This app does not make the text size to be BIG in all Android apps. What this app does is to make the icon and label that is supposed to launch app to be BIG.For our parents/grandparents or people with bad eye-sight, the Android icons on the Home screens can be too small and too many for them to hunt and tap to launch the app. This app allows you to configure those apps that they commonly use (most likely those apps with BIG text size display for them like Dialer, Calculator etc) and make the icons and label to launch the apps BIG. You will configure for your parents/grandparents and then tell them only need to hunt ONE MakeBigger icon and tap. The screen will then appear to show their commonly used apps icon in BIG size. To launch those apps, just need to tap on the icon or label.For configure, Menu->Add App (set the text size also). Menu->Edit App (set the text size also).The application support English, Simplified Chinese, Traditional Chinese display.