If you don't already follow We Are Teachers (https://www.weareteachers.com/) you might want to consider it. They have a TON of classroom ideas and free printables available. I do follow We Are Teachers and I get an email from them weekly.
This weeks email included a short list of Classroom Noise Monitor Apps that I thought would be helpful in a number of situations. Most of the "apps" are actually websites, with one Google app thrown in. The websites work on all computers, Chromebooks and tablets (iPad and Android). These apps could be used by you, as the teacher, for the whole class or by individual students to help him/her monitor his/her own noise level.
Please take the time to read the article and try one out with your classroom today.
5 Classroom Noise Monitor Apps to Help Calm the Chaos (https://tinyurl.com/y6p8aoa2)
by Jill Staake