# One UI

> Generous vertical space, large headlines at the top of every screen, and a low interaction zone at the bottom — designed for one-handed use on tall phones.

- Category: Platform-native
- Era: 2019 – present
- Origin: Samsung Electronics, Android overlay
- Lesson: https://design.dawit.dev/styles/one-ui
- Try it: https://design.dawit.dev/styles/one-ui?style=one-ui

## Where it came from

Samsung announced One UI in November 2018 as the successor to Samsung Experience (itself the successor to TouchWiz), with wide rollout on the Galaxy S10 in 2019. Its primary design insight was that large phone screens are hard to use one-handed: interactive controls moved to the bottom of the screen, and non-interactive content — titles, status, and context — moved to the top. Text sizes are large throughout, reading more like a newspaper than a tight dashboard.

## How to spot it

- Large, bold section headers with generous top padding
- Interaction zone pinned to the bottom third of the screen
- Ample line height and font size throughout
- White card surfaces on light grey page background

## Strengths

- One-handed use on tall phones genuinely works
- Large text improves accessibility
- Clean and uncluttered — minimal chrome

## Weaknesses

- Significant vertical space cost reduces information density
- Too much white space can feel empty on tablet
- Specific to Samsung conventions — may confuse non-Samsung users

## In the wild

- Samsung One UI Settings app
- Samsung Gallery and Contacts apps
- Samsung DeX desktop mode

## Use it when

Android apps targeting Samsung devices, or any mobile-first UI where one-handed reachability matters.

## Related styles
[Material You](https://design.dawit.dev/styles/material-you.md), [Apple HIG](https://design.dawit.dev/styles/apple-hig.md), [Fluent Design](https://design.dawit.dev/styles/fluent.md)