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
Detected Version Rev Change Commit
Sep 7, 2023 10:02am 72.2.0 0 VERSION_BUMP 5975369d
Sep 4, 2023 10:49am 72.1.0 0 VERSION_BUMP 55b54e32
Jun 15, 2023 10:24am 71.4.0 0 VERSION_BUMP 3e756fd0
Mar 19, 2023 5:19am 70.6.0 0 VERSION_BUMP 6b0b5d72
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