There are two editions of Active Calculus – Single Variable. The first edition has been available from this site since 2018; its last major update occurred in August 2019. The second edition was published in August 2025. In addition, there is now a Doenet version of the second edition available as of August 2026.
You can learn more about the second edition of AC-Single in this 2025 blog post and find a summary of the differences between the first and second editions on this separate page. For detailed information about the new Doenet version of AC-Single, see this August 2026 blog post. Note that the Doenet version is only available in HTML on the Runestone platform.
Print versions of the 2nd edition of ACS and its corresponding workbooks are available from 619 Wreath.
In addition to the textbooks themselves, we offer a wide range of ancillary materials for instructors. Detailed information regarding each edition can be found through the links in the main menu above, including links to free HTML and PDF versions and for-purchase print copies. The direct links to each edition’s dedicated page are activecalculus.org/acs1e/ and activecalculus.org/acs2e/.
Each text carries a Creative Commons BY-SA license that allows users to clone, fork, and modify the GitHub source, provided they give attribution and share the results of their work freely. The GitHub source points to 2e, and from August 2025 forward, only the 2e source will be updated.
