Sizer 2023 (version 13.0) was released on December 22, 2022.
This upgrade to Sizer consisted of bug fixes and minor improvements. Descriptions of these changes are found in Features and Changes.
Version 13.0 updated the program state that it conforms to IBC 2021, however there were no substantial changes when compared with the IBC 2018 which affected Sizer. Version 13.0 still conformed to NDS 2018 and ASCE 7-16, which are also referenced by IBC 2018.
Note that the program was updated to conform to IBC 2024, NDS 2024, and ASCE 7-22 for version 13.2.