I have used Kahoot for awhile now and have transitioned more to blooket which is similar but students seem to enjoy it better. I have also used quizlet for vocabulary which is another game online that kids enjoy. In quizlet they can play as individuals or by random groups. I use it as a group where each person are working on the same question but only one person has the answer on their computer.
Kahoot works really well as a formative assessment tool. The issue I have with it is that sometimes the students get too competitive and are more concerned about answering the questions quickly rather than correctly.
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I had been using Kahoots for the first 8 years of my teaching. However I would encourage many of you to try and using Blooket. It is something that is very similar to Kahoot, however my students enjoy it even more than Kahoots.