Numerous desktop applications aim to simultaneously display your website at various dimensions, facilitating CSS development and viewport testing. These apps share similarities, including "event mirroring"—actions like scrolling and clicking in one window are replicated across others. Zooming allows viewing multiple scaled-down devices. Let's examine their key differences.

Sizzy

• Platforms: Windows, Mac, Linux
• Pricing: Paid plans starting at $5/month

Sizzy boasts numerous developer-centric features:

• Port killing via command input.
• Universal inspect mode (though DevTools changes aren't universally applied).
• One-click throttling, offline mode, JavaScript disabling, and design mode activation.
• Toggles for image hiding, style disabling, element outlining, and Google Font overrides.

Responsively App

• Platforms: Windows, Mac, Linux
• Pricing: Open source (Free)

Features include:

• Universal inspect mode with correct DevTools context selection.
• SSL validation disabling option.
• One-click dark mode.

Blisk

• Platforms: Windows, Mac
• Pricing: Free (with paid upgrades at $10/month)

Blisk offers:

• Auto-refresh functionality based on file changes.
• Individual DevTools, along with a custom tool for element box model dimensions.
• Custom error reporting.
• "Browsing Mode" for standard browser functionality.

Polypane

• Platforms: Windows, Mac, Linux
• Pricing: Free (with paid plans from $10/month)

Key features:

• Browser extensions for seamless tab transfer.
• Seamless universal inspect mode (changes not universally propagated, but "Live CSS" injects CSS across all devices).
• Breakpoint-based device opening based on CSS.

Duo

• Platform: Mac (Mac App Store, $5)
• Status: Appears inactive; website offline.
• Minimal features: side-by-side, resizable two-column view.

Re:view

• Type: Browser extension (not a standalone app)
• Status: Appears to be an inactive project; "breakpoints" view functionality seems broken.

Conclusion

While Polypane's onboarding is somewhat intrusive, its feature set is the most comprehensive. Sizzy is a strong contender but has a more cluttered interface. Blisk's focus on mobile and larger views aligns with some workflows. Responsively App's open-source nature is appealing, but its long-term sustainability is uncertain. Re:view's browser extension approach is convenient, but its inactive status makes it impractical. Therefore, Polypane emerges as the top choice.

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