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onlinecontrastchecker.com
CLIENT-SIDE PRIVACY GUARANTEE

Privacy Policy

Last updated: September 2026. Learn how onlinecontrastchecker.com respects your privacy with a zero-telemetry, zero-backend architecture.

🛡️Our Core Privacy Principle

onlinecontrastchecker.com is built as an entirely client-side web application. All contrast ratio derivations, color conversions, Machado LMS simulations, and auto-adjust computations run directly on your computer inside your web browser. We do not operate user accounts, and we never transmit your color data, design tokens, or browsing activity to remote servers.

1. Information We Do Not Collect

Unlike traditional cloud services and third-party browser plugins, we do not collect:

  • Personally Identifiable Information (PII) such as your name, email address, phone number, or physical address.
  • The colors, hexadecimal codes, or design brand palettes you test using our tools.
  • Uploaded image files, screen pixel coordinates, or sampled eye-dropper data.
  • Tracking cookies, behavioral advertising identifiers, or device fingerprinting profiles.

2. Local Storage and Client-Side Session Data

To enhance your user experience, our application uses modern browser localStorage and URL parameters strictly on your local device:

  • Theme Preference: We save a simple string value ('light' or 'dark') in your browser’s localStorage so the website remembers your preferred visual mode across visits.
  • Recently Audited Pairs: When you test colors, recent pairs are stored in client memory during your active session. This data is never uploaded or shared.
  • URL Parameters: When you modify colors, parameters like ?fg=171717&bg=fafafa are written to your browser's address bar to enable bookmarking and sharing. These values remain on the client unless you choose to share the URL.

3. Third-Party CDN Resources

To render our high-legibility typography, our website loads open-source fonts (Geist, Geist Mono, Inter, and JetBrains Mono) through Google Fonts CDN. Google’s servers receive standard HTTP request headers necessary to deliver font files. For details regarding Google’s privacy practices, please refer to Google’s Privacy Policy.

4. GDPR and CCPA / CPRA Compliance

Under the European Union General Data Protection Regulation (GDPR) and the California Consumer Privacy Act (CCPA/CPRA):

Because onlinecontrastchecker.com does not collect, process, store, sell, or share personal identifying information, there is no personal data to access, rectify, port, or erase from our servers. Your privacy is safeguarded structurally through zero-data architecture.

5. Security of Client Computations

All communication with our website is encrypted using industry-standard Transport Layer Security (TLS/HTTPS). Because our software operates without backend databases or server-side API processing, your proprietary brand colors and unreleased interface designs remain entirely isolated within your local browser sandbox.

6. Contacting Us

If you have any questions, suggestions, or concerns regarding our privacy practices, please contact us via our Contact Us page.