Galaxy A55 vs Galaxy S21 5G

The Samsung Galaxy A55 and the Samsung Galaxy S21 5G are distinct smartphones from different segments of Samsung's lineup, released in March 2024 and January 2021, respectively. While the Galaxy A55 represents a modern mid-range offering, the Galaxy S21 5G was a flagship device at its launch. Key differentiators include their release timelines, software support longevity, and the underlying hardware philosophies, with the A55 focusing on current mid-range capabilities and the S21 5G offering older flagship-tier performance.

The practical lifespan of a smartphone is significantly influenced by its release timeline and the manufacturer's software support policy. The Galaxy A55, being a newer device, benefits from an extended support window compared to the older Galaxy S21 5G.

• Release Timeline: The Galaxy A55 was released in March 2024, making it a current-generation device. The Galaxy S21 5G, launched in January 2021, is several years older. This age difference directly impacts the remaining software support and expected practical lifespan of each device.
• OS Support Duration: The Galaxy A55 is promised four major Android OS upgrades and five years of security updates from its release. Given it launched with Android 14, it is expected to receive updates up to Android 18. In contrast, the Galaxy S21 5G, which launched with Android 11, has already received its four major OS updates, concluding with Android 15 in the first half of 2025. Its security updates also concluded around November 2025, meaning it is no longer receiving regular software support.
• Repairability and Longevity: Both devices are designed with modern smartphone construction, featuring glass and aluminum. The Galaxy A55 has Gorilla Glass Victus+ on the front and a glass back, while the Galaxy S21 5G features Gorilla Glass Victus on the front and a plastic back. The S21 5G has an IP68 rating for dust and water resistance, offering slightly better protection than the A55's IP67 rating. Users prioritizing long-term software updates will find the A55 more suitable, while the S21 5G, though older, still offers robust physical durability.

When evaluating performance, both devices offer capabilities suited to their respective market segments, with the Galaxy S21 5G having been a flagship and the Galaxy A55 a contemporary mid-range option.

• Processor Capabilities: The Galaxy S21 5G, with its flagship-tier processor from 2021, delivers strong performance for demanding applications and multitasking. Users often report smooth operation and quick app loading. The Galaxy A55, featuring a newer mid-range processor from 2024, handles everyday tasks efficiently and provides a responsive user experience. While it offers improvements over its predecessors, it may not match the raw processing power of an older flagship for intensive tasks like high-end gaming.
• Multitasking and Storage: Both devices typically come with 8GB of RAM, with some A55 configurations offering 12GB, which aids in smooth multitasking and app switching. The Galaxy A55 supports expandable storage via a microSD card, offering flexibility for users who need more space for media and files. The Galaxy S21 5G does not feature expandable storage.
• Battery Behavior: The Galaxy A55 is equipped with a larger 5000 mAh battery, which generally translates to extended usage times. Users often report being able to get through a full day of moderate to heavy use. The Galaxy S21 5G has a 4000 mAh battery, and while it was considered good at its release, its performance may vary with age and usage patterns. Some users of the S21 5G have noted that battery drain can be quite high with heavy use.

The display is a primary interaction point, and both the Galaxy A55 and Galaxy S21 5G offer high-quality viewing experiences, though with some distinctions.

• Display Technology and Clarity: Both smartphones feature AMOLED display technology, known for vibrant colors and deep blacks. The Galaxy A55 has a 6.6-inch Super AMOLED display, while the Galaxy S21 5G features a 6.2-inch Dynamic AMOLED 2X display. Both offer Full HD+ resolution, providing sharp and clear visuals for everyday content consumption.
• Brightness and Refresh Rate: Both devices support a 120Hz refresh rate, contributing to smoother scrolling and a more fluid visual experience. The Galaxy S21 5G can reach a peak brightness of 1300 nits, while the Galaxy A55 can achieve 1000 nits in high brightness mode. Both brightness levels are generally sufficient for outdoor visibility, though the S21 5G may offer a slight edge in very bright conditions.
• Screen Size and Viewing Experience: The Galaxy A55 offers a larger 6.6-inch display, which can be more immersive for media consumption and productivity tasks. The Galaxy S21 5G's 6.2-inch display provides a more compact form factor, which some users may find easier for one-handed use.

The camera systems on both the Galaxy A55 and Galaxy S21 5G are designed to capture quality images and videos, each with its own strengths.

• Rear Camera System: The Galaxy A55 features a triple rear camera setup with a 50MP main sensor, a 12MP ultrawide, and a 5MP macro lens. It offers improved AI image processing and features like Night Portrait mode. The Galaxy S21 5G also has a triple camera system, consisting of a 12MP main, a 12MP ultrawide, and a 64MP telephoto lens with 3x hybrid optical zoom. The S21 5G's dedicated telephoto lens provides greater versatility for zoomed shots.
• Photography Performance: The A55's main camera is noted for capturing bright, sharp, and color-accurate photos in good lighting, with decent low-light performance. Some users report occasional oversaturation in certain scenarios. The S21 5G's camera system, while older, was a flagship offering, providing excellent detail, accurate colors, and good stabilization, even at higher zoom levels.
• Video Recording and Audio: Both devices are capable of recording 4K video at 30 frames per second with stabilization. The S21 5G also offers 8K video recording. Both phones feature stereo speakers, providing a more immersive audio experience for media consumption. The S21 5G's Pro Video mode offers extensive control over recording settings, including microphone input.