responsively

Install command: 
brew install --cask responsively

Name: Responsively

Modified browser that helps in responsive web development

https://responsively.app/

/api/cask/responsively.json (JSON API)

Cask code on GitHub

Current version: 0.18.0

Analytics:

Installs (30 days)
responsively 236
Installs (90 days)
responsively 884
Installs (365 days)
responsively 2,945
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