webCoRE is the birth child of all things right with CoRE heavily updated to include creating Pistons in a web browser.
You can also copy already made Pistons for tweaking or just plain old being lazy. It’s more powerful, way more quicker and IMHO, way more intuitive than the original CoRE. I still use CoRE as well. However, most of all my new Pistons are done using webCoRE.
What would have taken me 5 minutes in CoRE, takes me 2 minutes in webCoRE and even less than that if I am just copying an already made rule.
Give it a go. Easy install.