Big Font is an Android application developed by Bk Game that allows users to change the font size of their device easily and quickly with just one touch. Its main feature is that it can scale system font size from 1% to over 300%, which means that users can change the text size to very small (20%) or very large (200%) and everything in between.

The app provides a preview of the scaled text before applying the changes, and users can customize the font size scale value according to their preferences. It is easy to use, and users can change the text size smaller or larger with just one touch. Big Font is a free application that falls under the category of Utilities & Tools.

Overall, Big Font is an excellent application for those who have trouble reading small text on their devices. Its ability to change the font size to such a large degree is impressive, and the preview feature helps users to ensure that the text is at the right size for them. The app is easy to use, and the customization options make it a great tool for those who want to personalize their device's text size.