We have made Demi Bagby Fit available in every country that Apple App Store and Google Play Store would allow us to. To check if you can access the app, just visit the store on your device, search for "Demi Bagby Fit" and try downloading the app.
You can download Demi Bagby Fit for free, however, to fully access the app you will need to make a purchase. Google Play Store is known to limit in-app purchases for certain locations so if you are an Android user you can check the information they provide about this matter here. Apple users usually have no issues of this nature, however, a similar list regarding Apple services available in different countries can be found here.