Where to read what changed in each update, and the build you are on
Each update of Showcaser comes with a few lines on what changed.
What's new
The first time you open the app after an update, it shows what changed since the version you had: a What's new in Showcaser card over the app, on the iPhone, iPad and Mac alike. Close puts it away. It never appears on a fresh install.
Every release
Open About at the foot of the list (the sidebar on the iPad and Mac; on the Mac, also in the Showcaser menu). Release Notes shows this build (its version, build number and when it was compiled) and every release, newest first. About also holds Features, this Manual (searchable), Keyboard Shortcuts and Legal. See Keyboard shortcuts (KB-4).
Which build you are on
When you ask for help, give the version and build from About, Release Notes. The iPhone, iPad and Mac versions share one count of build numbers.
The same manual ships inside the app. This section as Markdown