Secure has a partnership with Brinks Home Security that offers no contract $29/month and three year contract $19/month options. You can also use the system without monitoring, which doesn’t require a monthly fee. Read the full reviewAffordable MonitoringSimpliSafeLow StockSimpliSafe The Essentials$14. 99/mth?Visit Siteat SimpliSafeAffordable professional monitoringLimited smart home compatibilitySimpliSafe is one of the best DIY home security systems for professional monitoring, which costs around $15 a month. This is a lower price than Scout and abode, though
it lacks smartphone app controls. Unlike the competition, SimpliSafe uses a cellular connection for its primary connection, something that other systems only use as a backup. The company also offers a great
selection of security and safety sensors. The system is easy to set up and comes with a detailed instruction booklet. SimpliSafe's three year warranty is the best among DIY security systems, with most competitors only offering one year of coverage. If you want to control your SimpliSafe system with a smartphone, you can expect to pay about $25 a month, which is higher than average.