You can either use EnglishCentral using an internet browser on your desktop or laptop computer or choose to use the EnglishCentral app for IOS (iPhone) or Android.
If you use the EnglishCentral app you can access all regular learning activities.You only need to go to the web version to schedule your level (up) test lesson. All other things can be done using the app.
More information about the EnglishCentral apps and links to download them can be found in this FAQ article.
To use the desktop/web version of EnglishCentral you only need an internet browser that is ready for HTML5. That is the case for the latest versions of the Chrome and Firefox.
To see what browser and OS you are using, go to WhatIsMyBrowser.com
You can download the newest versions of the preferred browsers here:
For browsers that are not ready for HTML 5 yet (at the moment: Microsoft Edge, Safari) you also need the latest version of Adobe Flash Player.