Terms of Service
Last updated: July 19, 2026
Introduction
Welcome to CostUI (“we,” “our,” or “us”). These Terms of Service (“Terms”) govern your use of costui.com and all associated design tools, calculators, and content (collectively, the “Service”). By accessing or using the Service, you agree to these Terms. If you do not agree, please do not use the Service.
Acceptance of Terms
By browsing or using CostUI, you acknowledge that you have read and agree to these Terms and our Privacy Policy. We may update these Terms at any time; continued use after changes means you accept the revised Terms.
Informational Use & Verifying Results
CostUI provides calculators and reference material for general guidance and educational purposes only. Contrast ratios, px/rem conversions, type and spacing scales, color ramps, and aspect-ratio figures are computed from the values you enter using standard formulas, and they may not reflect how your specific design renders, your framework’s defaults, or the full requirements of any accessibility standard. Treat every result as a starting point, and verify anything that matters — especially accessibility and WCAG conformance — with dedicated testing tools and, where appropriate, a qualified professional. The Service is not professional design, accessibility, or legal-compliance advice.
Description of Service
CostUI provides free, browser-based design tools and educational resources, including:
- Color contrast checker
- PX to REM converter
- Type scale generator
- Color shades generator
- Spacing scale generator and aspect ratio calculator
- Educational articles, guides, and references
All tools are provided free of charge. We may modify, suspend, or discontinue any part of the Service at any time.
User Responsibilities
When using our tools and website, you agree to:
- Use the Service in good faith for legitimate design and development purposes
- Provide accurate inputs when using the calculators
- Not attempt to disrupt, overload, or compromise the website
- Not use automated systems to access the tools excessively
- Respect intellectual property rights
- Not use the Service for any unlawful purpose
Tool Accuracy and Disclaimers
We strive for correct formulas, but we cannot guarantee that every result is error-free or suitable for your particular case. Outputs are estimates based on widely used conventions and the figures you provide; actual appearance and accessibility outcomes depend on fonts, rendering, context, and assistive technology. CostUI makes no warranties, express or implied, including implied warranties of merchantability, fitness for a particular purpose, or non-infringement.
Intellectual Property Rights
The text, graphics, tools, and software on this website are the property of CostUI or its content suppliers and are protected by applicable copyright laws. You may use our tools for personal and professional design work, but you may not resell, republish wholesale, reverse engineer, or remove proprietary notices from the site itself.
Privacy and Data
Your use of the Service is also governed by our Privacy Policy. Tool calculations happen in your browser and are not transmitted to us.
Limitation of Liability
In no event shall CostUI or its suppliers be liable for any damages (including, without limitation, loss of data, project costs, or rework) arising out of the use or inability to use the materials or tools on this website, even if we have been advised of the possibility of such damage.
Third-Party Links
We have not reviewed every site linked from CostUI and are not responsible for their contents. A link does not imply endorsement, and use of any linked site is at your own risk.
Governing Law
These Terms are governed by and construed in accordance with the laws of the United States, and you submit to the exclusive jurisdiction of the courts in that jurisdiction.
Contact Information
- By email: support@costui.com
- Via our contact page