Smart plugs are among the simpler smart home devices, giving you app and voice control over appliances like lamps, fans, humidifiers and basic coffee makers. Some can even help you save on your energy bill, too. You can also create schedules and routines, either through a plug's proprietary app or through your preferred smart home platform. But much like other IoT devices, which system plays nice with which plug depends on compatibility, and each brand's app offers different features. We tested out ten popular options to see which are worth buying. What to consider when buying a smar...