responsively

Install command: 
brew install --cask responsively

Name: Responsively

Modified browser that helps in responsive web development

https://responsively.app/

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

Cask code: responsively.rb on GitHub

Current version: 1.16.0

Current version requires: macOS >= 10.15

Versions:

Intel sequoia 1.16.0
sonoma 1.16.0
ventura 1.16.0
monterey 1.16.0
big sur 1.16.0
catalina 1.16.0

Analytics:

Installs (30 days)
responsively 99
Installs (90 days)
responsively 276
Installs (365 days)
responsively 1,261
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