Polypane vs SRWare Iron

Polypane is a browser built specifically for web development, showing multiple synchronized viewports side by side so developers and designers can see how a page behaves across phone, tablet, and desktop breakpoints at the same time, instead of resizing one window repeatedly. Every pane reloads together as code changes, and interactions like scrolling or clicking can be mirrored across panes. Beyond responsive previews, Polypane bundles accessibility auditing (contrast checks, focus order, ARIA warnings), SEO and social-preview inspection, and other developer tools that would otherwise require a handful of separate browser extensions. It has been independently built and bootstrapped since 2019.

SRWare Iron is a Chromium‑based web browser that removes many of the default tracking features found in Chrome, offering a cleaner, more private browsing experience. It retains Chrome's speed and compatibility while adding built‑in ad blocking and anti‑fingerprinting measures. The browser is free to use, works across major desktop operating systems, and includes optional extensions for further privacy control. Iron aims to provide a sleek, lightweight interface for users who want speed without sacrificing security.

• Catches responsive and accessibility issues while coding rather than after
• Replaces several separate testing extensions with one tool
• Bootstrapped, independent company not tied to ad or data-sale incentives
• Real device-matched viewport presets

• Strong built‑in privacy features
• Retains full Chrome extension compatibility
• Fast page load times
• Low memory footprint

• Chromium-based only, so it cannot catch Firefox- or Safari-specific rendering bugs
• No permanent free tier, only a 14-day trial
• Another browser window to maintain alongside your daily driver

• Limited official support channels
• Occasional compatibility quirks with newer Chrome features
• Not fully open source