Font Size, by Kunihiro Ando, is an Android utility that extends system-wide text scaling beyond the platform's standard options. The app focuses on changing system font size while letting users preview results, apply changes with a single tap, and access controls from the notification area. It offers customizable increments and a history of previous sizes for precise adjustments. Intended for elderly users, people with visual impairment, presbyopia, and power users who need clearer text or denser displays.

How far can the app scale system text?

The app exposes an extreme scaling range, letting users set system text anywhere from 20% up to 1000% of the original size. That range surpasses the platform's small-to-largest presets and gives measurable control over legibility and information density. The app includes a built-in way to restore the baseline by selecting 100%, so users can experiment with large or small settings and return to the default quickly.

How does it behave across manufacturers and apps?

Compatibility is broad but not universal. The app reports high compatibility with many Android versions and manufacturer skins and can bypass some hardware-imposed font limits. Some third-party apps that hardcode text sizes do not reflect system-wide changes, and extremely large scales can cause layout breakage in certain app screens or system menus, so expect mixed results on heavily customized interfaces.

What permissions does it need and is root required?

The app uses a standard system permission rather than root. It requires the Android permission to modify system settings (Write/Modify System Settings) to apply changes, and it does not require root access. Because it writes system settings, changes take effect immediately across apps that follow system defaults; that behavior is the intended mechanism for applying font-size adjustments.

Who benefits and how are changes managed day-to-day?

Designed for accessibility and power users, the app is useful for people who need larger text or greater screen density. The interface is deliberately minimalist and light on options, and it keeps a history log of previously used sizes so users can switch back without reconfiguring increments. Community feedback highlights the app's simplicity and reliable behavior across a wide set of devices.

A focused accessibility utility with clear limits and community approval

Given the developer's track record producing practical Android utilities and the positive reception from users, the app is a pragmatic choice for anyone who needs wider control over text scale. Note that it adjusts size only; it does not change font style or typeface. Expect trade-offs when unusually large settings interact with apps that do not follow system defaults.