sizzy ☆

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Description:
Tool to simulate responsive designs on multiple devices

Type: Cask | Latest Version: 73.1.0@0 | Tracked Since: Dec 28, 2025

Links: Homepage | @sizzyapp | formulae.brew.sh

Category: Developer tools

Tags: web-development responsive-design testing browser developer-tools

Install: brew install --cask sizzy

About:
Sizzy is a specialized browser for web developers that renders a single URL across multiple simulated devices simultaneously. It provides a unified testing environment to instantly preview responsive layouts and interactions across various screen sizes. This accelerates the debugging and QA process by eliminating the need to manually check each device or browser window.

Key Features:

Real-time synchronized testing across multiple device views
Customizable device presets and screen sizes
Built-in developer tools for debugging
Touch simulation and device orientation controls

Use Cases:

Debugging responsive web designs across breakpoints
Performing cross-device QA before deployment
Demonstrating responsive behavior to clients

Alternatives:

BrowserStack – Sizzy runs locally for faster performance, while BrowserStack offers cloud-based real device testing
Polypane – Similar local multi-pane browser with comparable features

Version History

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