The Rachio Smart Sprinkler Controller changes the way you water. It makes running your sprinklers easy and convenient while saving you water and money. Rachio automatically creates a watering schedule that lowers your water bill and ensures the beautiful yard you want, while the mobile app gives you access to your sprinkler system from anywhere. Plus, Rachio is compatible with nearly any sized yard and smart home platform.

This is the companion app to the industry leading Rachio Smart Sprinkler Controller.
From version Rachio 2.8–236:
Fix for large number of devices and remote control usage.
All versions
August 4, 2017