The browser for devs who care about their craft and users

A desktop browser for web devs. Preview viewports side-by-side, audit accessibility, SEO and performance. Built to boost productivity and streamline building and testing.

Try Polypane for free 14 day trial. No credit card needed.

Polypane showing six different panes in one overview, emulating different devices and viewports

Polypane showing the same site in light mode, dark mode, forced color mode and reduced motion. The emulation settings are open showing additional options.

Polypane showing a single site with its landmarks highlighted as well as a focus trail rendered across the page. An opened sidebar shows the heading structure of the page.

Polypane with an opened sidebar showing the meta information of a page: title, description as wel as og tags and other meta data. The top of a social media card preview for Bluesky is visible.

Polypane showing three panes, with a sidebar containing the element inspector. The H1 element that's selected is highlighted in all panes. The sidebar shows the CSS properties and box model of the selected element.

These companies use Polypane

Trusted by developers shipping work that matters.

This thing is FAST and the synchronized scrolling works amazingly. Prepare to be impressed.

Vivian Guillen - Frontend Dev, Curator at Tailwind Weekly

Polypane is really saving my bacon. Kilian knocked it out of the park, this is my new favorite development tool.

Scott Tolinski - Syntax.fm host, Level Up Tutorials

Polypane helped me see a spacing issue between two breakpoints that I wasn’t aware of. Love it 💯

Sara Soueidan - Front-end UI engineer, Speaker/Trainer

I've started playing around with Polypane and 🤯. It has awesome debugging tools, I'm really impressed.

Kevin Powell - CSS Evangelist

Polypane helps you craft sites with care.

A desktop browser purpose-built for modern web developers. From real-time responsive previews to in-depth accessibility and SEO testing, it brings everything you need into one streamlined environment.

Responsive design

Mobile screens to 5K monitors, see all viewports in one overview.

Lint as you go

Check your structure, metadata and accessibility. Get instant suggestions.

Side by side views

Test dark and light and more without changing your system settings.

Comparing workflows

Why devs switch to Polypane

Polypane replaces your patchwork of tools with a single, powerful browser designed for building better websites. Once you try it, you'll never want to go back.

Regular Browsers

Frustration. Inefficiency. Blind spots.

With Polypane

Clarity. Speed. Confidence.

Switching between breakpoints manually

Constantly resizing your window or dragging dev tools around.

Multiple synchronized viewports

See and interact with all breakpoints at once. Build once, preview everywhere.

Slow testing workflow

One screen, one viewport, one change at a time.

Faster iterations

Edit code → changes live across all devices instantly.

Missing accessibility issues

Limited or no built-in accessibility checks.

Built-in accessibility auditing

Instant contrast checks, focus order overview, accessibility features emulation, and more.

Guessing about UX across devices

What your site actually looks like on mobile is a mystery until you test each one individually.

Device realism

Pre-configured panes that match real device resolutions and behaviors.

Over-reliance on extensions

Cramming 10+ dev tools into your browser and still missing insights.

All-in-one power tools

Meta previews, live reloading, image overlays, design & dev tools in one clean interface.

Inconsistent testing environments

You test in your browser and screen size, your teammate tests in another. Everyone sees something else.

Unified testing experience

You all see the same thing: every pane, every breakpoint, every audit. Everyone's on the same page.