Galaxy S21+ 5G vs iPhone 15

The expected practical lifespan of a smartphone is influenced by its release timeline, software support, and physical durability. These two devices, being from different release years, offer varying outlooks on longevity.

• Release Timeline and OS Support: The Galaxy S21 Plus 5G, released in January 2021, launched with Android 11 and typically receives four major OS updates, extending its support to Android 15, with security updates until January 2026. The iPhone 15, released in September 2023, launched with iOS 17 and is expected to receive major iOS updates for five to six years, likely supporting it until iOS 22 or 23.
• Software Longevity: Users prioritizing the longest possible software support and access to the latest features will find the iPhone 15 offers a more extended future-proof experience due to its more recent release. The Galaxy S21 Plus 5G is nearing the end of its major OS update cycle.
• Repairability: The iPhone 15 initially received a lower repairability score, but later updates to Apple's repair assistant software improved its score to 7 out of 10, allowing users to install parts from other identical iPhones and calibrate them directly on the device. The Galaxy S21 Plus 5G generally has moderate repairability, with components being replaceable by skilled technicians. Both devices feature IP68 ratings for dust and water resistance, contributing to their overall durability.

Performance is a key differentiator, impacting how smoothly applications run, how quickly tasks are completed, and the overall responsiveness of the user interface.

• Processor Capabilities: The iPhone 15 features a current-generation processor that handles demanding applications and multitasking with notable efficiency, providing a responsive experience for gaming and intensive tasks. The Galaxy S21 Plus 5G, equipped with a powerful processor from its release year, still offers robust performance for everyday use and most demanding applications, though it may show its age in comparison to newer chipsets during very intensive operations.
• System Responsiveness and Multitasking: Both devices offer smooth navigation and quick app loading. The iPhone 15's more recent processor provides a slight edge in sustained high-performance tasks and future application compatibility. The Galaxy S21 Plus 5G, with 8GB of RAM, is well-suited for multitasking, allowing users to switch between multiple applications without significant slowdowns. The iPhone 15 typically comes with 6GB of RAM, which is optimized for iOS to provide efficient multitasking.
• Battery Behavior: The Galaxy S21 Plus 5G has a larger battery capacity, which, combined with its display technology and software optimizations, generally provides a full day of use for many users. The iPhone 15, despite a smaller battery capacity, is optimized for power efficiency, often delivering comparable real-world battery life for typical daily usage.

The display is a primary interface for user interaction, and both devices offer high-quality viewing experiences with distinct characteristics.

• Display Technology and Resolution: The iPhone 15 features a 6.1-inch Super Retina XDR OLED display with a resolution of 2556x1179 pixels, offering deep blacks and vibrant colors. The Galaxy S21 Plus 5G sports a larger 6.7-inch Dynamic AMOLED 2X display with a 2400x1080 pixel resolution, also providing rich colors and excellent contrast.
• Brightness and Outdoor Visibility: The iPhone 15 offers higher peak brightness levels, reaching up to 2000 nits for outdoor use, which enhances visibility in bright sunlight. The Galaxy S21 Plus 5G also provides strong outdoor visibility with a peak brightness of 1300 nits.
• Refresh Rate and Smoothness: The Galaxy S21 Plus 5G features an adaptive 120Hz refresh rate, which results in smoother scrolling and more fluid animations. The iPhone 15 maintains a standard 60Hz refresh rate, which is sufficient for most users but less fluid than a 120Hz display.

Both smartphones offer capable camera systems designed to capture high-quality photos and videos, though with different specifications and features.

• Main Camera System: The iPhone 15 features an advanced dual-camera system with a 48MP main sensor that can capture detailed 24MP photos by default and offers a 2x telephoto option through sensor cropping. It also includes a 12MP ultrawide camera. The Galaxy S21 Plus 5G has a versatile triple-lens system, including a 12MP wide-angle, a 64MP telephoto with 3x hybrid optical zoom, and a 12MP ultrawide camera.
• Photography Performance: The iPhone 15 excels in computational photography, offering features like Photonic Engine and Smart HDR 5 for improved detail and dynamic range, especially in challenging lighting. The Galaxy S21 Plus 5G provides strong low-light performance with its Night Mode and offers a 30x Space Zoom for distant subjects, though digital zoom beyond 3x can lead to reduced detail.
• Video Recording Quality: Both devices are capable of recording high-quality video. The iPhone 15 supports 4K Dolby Vision video recording at up to 60 frames per second and includes Cinematic mode. The Galaxy S21 Plus 5G can record 8K video at 24 frames per second, allowing for high-resolution video snaps, and features Super Steady stabilization for smooth footage.

Beyond core performance and display, several practical elements contribute to the overall user experience and device utility.

• Connectivity and Ports: Both devices support 5G connectivity for fast mobile data. The iPhone 15 features a USB-C port, a significant change from previous models, supporting USB 2.0 transfer speeds. The Galaxy S21 Plus 5G also uses a USB-C port and supports Wi-Fi 6 and Bluetooth 5.0. The iPhone 15 supports Wi-Fi 6 and Bluetooth 5.3.
• Biometric Security: The iPhone 15 relies on Face ID for secure facial recognition. The Galaxy S21 Plus 5G offers both an ultrasonic in-display fingerprint sensor and face recognition for unlocking and authentication.
• Design and Build Materials: The iPhone 15 features a Ceramic Shield front, color-infused glass back, and an aluminum frame, with a weight of 171 grams. The Galaxy S21 Plus 5G has a glass front and back (Gorilla Glass Victus) with an aluminum frame, weighing 200-202 grams. The iPhone 15 is slightly lighter and more compact.