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: 1.9.0

Requirements: macOS >= 10.13

Versions:

Intel tahoe 1.9.0
sequoia 1.9.0
sonoma 1.9.0
ventura 1.9.0
monterey 1.9.0
big sur 1.9.0
catalina 1.9.0
mojave 1.9.0
high sierra 1.9.0

Analytics:

Installs (30 days)
badgeify 62
Installs (90 days)
badgeify 126
Installs (365 days)
badgeify 313