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We also evaluated their associated mobile apps, features and benefits. Based on our results, we believe the Nest Protect is the best smoke detector you can buy. It’s a breeze to install and set up, and it’s the only smoke detector we reviewed that passed every detection test we put it through. Best OverallNest ProtectThe Nest Protect is the best, most advanced smoke detector available on the market today. It is the only device we reviewed that passed all our tests, and we found it was the easiest to install, connect and use. View SiteBest ValueKidde KN COSM B RFThis is the least expensive smoke detector we reviewed, and it’s easy to install because it doesn’t hardwire into your home’s electrical grid.