Simulator

You can use the Simulator in both Dialogflow ES and Dialogflow CX to test your conversation without incurring any charges.

Here is what the simulator looks like in Dialogflow ES:

And this is what the Simulator looks like in Dialogflow CX:

Given that Dialogflow CX is based on state machines, it provides a lot more information in the Simulator (and you often need all that information to understand what is going on so you can debug your CX agent).

Note: This is my old website and is in maintenance mode. I am publishing new articles only on my new website. 

If you are not sure where to start on my new website, I recommend the following article:

Is Dialogflow still relevant in the era of Large Language Models?