Polypane

A Chromium-based development browser for building and testing responsive, accessible websites across multiple viewports at once.

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polypane.app

Verified Free tier ~3.3k monthly visits

Quick facts
What is it	A Chromium-based development browser for building and testing responsive, accessible websites across multiple viewports at once.
Pricing	Freemium — from €12/mo
Free tier	Yes
Platform	Desktop Application
Best for	Testing website responsiveness across dozens of screen sizes, Auditing and fixing accessibility issues during development
Domain registered	2019

Data updated Aug. 1, 2026

What does Polypane do?

Polypane is a specialized desktop browser built for web developers. It lets you see your website across many different screen sizes, devices, and user settings all at the same time. Instead of manually resizing your browser window or switching between tabs, you get a single overview with synchronized panes. This means you can scroll, click, or type in one pane, and the action repeats instantly in all the others, making it fast to check how interactions work everywhere.

What sets Polypane apart is its depth of emulation and built-in tooling. It goes beyond simple viewport resizing to emulate touch events, user agents, locale, and system preferences like dark mode or reduced motion. The browser includes over 40 panels and simulators for tasks like checking accessibility, debugging CSS layout, previewing meta tags, and simulating color blindness. A unique feature called Polypane Portal even lets you share your local development site to any external browser or device for real-world testing.

This tool is most useful for professional front-end developers and designers who build responsive websites and applications. It streamlines the process of ensuring a site works well on mobile devices, desktops, and for users with different accessibility needs. Teams can use it to catch visual bugs, verify social media previews, and perform comprehensive cross-browser testing before deployment, all from within their development workflow.

Non-AI Developer Tools — Other

#accessibility testing#cross-browser testing#debugging#responsive design#seo tools#web development

Key features

What makes it stand out

View and interact with multiple screen sizes and breakpoints simultaneously

Emulate devices, user agents, dark mode, and accessibility settings

Over 40 built-in debug tools for accessibility, layout, and meta info

Sync interactions like scrolling and clicks across all open panes

Preview social media cards and meta tags for platforms like X and LinkedIn

Who is Polypane for?

Who benefits most from this tool

Testing website responsiveness across dozens of screen sizes

Auditing and fixing accessibility issues during development

Previewing how social media share cards will look before publishing

Pricing

Free tier available — start without a credit card

Free trial

Free

Full access to the desktop app
No credit card needed
Alone or with your team
Onboarding chat support
On Win, Mac and Linux

Individual

€12.0/month

€9.0/month billed yearly

For one person
Personal and commercial use
Use on 3 personal devices
Full access to the desktop app
Frequent updates
Renewal reminders
Human email support
Pause when needed
Device emulation
Synced interactions
Screenshot editor
Accessibility auditing
Form autofilling
Video recording
Social media previews
Built-in Live reloading
Dark mode testing
Broken link finder
Public localhost sharing
Color picker
Image overlay
Ruler overlays
Horizontal overflow detection
JSON inspector
Multi-session testing
Custom HTTP headers
Color contrast checking

Business

€72.0/month

€54.0/month billed yearly

Everything in Individual, plus:

Full team (10 users included)
Use on 3 computers per user
Full access to the desktop app
All features
Frequent updates
Human email & chat support
Priority feature requests
Manage user access
Centralized billing
Device emulation
Synced interactions
Screenshot editor
Accessibility auditing
Form autofilling
Video recording
Social media previews
Built-in Live reloading
Dark mode testing
Broken link finder
Public localhost sharing
Color picker
Image overlay
Ruler overlays
Horizontal overflow detection
JSON inspector
Multi-session testing
Custom HTTP headers
Color contrast checking

Enterprise

Custom

Everything in Business, plus:

Starts at 20+ users
Use on 3 computers per user
Full access to the desktop app
Frequent updates
Human email & chat support
Priority feature requests
Manage user access
Custom billing options
Single sign-on & SCIM
Training & onboarding
Supplier portal registration
Device emulation
Synced interactions
Screenshot editor
Accessibility auditing
Form autofilling
Video recording
Social media previews
Built-in Live reloading
Dark mode testing
Broken link finder
Public localhost sharing
Color picker
Image overlay
Ruler overlays
Horizontal overflow detection
JSON inspector
Multi-session testing
Custom HTTP headers
Color contrast checking

Trust & presence

Domain Domain registered 2019

Gallery

Click any image to enlarge

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