What are some alternatives?
When comparing E-Robot and Trigger, you can also consider the following products
Tasker - Tasker is an application for Android which performs Tasks (sets of Actions) based on Contexts...
Automate - Automate various tasks on your Android smartphone or tablet.
MacroDroid - MacroDroid - Automation for your Android Device
Workflow - Powerful automation made simple.
Llama - Phone going off at night? Annoying your colleagues at work? Get Llama!
Automagic Premium - Automagic Premium is the magic wand to automate your Android device.