It's easy to see the current version of OnForm that you are running. Open the app, and on the HOME screen, tap the "?" icon. At the top of the pop-up menu, you'll see the version number as shown below:
To update to the latest, simply go to the App Store and tap the Update button (you may need to simply search for 'OnForm: Video Analysis'. If you don't see an Update button, you should be on our latest release.