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Introduction
Polypane is a Chromium-powered development browser for professional front-end developers designed to allow you to build, debug, and preview responsive, fast, accessible, and SEO-friendly websites on multiple viewports at the same time: it simultaneously displays any breakpoint from mobile to 5K and synchronizes scrolling, clicking, hovering, and typing, supports full device emulation (user agent, touch events, regions, safe zones, etc.), unlimited viewports, custom breakpoints and presets, and the Polypane Portal, which synchronizes the local development environment to external browsers and real devices in real time; Built-in more than 40 debugging and simulation tools (accessibility audit, layout debugging, colorblind simulation, unified console and element inspector, social media card pixel-level preview, HTML/JSON viewing, form auto-testing, web page performance detection, full-page/overview screenshots, video recording, etc.), providing synchronized element inspection and console, workspace and session save sharing, real-time overloading and design comparison, etc., significantly improving iteration speed and cross-device consistency, supporting a 14-day free trial and no credit card required. An all-in-one development tool that can be used as an alternative to Chrome/Firefox/Safari to uncover cross-breakpoints and accessibility issues and unify team testing experiences.
Screenshot
Function
Polypane is a developer-specific browser for professional web developers that combines responsive previews, device and accessibility simulations, debugging tools, and social card previews into a single interface that displays multiple viewports at the same time, allowing you to quickly identify cross-screen, performance, and accessibility issues during the development phase, and debug and share results locally.
Responsive multi-view port at a glance : Display any number of viewports from mobile to 5K on the same canvas at the same time, eliminating the need to manually adjust windows repeatedly.
Synchronized interactions : Interactions such as scrolling, clicking, hovering, focusing, and input are synchronized in real time across all viewports, "one operation, multiple tests".
Full device simulation : In addition to size, it can also simulate user agents, touch events, locale, safe area inset, etc., providing a test environment close to the real machine.
Rich debugging tools : Provides 40+ debugging and simulation tools (layout debugging, JSON/XML viewing, console, element inspector, overflow detection, etc.) to cover common development pain points.
Accessibility (A11y) support : Built-in contrast checks, focus order overviews, colorblind simulations, accessibility audits, and multiple accessibility simulations help identify accessibility issues early.
Pixel social card previews : Supports real-time deep preview (dark/light mode) of social media sharing cards such as X/Twitter, Facebook, LinkedIn, Slack, Discord, Telegram, Bluesky, Threads, and Google Search.
Unified element inspector with console : Synchronize elements across all viewports with the console to avoid duplicate debugging of each viewport.
Real-time reloading and editing : Supports editing CSS/JS directly in the browser and updating it in real time to improve iteration speed.
Cross-browser and cross-device testing (Polypane Portal) : Synchronize the local environment to external real browsers and devices, and verify interactions and styles on the real machine without tunneling or deployment.
Viewport and breakpoint management : Provides device presets, free scaling, and breakpoint detection to automatically detect CSS breakpoints and help find clearance and layout issues.
Multiple layout modes and workspaces : Supports multiple layout modes, saves and shares workspace configurations, facilitates team collaboration and reuse of common test layouts.
Screenshot and video recording function : Supports full-page screenshots, overview screenshots, visual difference comparison, and video recording, making it easy to record problems and make presentations.
Assisted testing and automation tools : Includes quality assurance tools such as automatic form testing, accessibility simulator, Web Vitals check, and broken link detection.
Efficient developer experience : Chromium kernel-driven, focusing on building rather than browsing, providing faster iteration, clear multi-view feedback, and a check-in process that reduces blind spots.
Trial and community : Offers a 14-day free trial, active user reputation, and a Slack community, and the project is maintained by a one-man team of founders Kilian and continuously updated (Dutch team, self-funded).