upset is a tool used to create and apply UPS patches, which are binary diffs between two files. It stands out above IPS by being reversible, supporting verification, and enforcing no copier headers or interleave formats for patch application.

This new version is the first application release to use the new phoenix GUI toolkit. As a result, the Windows binary is now a 55KB download, instead of a 2.6MB download when it utilized the Qt toolkit. It can also be compiled natively on Linux for the GTK+ or Qt toolkits.

This version also supports creating new UPS patches, in addition to the previous support for applying them; thus the old tsukuyomi tool is no longer needed nor supported in any way.

This software is released under the ISC license.