Responsive Design Tools
Tools to design and test responsive UIs — preview across devices and study real-page layout references.
alternatives (3)
★ Responsively
Best for: Responsive testing
A dev browser that previews your site across many device sizes at once, with mirrored interactions.
- +Many viewports at once
- +Mirrored actions
- +Free & open
- −Desktop app to install
Visual Reference
Best for: Layout & design inspiration
A gallery of real page and section examples to study how layouts are composed and where elements go.
- +Real-page references
- +Helps plan layouts
- −Reference only
- −no export
Polypane
Best for: Responsive + accessibility
A browser for developers building responsive, accessible sites — side-by-side panes, a11y and meta checks.
- +Multi-pane dev browser
- +Built-in a11y checks
- −Paid
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| Alternative | Does | Best for |
|---|---|---|
| ★Responsively | Multi-viewport preview | Checking responsiveness |
| Visual Reference | Design reference gallery | Studying page layouts |
| Polypane | Dev browser | Responsive + a11y QA |
Tools for building responsive UIs: Responsively and Polypane preview your site across many device sizes at once (Polypane also adds accessibility checks), and Visual Reference is a gallery to study how real pages are laid out before you design yours.