xscope

Install command: 
brew install --cask xscope

Name: xScope

Tools for measuring, inspecting & testing on-screen graphics and layouts

https://xscopeapp.com/

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

Cask code: xscope.rb on GitHub

Current version: 4.7.2,144

Requirements: macOS >= 12

Analytics:

Installs (30 days)
xscope 8
Installs (90 days)
xscope 41
Installs (365 days)
xscope 168