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Privacy Policy

Last updated: April 2026

Overview

Quemist (quemist.com) is a free chemistry reference and calculator website. Calculations run entirely in your browser using client-side JavaScript, so no calculation input is transmitted to our servers. The site does, however, use third-party services for analytics and advertising that collect certain data as described below.

Information We Collect

Quemist does not require you to create an account or provide any personal information to use our tools. We do not directly collect, store, or process personal data on our own servers. However, the third-party services we use (described below) may automatically collect certain information, including:

  • IP address (may be truncated or anonymized depending on the service)
  • Browser type and version
  • Operating system
  • Pages visited and time spent on site
  • Referring website
  • Device type (desktop, mobile, tablet)
  • Cookie identifiers

Cookies

Quemist does not set custom first-party cookies. Third-party scripts loaded by this site may set cookies (including first-party cookies on the quemist.com domain) when you visit:

  • Google Analytics sets first-party cookies (e.g., _ga, _ga_*) on the quemist.com domain to distinguish unique visitors and track sessions.
  • Cloudflare may set cookies (e.g., __cf_bm) for security and performance purposes.

Google Analytics

We use Google Analytics 4 (GA4) to understand how visitors use Quemist, including which pages are visited, how long users spend on the site, and general geographic region. Google Analytics collects data through cookies and may process IP addresses. For more information, see Google's Privacy Policy and Google Analytics Opt-Out Browser Add-On.

Advertising

Quemist may display advertisements served by Google AdSense. Google may use cookies and similar technologies to serve ads based on your prior visits to this website or other websites. You can opt out of personalized advertising by visiting Google's Ad Settings. You can also visit aboutads.info to opt out of third-party advertising cookies.

Cloudflare

Quemist is hosted on Cloudflare's infrastructure. Cloudflare may process visitor IP addresses and set cookies for security, performance optimization, and analytics purposes. For more information, see Cloudflare's Privacy Policy.

Legal Basis for Processing (EEA/UK Visitors)

For visitors in the European Economic Area and United Kingdom, the legal basis for processing data through our third-party services is legitimate interest: essential site functionality, security (Cloudflare), and understanding aggregate site usage patterns. You may opt out of analytics and personalized advertising through the links above.

Your Rights

Depending on your location, you may have certain rights regarding your data, including:

  • The right to access information about what data is collected about you
  • The right to request deletion of your data
  • The right to opt out of the sale or sharing of personal information
  • The right to object to processing based on legitimate interest
  • The right to lodge a complaint with your local data protection authority

Because Quemist does not directly collect or store personal data on its own servers, most data subject requests should be directed to the relevant third-party service (Google, Cloudflare) through the links provided above. If you need assistance, contact us at the address below.

California Residents (CCPA)

Under the California Consumer Privacy Act, California residents have the right to know what personal information is collected about them, request deletion of that information, and opt out of the sale or sharing of personal information. The third-party analytics and advertising services described above may constitute "sharing" of personal information under the CCPA. You can opt out of personalized ads using the opt-out links provided in the Advertising section above.

Data Retention

Quemist does not store personal data on its own servers. Data collected by Google Analytics is retained according to Google's data retention settings. Cookie data expires according to the timeframes set by each third-party service.

Children's Privacy (COPPA)

Quemist is an educational chemistry reference site intended for a general audience. The site is not directed at children under the age of 13 as defined by the U.S. Children's Online Privacy Protection Act (COPPA), and we do not knowingly collect personal information from children under 13.

If you are under 13, please do not provide any personal information through this site. If you are a parent or guardian and believe we may have collected information from a child under 13, please contact us at privacy@quemist.com and we will take steps to investigate and, where appropriate, delete such information.

For visitors from the European Economic Area and the United Kingdom, the applicable age of digital consent may be higher than 13 (commonly 16 in many member states). Visitors below the applicable age should use this site only with the involvement of a parent or guardian.

We have configured our third-party advertising and analytics partners (Google AdSense, Google Analytics) in a manner consistent with these principles, including using non-personalized ad settings where appropriate. We do not use the site to build profiles of, or deliver targeted advertising to, individuals whom we know or believe to be under 13.

Third-Party Links

Quemist may contain links to external websites. We are not responsible for the privacy practices of those sites and encourage you to review their privacy policies.

Changes to This Policy

We may update this privacy policy from time to time. Changes will be posted on this page with an updated "Last updated" date. We encourage you to review this policy periodically.

Contact

For privacy-related questions or to exercise your data rights, please contact us at privacy@quemist.com.