What are some alternatives?
When comparing Workflow and E-Robot, you can also consider the following products
Automate - Automate various tasks on your Android smartphone or tablet.
Tasker - Tasker is an application for Android which performs Tasks (sets of Actions) based on Contexts...
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
MacroDroid - MacroDroid - Automation for your Android Device
Automagic Premium - Automagic Premium is the magic wand to automate your Android device.
DO by IFTTT - Now available in the IFTTT app