How I Use It
I used Quizizz to see how well my students had prepared for an exam, so I ran a practice quiz using Quizizz. The students knew of another type of formative assessment (Kahoot), but soon adapted that their questions were on their laptop or phones and not projected up. Soon students were challenging themselves and others to see who could do better. We ended up playing this three times since students kept wanting more. They enjoyed seeing their scores and rankings which appeared to challenge them even more.
I found an interesting observation by a student. She didn't score as high as the first time, but she noticed she correctly answered more questions, and had fun with it.
I think this is just another available tool very similar to Kahoot!, but with the ability to assign or complete as homework. I like the data that can be downloaded to refer back to and support students individual learning.