There are multiple ways to determine the version of the app. The version can be determined by going to Login screen or once signed in, on the Setting screen. To find out what the latest version of the app is available, go to the App Store.
The version of the app looks like #.#.#. For example, 3.1.1
Note: The information in parentheses after the version is helpful for developers if there is ever an issue. You may has a version like 3.1.1 (550 v12). This information in parentheses contains the build number as well as potentially another version if the user is part of a special distribution channel.