galen ☆

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Description:
Automated testing of look and feel for responsive websites

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: testing automation selenium responsive-design qa

Install: brew install galen

About:
Galen is a specialized open-source framework for automated testing of the look and feel of responsive websites. It uses a dedicated syntax to define layout specifications and verify element positioning across different screen sizes. Its main value is providing a reliable way to catch visual regressions and ensure UI consistency without manual checking.

Key Features:

Declarative layout specification language
Cross-browser and cross-device testing support
Integrates with Selenium for automation
Generates detailed visual reports
JavaScript test scripting capabilities

Use Cases:

Automated visual regression testing for web applications
Verifying responsive layouts across multiple device viewports
Ensuring UI component alignment and spacing consistency

Alternatives:

Percy – Percy is a managed cloud service, whereas Galen is a self-hosted, open-source framework.
BackstopJS – BackstopJS focuses on visual regression via screenshot comparison, while Galen specializes in layout geometry and positioning logic.

Version History

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