Open Source Alternatives to Sizzy

A web browser for web developers that allows for the simultaneous testing of multiple device breakpoints in a single window. The software provides synchronized scrolling, clicking, and form inputs across various device dimensions, including accurate pixel ratios and user agents. It includes a unified DevTools panel for debugging, a session manager for testing multiple user roles concurrently, and a photo studio mode for creating mockups with device frames. The browser is built on Chromium and supports Chrome extensions. It features project workspaces to save bookmarks and snippets, and a command system for converting colors or searching npm. It is deployed as a desktop application accessed via a user portal for account and billing management.

Whether you want to cut software costs or escape vendor lock-in, these open source alternatives to Sizzy give you an option you fully own. They run locally on your own device, so your data never leaves your machine. This page lists 1 open source alternative to Sizzy. The most popular is Responsively App. It uses the AGPL-3.0 license.