badgeify

Install command: 
brew install --cask badgeify

Name: Badgeify

Add apps to the menu bar

https://badgeify.app/

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

Cask code: badgeify.rb on GitHub

Current version: 1.8.7

Current version requires: macOS >= 10.13

Versions:

Intel tahoe 1.8.7
sequoia 1.8.7
sonoma 1.8.7
ventura 1.8.7
monterey 1.8.7
big sur 1.8.7
catalina 1.8.7
mojave 1.8.7
high sierra 1.8.7

Analytics:

Installs (30 days)
badgeify 56
Installs (90 days)
badgeify 112
Installs (365 days)
badgeify 275