One UI

ワンUI / 2018– / Style / Platform Screen Languages

Samsung's design language for Galaxy devices. It cuts the screen at the height a thumb reaches most easily and calls the part above that the viewing area and the part below the interaction area, so titles sit high while buttons, tabs and dialogs are gathered low. Content is collected into containers with heavily rounded corners, the ground is either white or true black, and a single blue carries every accent.

One UI — Armen777444, One UI 7 Device care screen, 2025 — Wikimedia Commons / CC BY 4.0
Armen777444, One UI 7 Device care screen, 2025 — Wikimedia Commons / CC BY 4.0 · CC BY 4.0
One UI — One UI 5 home screen, 2023 — Wikimedia Commons / Public domain
One UI 5 home screen, 2023 — Wikimedia Commons / Public domain
One UI — Paowee, Samsung Internet 27 screen, 2024 — Wikimedia Commons / CC BY-SA 4.0 · © App: Samsung Screenshot: User:Paowee
Paowee, Samsung Internet 27 screen, 2024 — Wikimedia Commons / CC BY-SA 4.0 · CC BY-SA 4.0 · © App: Samsung Screenshot: User:Paowee

At a glance

Visual cues

  • The upper part of the screen holds nothing but a title and open space, with no touchable control in it
  • Text and images are collected into card shaped containers with strongly rounded corners
  • The title bar has only two states, expanded and collapsed, and never rests anywhere in between
  • In the dark theme the ground goes to true black and only the blue accent sits on top of it

Best used for

  • Pulling every control to the lower half of a large phone screen so one thumb can reach all of them
  • Rebuilding a list screen as a set of rounded containers instead of rows divided by rules

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Dictionary entry

Type
Let the title fill the height of the upper area and open a wide gap between it and body text. The collapsed title may be a shorter, different string from the expanded one.
Composition
Split the screen at thumb reach. Keep only the title and open space above, and move everything that is pressed, switched or confirmed below it. Never let the side margins fall under 24dp.
Material
Round corners generously, roughly 12dp to 26dp. Choose one of two grounds, #fafafa or #000000, restrict the accent to a single blue, and bring no other hue onto the screen.
Caution
Putting a pressable control into the viewing area destroys the reason for splitting the screen at all, and what is left is just a layout with a lot of empty space at the top.
Further study
the definition of the area split in the Structure chapter of the One UI Design Guidelines / the rule permitting different wording for an expanded heading and a collapsed one / how One UI borrows Android's colour category mechanism

Related entries

More from Platform Screen Languages

Continue through styles in the same Platform Screen Languages family, prioritised by shared effects.

Browse all Platform Screen Languages entries

Cite this entry

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https://indexstyle.org/styles/one-ui
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[One UI — IndexStyle](https://indexstyle.org/styles/one-ui)
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