Galaxy S21 Ultra 5G Vs Galaxy S23

The Samsung Galaxy S21 Ultra 5G, released in January 2021, and the Samsung Galaxy S23, launched in February 2023, are both high-end Android smartphones from Samsung's flagship Galaxy S series. While both devices offer a premium experience, they differ significantly in their physical size, camera systems, and internal processing capabilities. The S21 Ultra 5G provides a larger display and a more comprehensive camera setup, whereas the S23 focuses on a more compact form factor and enhanced efficiency.

The practical lifespan of a smartphone is influenced by its release timeline and the duration of software support it receives.

• Release Timeline: The Galaxy S21 Ultra 5G was released in January 2021, making it two years older than the Galaxy S23, which launched in February 2023. This age difference impacts their remaining software support. [5]
• OS Support Duration: The Galaxy S21 Ultra 5G typically received four generations of Android OS upgrades and five years of security updates from its launch, with major OS updates likely concluding around Android 15 or 16, and security patches extending into early 2026. [5] In contrast, the Galaxy S23 launched with Android 13 and is promised four major OS upgrades (up to Android 17) and five years of security updates, extending its support until at least 2028. [4, 5]
• Repairability: The Galaxy S21 Ultra 5G received a repairability score of 3 out of 10 from iFixit, indicating challenges due to extensive use of adhesive for components like the battery, display, and rear panel. [5] While specific detailed scores for the base S23 are less widely published, the S23 series generally showed some improvements in repairability compared to previous generations.

Performance in daily use is a key differentiator, influenced by internal components and their efficiency, impacting app loading, multitasking, and overall system responsiveness.

• Storage Options and Speed: Both devices offer various internal storage options. The Galaxy S21 Ultra 5G comes with 128 GB, 256 GB, or 512 GB of storage, utilizing UFS 3.1 technology. [1] The Galaxy S23 also offers 128 GB, 256 GB, or 512 GB options; however, its 256 GB and higher variants utilize newer UFS 4.0 storage, which provides faster read and write speeds compared to the UFS 3.1 found in the S21 Ultra 5G and the 128 GB S23 model. [4, 5] This can result in quicker app installations and file transfers on the higher-capacity S23 models.
• Battery Behavior: The Galaxy S21 Ultra 5G features a 5000 mAh battery, while the Galaxy S23 has a smaller 3900 mAh battery. [1, 2] Despite the smaller capacity, the Galaxy S23 often delivers comparable or even better battery life in typical use cases due to its more power-efficient processor. [10, 27] Users of the S21 Ultra 5G sometimes reported significant battery drain, especially with heavy usage or 5G connectivity. [23, 33] The S23's efficiency means it can often last a full day for many users, with some reporting extended usage. [10]
• Processor Capabilities: The Galaxy S23 offers a notable improvement in processing power and efficiency. This translates to smoother operation, faster app loading, and more consistent performance during demanding tasks like gaming or intensive multitasking. The S21 Ultra 5G provides robust performance for everyday tasks, but the S23 handles sustained workloads with greater ease and less heat generation. [10]

Both smartphones feature Dynamic AMOLED 2X displays, known for their vibrant colors and deep blacks, but they differ in size, resolution, and peak brightness.

• Display Technology and Clarity: The Galaxy S21 Ultra 5G features a larger 6.8-inch display with a higher resolution of 3200 x 1440 pixels, resulting in a pixel density of 515 ppi. [3, 19] The Galaxy S23 has a more compact 6.1-inch display with a resolution of 2340 x 1080 pixels, offering a pixel density of 425 ppi. [2, 30] While the S21 Ultra 5G offers a slightly sharper image, both displays provide excellent clarity for typical viewing. [5]
• Brightness Levels: The Galaxy S23 offers a higher peak brightness of 1750 nits, which can improve outdoor visibility and HDR content viewing, especially in bright conditions. [4, 5] The S21 Ultra 5G has a peak brightness of 1500 nits, which is still bright for most environments. [17]
• Refresh Rate and Smoothness: Both devices feature an adaptive refresh rate of up to 120Hz, providing smooth scrolling and responsive interactions. [3, 4] The S23 can dynamically adjust its refresh rate down to 1Hz for static content, which can contribute to battery efficiency, whereas the S21 Ultra 5G typically operates between 10Hz and 120Hz. [10, 17]

The camera systems on both devices offer versatile photography and videography capabilities, though they approach imaging with different hardware configurations and processing.

• Rear Camera Systems: The Galaxy S21 Ultra 5G features a quad-camera setup, including a 108MP main sensor, a 12MP ultrawide, a 10MP telephoto lens with 3x optical zoom, and a 10MP periscope telephoto lens with 10x optical zoom. [3, 14] The Galaxy S23 has a triple-camera system with a 50MP main sensor, a 12MP ultrawide, and a 10MP telephoto lens with 3x optical zoom. [9, 13] The S21 Ultra 5G offers greater optical zoom versatility with its dual telephoto lenses.
• Low-Light and Everyday Photography: The Galaxy S23 benefits from improved image processing and a more efficient sensor, often resulting in better low-light performance and more natural color reproduction compared to the S21 Ultra 5G. [37] While the S21 Ultra 5G's 108MP sensor captures a high level of detail, the S23's processing can yield sharper and more balanced images in various conditions. [37, 38]
• Video Recording and Front Camera: Both devices are capable of high-resolution video recording, including 8K at up to 30 frames per second on the S23 and 24 frames per second on the S21 Ultra 5G. [14, 37] The S21 Ultra 5G features a 40MP front camera, while the S23 has a 12MP front camera. [1, 9] Despite the lower megapixel count, the S23's front camera often produces more natural tones and improved detail in selfies. [28, 37]