opensoundmeter

Install command: 
brew install --cask opensoundmeter

Name: Open Sound Meter

Sound measurement application for tuning audio systems in real-time

https://opensoundmeter.com/

Cask JSON API: /api/cask/opensoundmeter.json

Cask code: opensoundmeter.rb on GitHub

Current version: 1.4.1

Current version requires: macOS >= 10.12

Versions:

Intel tahoe 1.4.1
sequoia 1.4.1
sonoma 1.4.1
ventura 1.4.1
monterey 1.4.1
big sur 1.4.1
catalina 1.4.1
mojave 1.4.1
high sierra 1.4.1
sierra 1.4.1

Analytics:

Installs (30 days)
opensoundmeter 14
Installs (90 days)
opensoundmeter 39
Installs (365 days)
opensoundmeter 124