Privacy policy

Plain-English privacy notes

Aquarium Substrate Calculator is a static utility site. The calculator runs in your browser and does not require an account, login, or database record.

This site uses Google Analytics 4 to understand aggregate usage, such as pages viewed, approximate location, device and browser details, referring pages, and calculator interaction events. This helps improve the calculator and measure whether the site is useful.

Analytics storage is denied by default. Google Analytics cookies are only allowed after you choose Accept analytics in the cookie banner. If you reject analytics, that choice is stored in this browser. You can clear site data for this domain to remove the stored choice and show the banner again.

Information you choose to send

If you email the site owner, your message and email address will be used to respond to your request. Do not send sensitive personal information through email.

Affiliate links and ads

This site may later include affiliate links or display advertising below the calculator result. Those partners may use their own cookies, identifiers, or measurement technologies under their own policies.

Contact

Privacy questions can be sent to contact@aquariumsubstrate.com.