The whole smart home concept is about you controlling as many things in your house from your smartphone over the internet. A smart switch / plug-in smart outlet is one more addition to the smart home concept.

Good smart-switch outlet adapters allow you to add smart control (meaning: you can control them via wireless from your smartphone) to your existing outlets.

Good smart outlet adaptoers wok with multuple  smart-home protocols (for example, Amazon Alexa, Google Home, and IFTTT) and devices. They also come with useful apps.

The best plug-In smart outlet: Belkin WeMo Mini (compact, for both Android and ioS, supports  Amazon Alexa, Google Home, and IFTTT)

The second best plug-In smart outlet: iHome iSP8 (support for Apple HomeKit, SmartThings, Wink, and more)

The best affordable  plug-In smart outlet: Geeni Energi (app for Android and iOS devices and Amazon Alexa support)
 

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