Responsively App

Responsively App is a free, open-source Electron-based browser that streamlines responsive web development. It shows multiple device viewports side-by-side and mirrors interactions across all screens in real time. Capture full-page screenshots with one click, use built-in or custom device profiles, and access a unified inspector with standard browser tools such as cookie and storage management. The app accelerates testing, debugging, and visual QA without physical devices.