The ClearCalcs team are constantly upgrading and improving the platform, and our calculations. Our thorough QA process involves multiple rounds of automated and human testing to ensure the quality of every release, and changes and upgrades are classified and recorded for every new calculation module version.
If you would like to see how a calculator has changed from version to version, you can go into the calculator you are interested in, click 'Details' in the top right of screen, and then click the 'Changelog' button. This will present a summarised list of changes.