Polypane vs Responsively App
Side-by-side comparison of features, pricing, ratings, and alternatives.
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.
Responsively App is a free, open-source development browser built specifically for responsive web design work. It lets developers view multiple device viewports side by side, with clicks, scrolls, and form inputs performed on one device automatically mirrored across every other device shown, instead of manually resizing a single browser window. The app includes Preview Suits for saving and switching between favorite device combinations, a unified element inspector that works across all visible devices at once, and one-click batch screenshots of every device in view. It also bundles standard browser developer tools, including cookie, local storage, and session storage management.
- 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
- Completely free and open source
- Sees responsive layout across many devices without manual resizing
- Synchronized interactions save time compared to testing each device separately
- Includes standard devtools features like storage inspection alongside responsive testing
- 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
- Desktop app only, not a browser extension for your existing browser
- Smaller community and update cadence than Chrome or Firefox devtools
- Doesn't replace full cross-browser engine testing (WebKit/Gecko differences)
More alternatives & similar tools
Alternatives to Polypane
View all →A free, open-source browser for previewing and testing responsive web layouts across many devices at once.
Alternatives to Responsively App
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The Verdict
AI-generated from listing dataResponsively App is a completely free, open‑source desktop tool focused on multi‑device preview, while Polypane adds built‑in accessibility checks and live reload but requires a paid subscription after a short trial.
Key differences
- •Free vs. freemium pricing model
- •Built‑in accessibility testing (Polypane only)
- •Live code‑reload across viewports (Polypane only)
- •Open‑source vs. closed source
- •Chromium‑only engine vs. engine‑agnostic preview (Polypane cannot test non‑Chromium browsers)
Pricing & value
Responsively App is fully free and open source; Polypane offers only a 14‑day trial then requires payment.
Ease of use / learning curve
Both are desktop apps with similar multi‑viewport UI; no evidence one is significantly easier.
Features & depth
Polypane adds accessibility audits, live reload, and social‑card preview not present in Responsively.
Integrations & ecosystem
Responsively’s open‑source nature allows community extensions; Polypane lists no API or integrations.
Collaboration
Open‑source project can be forked or shared freely; Polypane has no collaboration features mentioned.
Scalability
Responsively’s free model scales to any number of users without licensing limits; Polypane’s paid model may impose limits.
Support & security
Polypane is a commercial product likely offering dedicated support; Responsively relies on community support only.
Choose Polypane if…
Teams that want built‑in accessibility checks, live reload, and are willing to pay for commercial support.
Choose Responsively App if…
Front‑end developers needing free, open‑source multi‑device preview without extra accessibility features.
Common questions
Is there any cost to use Responsively App?
No, Responsively App is free and open source.
Can Polypane test how a site looks in Safari or Firefox?
No, it runs only on Chromium, so it cannot catch Safari‑ or Firefox‑specific rendering bugs.
Does either tool provide accessibility testing out of the box?
Only Polypane includes built‑in accessibility checks such as color contrast and focus order.