shottr

Install command: 
brew install --cask shottr

Name: Shottr

Screenshot measurement and annotation tool

https://shottr.cc/

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

Cask code: shottr.rb on GitHub

Current version: 1.8.1

Requirements: macOS >= 10.15

Analytics:

Installs (30 days)
shottr 1,435
Installs (90 days)
shottr 3,978
Installs (365 days)
shottr 15,131