Terms & Conditions

1. Acceptance of Terms

By visiting, accessing, or using duoresponsive.com (the "Service", "Website", or "Platform"), you confirm that you have read, understood, and agreed to be bound by these Terms & Conditions ("Terms"), along with our Privacy Policy. If you do not agree with any part of these terms, you must discontinue your use of the Service immediately.

2. Permitted Use & Purpose

DuoResponsive is an engineering productivity tool engineered to assist software developers, UX/UI designers, quality assurance engineers, and web accessibility researchers. You are granted a limited, non-exclusive, revocable, and non-transferable license to utilize the Service for:

• Testing and inspecting website layout responsiveness, CSS media queries, and viewport segments.
• Simulating dual-screen form factors (such as the iPhone Duo dual-screen display, Microsoft Surface Duo, and foldable Android screens).
• Previewing local staging environments (e.g. localhost) and public production web applications.
• Consulting technical articles, responsive design guides, and device specifications.

3. Simulation Engine & Iframes

The DuoResponsive testing canvas operates by embedding user-specified URLs within isolated browser <iframe> elements configured to model precise hardware resolutions and aspect ratios.

• Third-Party Content Disclaimer: When you input a website URL, you understand that all content, scripts, styles, media, and functionality rendered inside the iframe remain the property and responsibility of that external site. DuoResponsive does not host, curate, or endorse external web content.
• Browser Security Compliance: Modern web standards allow website owners to forbid iframe embedding using headers like X-Frame-Options: SAMEORIGIN or CSP frame-ancestors. We strictly adhere to standard browser security policies and will not bypass legitimate security configurations.

4. Accuracy & Hardware Profiles

While our engineering team expends extensive effort to calibrate viewport dimensions, device pixel ratios (DPR), physical hinge seams (16px), and CSS environment variables to match official hardware specifications:

5. Trademarks & Brand Disclaimer

"Apple", "iPhone", "iPad", "Retina", and "iOS" are registered trademarks of Apple Inc. "Android", "Chrome", and "Google Pixel" are trademarks of Google LLC. "Samsung", "Galaxy", and "Z Fold" are trademarks of Samsung Electronics Co., Ltd. "Microsoft" and "Surface Duo" are trademarks of Microsoft Corporation.

DuoResponsive is an independent project and is not sponsored, endorsed, affiliated with, or officially associated with Apple Inc., Google LLC, Samsung, or Microsoft Corporation. All brand names, model names, and device identifiers are used solely under the doctrine of nominative fair use to identify the hardware specifications simulated by our tool.

6. Intellectual Property Rights

Except for user-submitted URLs and third-party content embedded inside viewports, all materials comprising DuoResponsive — including the proprietary 3D hardware chassis graphics, interactive posture controllers, design systems, algorithms, documentation, and technical articles — are the intellectual property of DuoResponsive and protected by international copyright, trademark, and intellectual property treaties.

7. Prohibited Conduct

You agree not to engage in any of the following unauthorized activities:

• Using the Service to conduct denial-of-service (DoS) attacks, flood requests against third-party endpoints, or test malicious exploits.
• Attempting to bypass our rate limits or systematically scrape our hardware device catalog using automated crawlers without written authorization.
• Framing DuoResponsive itself within phishing domains, scam landers, or misleading marketing schemes.
• Reverse-engineering, decompiling, or attempting to extract proprietary source logic beyond the publicly transmitted client bundle.

8. Disclaimer of Warranties

The Service is provided on an "as is" and "as available" basis without warranties of any kind.

DuoResponsive disclaims all warranties, express or implied, including but not limited to implied warranties of merchantability, fitness for a particular purpose, title, non-infringement, and uninterrupted, error-free operation. We make no warranty that the simulated rendering will match every mobile browser version or that all websites will load without iframe constraints.

9. Limitation of Liability

To the maximum extent permitted by applicable law, in no event shall DuoResponsive, its creators, directors, contributors, or edge network partners be liable for any direct, indirect, incidental, consequential, special, or punitive damages (including loss of profits, data loss, business interruption, or design bugs occurring on production websites tested through our platform), arising out of or in connection with your use of or inability to use the Service.

10. Indemnification

You agree to defend, indemnify, and hold harmless DuoResponsive and its operators from and against any claims, liabilities, damages, judgments, awards, losses, costs, expenses, or fees (including reasonable legal fees) arising out of or relating to your violation of these Terms or your testing of unauthorized third-party websites.

11. Third-Party Websites & Links

Our Website and blog articles may contain links to external third-party resources (such as W3C standards documents, GitHub repositories, or developer documentation). We have no control over the contents or privacy practices of these third-party platforms and accept no responsibility for any loss or damage that may arise from your use of them.

12. Modifications & Termination

We reserve the right to revise or modify these Terms at our discretion. Any revisions will be published on this page with an updated "Last Revised" date. Your continued utilization of DuoResponsive following the publication of revised terms constitutes your acceptance of the changes. We also reserve the right to modify or discontinue any feature of the Service at any time without prior notice.

13. Governing Law & Jurisdiction

These Terms shall be governed by and construed in accordance with the laws of applicable international jurisdiction, without regard to conflict of law principles. Any dispute arising under or relating to these Terms shall be resolved through good-faith negotiation or competent courts of applicable jurisdiction.