Galaxy A05 Vs Galaxy S21 Ultra 5G

The Samsung Galaxy A05 (released October 2023) and the Samsung Galaxy S21 Ultra 5G (released January 2021) represent distinct offerings within Samsung's smartphone lineup. While the Galaxy A05 focuses on delivering essential smartphone functionality, the Galaxy S21 Ultra 5G was designed as a premium flagship, emphasizing advanced features and high-end performance. Both devices operate on the Android platform, providing access to a vast ecosystem of applications and services.

The practical lifespan of a smartphone is influenced by its build quality, software support, and ease of repair. These two models offer different profiles in these areas.

• Software Support: The Galaxy A05, launched with Android 13, is expected to receive two major OS upgrades, bringing it up to Android 15, and four years of security updates, extending support until late 2027. In contrast, the Galaxy S21 Ultra 5G, released with Android 11, was promised four major OS updates and five years of security patches. It received its final major OS update (Android 15) in May 2025, with security updates concluding around February 2026.
• Build Materials: The Galaxy A05 features a glass front with a plastic back and frame, offering a practical and lightweight construction. The Galaxy S21 Ultra 5G boasts a more robust build, incorporating Gorilla Glass Victus on both the front and back, complemented by an aluminum frame, and includes an IP68 rating for dust and water resistance.
• Repairability: The Galaxy S21 Ultra 5G has been noted for its challenging repairability, receiving a score of 3 out of 10 from iFixit, largely due to the extensive use of adhesive for components like the battery, display, and rear panel. While specific repairability scores for the Galaxy A05 are not widely published, its simpler construction with a plastic back may suggest a more straightforward repair process for some components.

Performance capabilities vary significantly between these two devices, catering to different user demands and usage patterns.

• Processing Power: The Galaxy A05 is equipped with an octa-core processor, suitable for everyday tasks such as web browsing, social media, and light applications. Users generally report smooth performance for routine activities. The Galaxy S21 Ultra 5G, featuring a high-end octa-core processor, delivers robust performance capable of handling demanding applications, intensive multitasking, and graphically rich gaming experiences without noticeable slowdowns.
• Memory and Storage: The Galaxy A05 typically comes with 4GB or 6GB of RAM and 64GB or 128GB of internal storage, which can be expanded using a microSD card. This configuration supports essential functions and provides flexibility for media storage. The Galaxy S21 Ultra 5G offers more substantial memory options, with 12GB or 16GB of RAM, and internal storage capacities ranging from 128GB to 512GB, though it does not support microSD card expansion.
• Multitasking and Responsiveness: For users who frequently switch between multiple applications or engage in more intensive tasks, the higher RAM and processing power of the Galaxy S21 Ultra 5G provide a more fluid and responsive experience. The Galaxy A05 is designed for more moderate usage, where its performance is adequate for typical daily smartphone interactions.

The visual experience offered by these two smartphones differs considerably, primarily due to their display technologies and resolutions.

• Display Technology and Resolution: The Galaxy A05 features a large 6.7-inch PLS LCD display with an HD+ resolution (720 x 1600 pixels). This provides clear visuals for general daily tasks, though some users note that small fonts may appear less sharp. The Galaxy S21 Ultra 5G boasts a 6.8-inch Dynamic AMOLED 2X display with a significantly higher WQHD+ resolution (3200 x 1440 pixels), offering exceptional clarity and vibrant colors.
• Brightness and Refresh Rate: The Galaxy A05 operates at a standard 60Hz refresh rate, which is suitable for typical smartphone interactions. The Galaxy S21 Ultra 5G features an adaptive 120Hz refresh rate, providing smoother scrolling and a more fluid visual experience, particularly noticeable during gaming or fast-paced content. Its display also achieves higher brightness levels, enhancing visibility in bright outdoor conditions.
• Viewing Experience: The Galaxy A05 offers a large screen for media consumption and browsing. The Galaxy S21 Ultra 5G's advanced display technology, higher resolution, and adaptive refresh rate combine to deliver a more immersive and detailed viewing experience, making it well-suited for high-quality video playback and detailed content.

The camera systems on these devices are designed for different levels of photographic capability and versatility.

• Rear Camera System: The Galaxy A05 includes a dual rear camera setup, featuring a 50MP primary sensor and a 2MP depth sensor. This configuration is capable of capturing decent photos in well-lit conditions, but its performance in low-light environments is more limited. The Galaxy S21 Ultra 5G is equipped with a comprehensive quad-camera system, including a 108MP main sensor, a 12MP ultrawide lens, and two 10MP telephoto lenses offering 3x and 10x optical zoom capabilities. This setup provides exceptional versatility, strong low-light performance, and advanced zoom functionality.
• Front Camera and Video Recording: For selfies and video calls, the Galaxy A05 has an 8MP front camera. It supports video recording up to 1080p at 30 frames per second (fps), with some sources indicating 60fps for the rear camera. The Galaxy S21 Ultra 5G features a high-resolution 40MP front camera and can record video up to 8K at 24fps or 4K at 60fps, offering superior detail and flexibility for content creation.
• Audio Output: The Galaxy A05 features a single down-firing speaker, providing functional audio output. The Galaxy S21 Ultra 5G offers stereo speakers, enhancing the media consumption experience with richer and more immersive sound.