Rachio is offering a $50 rebate for units purchased by May 29, 2017. The Rachio rebate is in the form of a gift card from Amazon. The 8 zone controller is available at Amazon for $200, effectively making it $150 (25% off). The 16 zone controller is also available for $246, making this just under $200 (20% off).
Rachio has a standalone app for Apple and Android devices which you can use with the controller. This will give you the ability to control your irrigation system. The controller can be used with Amazon Alexa and Samsung SmartThings.