Galaxy S21 Ultra

Galaxy S21 Ultra is a phone powered by Android OS and released by Samsung on Friday, January 29, 2021.

Download Blisk application to test the cross-browser compatibility and responsive design on Galaxy S21 Ultra. This phone is ready to use standalone or simultaneously with lots of other popular devices.

Galaxy S21 Ultra
Viewport Size:
412px × 915px
Screen Size:
1080px × 2400px
Device Pixel Ratio:
DPR 2.625

Table of contents:

Overview and Dimensions

Galaxy S21 Ultra was released by Samsung on Friday, January 29, 2021 and is powered by Android OS. By default, the device is shipped with a web browser — Chrome. Device dimensions are 75.6×165.1×8.9 millimeters (2.98×6.5×0.35 inches)1. The device weighs 227 g.

Galaxy S21 Ultra has a Dynamic AMOLED 2X display with a 6.8-inch screen (112.1 cm2, 20:9 aspect ratio), and an approximately 89.8% screen-to-body ratio. The display is a touch screen, meaning that it supports touch events - interactions using a finger or stylus.

1 - Property is displayed as width × height × thickness.

Screen size, Viewport & Pixel Ratio

Galaxy S21 Ultra has a 6.8-inch screen with a screen size (resolution): 1080px × 2400px , 412px × 915px viewport1, and a CSS Pixel Ratio of 2.625.

1 - Property is displayed as width × height.

Screen size (resolution) is the number of physical pixels present on a screen.

Viewport or Viewport size is the number of software pixels (CSS pixels) present on a screen. Usually, viewport size displays as viewport width in pixels to viewport height in pixels.

Device Pixel Ratio (DPR) or CSS Pixel Ratio is the ratio between the physical pixels (screen size or resolution) and CSS pixels (viewport). Depending on device specification, one CSS pixel can equal one or mode physical pixels. Modern devices have screens with high pixel density resulting in the difference between screen size (resolution) and viewport.

Summary:
Screen Size (Resolution) = Viewport size × Device Pixel Ratio.
Viewport size = Screen Size (Resolution) / Device Pixel Ratio.
CSS Pixel Ratio = Screen Size (Resolution) / Viewport size.

Key points for development and testing

Before you start web development or testing, check that the web application supports a responsive viewport by using a viewport meta tag:

You can inspect this tag in the head section of an HTML document on Galaxy S21 Ultra right in the Blisk app. If this viewport tag is missing, the web application will not be responsive and will overflow the screen, hiding the content from users and leading to a bad user experience.

The form factor of the device represents its primary orientation as a portrait. Landscape orientation is popular on Galaxy S21 Ultra as well and should be seriously considered when you develop or test web applications on any mobile.

You also need to consider that the users will manipulate your web application on Galaxy S21 Ultra with a finger and stylus because this device has a touch screen that supports touch events. It is important to remember, that users may interact with multiple fingers (multi-touch) and gestures: single tap, multi-tap, swipe, pinch, stretch, zoom, etc. The users are highly likely to use gestures on small touch screens because of seamless interaction and great user experience.

CSS Media Query

Use the CSS Media Queries below to apply custom CSS properties for Galaxy S21 Ultra and devices with the same screens:

Galaxy S21 Ultra Media Query for min-width:

Galaxy S21 Ultra Media Query for min-height:

Galaxy S21 Ultra Media Query for landscape orientation:

Galaxy S21 Ultra Media Query for portrait orientation:

Galaxy S21 Ultra Media Query with device pixel ratio:

Launch device in Blisk application

Galaxy S21 Ultra is ready to use in the Blisk app, where you can develop web applications and test cross-browser compatibility, use this phone as a standalone device or simultaneously with other devices. Getting started with Blisk...

  1. Download the latest version.
  2. Launch the Developer Mode from the Toolbar (screenshot below).
  3. Click Device Manager (screenshot below).
  4. Select Galaxy S21 Ultra from the list.
  5. Click Launch Devices.

Launch device from Command prompt or Terminal

You can launch Galaxy S21 Ultra in the Blisk app from Command prompt (Windows) or Terminal (macOS or Linux) to develop web applications and test cross-browser compatibility on a standalone device or simultaneously with other devices. Learn more...

  1. Download the latest version.
  2. Launch the Developer Mode from the Toolbar.
  3. Click Menu: Device Set ➜ Share Set.
  4. Select Command and click Next.
  5. Copy the generated command.
  6. Launch Command prompt or Terminal, paste the command, and execute it.

Specification (Summary)

Release DateFriday, January 29, 2021
VendorSamsung
Device Typephone
Operating SystemAndroid
DisplayDynamic AMOLED 2X, 112.1 cm2, 20:9, ~89.8% screen-to-body ratio
Screen Size (Resolution) Width1080px
Screen Size (Resolution) Height2400px
Viewport Width412px
Viewport Height915px
CSS Pixel Ratio2.625
Display Size6.8-inch
Pixels Per Inch515 PPI
Dimensions (mm)75.6 mm × 165.1 mm × 8.9 mm
Dimensions (inch)2.98 inch × 6.5 inch × 0.35 inch
Device Weight227 g
Galaxy S21 Ultra

Galaxy S21 Ultra

is ready to use for
web development, testing, marketing, SEO needs

App for Windows, macOS, Linux

With Blisk app, you can:
  • Develop responsive web applications for mobiles, tablets, and desktops
  • Test cross-browser compatibility for mobiles, tablets, and desktops
  • Test touch events, simulate medium or slow Internet connection
  • Debug and measure performance with Developer Tools