Responsively App

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Introduction

Responsively App is a modified browser built with Electron for responsive web development. It shows a page on many devices at once and mirrors user interactions across all of them.

The README lists mirrored interactions, a customisable preview layout, one element inspector for all devices, more than 30 built-in device profiles with custom devices, one-click screenshots on all devices and hot reloading. It runs on macOS, Windows and Linux.

It is free and open source, which makes it a common alternative to paid responsive browsers. Its last release was v1.18.0 in February 2026, with commits continuing.

In the quality loop it supports manual responsive checks during prototyping and development.

The source code is at responsively-org/responsively-app on GitHub under the AGPL-3.0 licence, with about 25,500 stars; the most recent commit was on 3 October 2026.

Features

1. Mirrored interactions: Clicks, scrolls and typing synced.
2. 30+ device profiles: Plus custom devices.
3. Unified inspector: One inspector for all previews.
4. Screenshots: Capture every device at once.
5. Hot reload: Refresh on code changes.

Pros

1. Very popular: About 25,500 GitHub stars.
2. Free to use: Open source under the AGPL-3.0 licence, so the core tool costs nothing to use.
3. Actively maintained: The repository had commits as recent as 3 October 2026.
4. Community: About 25,500 GitHub stars.

Cons

1. Chromium engine: Does not test Safari or Firefox rendering.
2. Manual tool: No automated assertions.

Usage and Links (Example)

Download from responsively.app (or brew install --cask responsively), open your local dev URL and pick the devices to preview.

Resources:

• Responsively App website
• GitHub repository

Pricing

Responsively App is free and open source under the AGPL-3.0 licence.

Recommended for?

1. Developers checking layouts across devices.
2. Not a fit for automated or cross-engine testing.

Conclusion

Responsively App is a free, popular tool for fast responsive checks during development.

On CheckOps, Responsively App is filed under the Prototype & UX testing and End-to-end & functional stages. Related tools listed here include Polypane, Sizzy, Browserling, Chromatic, Percy and BackstopJS. Before choosing, compare them on licence, supported languages and platforms, hosting model, and how well each fits your existing CI pipeline. Facts on this page were checked against the official website, documentation and repository on 11 November 2026; statements the vendor makes about its own product are marked as vendor claims.