Meet the ChefSteps Joule: a smart sous vide device with WiFi and Bluetooth to connect to your smartphone. It holds the temperature accurately and heats up water faster than comparable cookers. Its temperature control is accurate to 0.2F. The magnetic base and clip allow you to use Joule in any pot.
Joule is compatible with iOS and Android devices. It lets you control it via voice thanks to Amazon Alexa support. Costs under $200 at this time.