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: 1.9.2

Requirements: macOS >= 10.15

Versions:

Intel tahoe 1.9.2
sequoia 1.9.2
sonoma 1.9.2
ventura 1.9.2
monterey 1.9.2
big sur 1.9.2
catalina 1.9.2

Analytics:

Installs (30 days)
badgeify 32
Installs (90 days)
badgeify 138
Installs (365 days)
badgeify 360