Galaxy S21 5G vs Galaxy Z Flip6

The Samsung Galaxy S21 5G, released in January 2021, is a traditional slab-style smartphone, offering a familiar and robust design. In contrast, the Samsung Galaxy Z Flip6, launched in July 2024, introduces a clamshell foldable form factor, emphasizing portability and a unique user experience. Both devices operate on the Android platform, but their distinct designs and release timelines lead to notable differences in their capabilities and intended use cases.

The expected practical lifespan of these devices differs significantly due to their respective release dates and software support policies.

• Software Longevity: The Galaxy S21 5G, having been released in early 2021, received its final major Android OS update with Android 15 (One UI 7) in May 2025, and its security updates concluded around January or February 2026. The Galaxy Z Flip6, released in July 2024, benefits from Samsung's extended support policy, promising seven years of major Android OS updates and seven years of security updates, extending its software life considerably further into the future.
• Physical Durability: The Galaxy S21 5G features a glass front with Gorilla Glass Victus, a plastic back, and an aluminum frame, with an IP68 rating for dust and water resistance. The Galaxy Z Flip6, while also featuring an aluminum frame and Gorilla Glass Armor on its outer panels, has a foldable main display made of Ultra Thin Glass and an IP48 rating, offering water resistance and some protection against solid objects larger than 1mm, but not full dust resistance. The folding mechanism introduces a different set of durability considerations compared to a rigid smartphone.

Performance capabilities vary between the two models, primarily influenced by their generational gap and the efficiency of their internal components.

• Processing Power: The Galaxy Z Flip6 incorporates a current-generation processor, which translates to noticeably faster app loading times, smoother multitasking, and more efficient handling of graphically intensive games and demanding applications. The Galaxy S21 5G, with its earlier generation processor, still manages everyday tasks competently but may exhibit slower performance and less fluidity with newer, more resource-intensive applications.
• Battery Behavior: Both devices feature a 4000 mAh battery. The Galaxy Z Flip6, benefiting from a more power-efficient processor and a vapor chamber cooling system, demonstrates improved battery endurance, often lasting over 10 hours in various usage tests and potentially up to two days with lighter use. The Galaxy S21 5G typically offers about 1.5 days of use with a 60Hz display setting, but this can decrease significantly with the 120Hz adaptive refresh rate enabled.
• Multitasking and Storage: Both phones offer ample RAM for smooth multitasking. The Galaxy S21 5G comes with 8GB of RAM and storage options of 128GB or 256GB. The Galaxy Z Flip6 typically offers 8GB or 12GB of RAM and 256GB or 512GB of internal storage, providing more headroom for numerous applications and larger files.

Both smartphones offer vibrant display technologies, but their form factors introduce distinct viewing experiences and practical considerations.

• Display Technology and Clarity: Both the Galaxy S21 5G and the Galaxy Z Flip6 feature Dynamic AMOLED 2X displays, known for deep blacks, high contrast, and vibrant colors. The S21 5G has a 6.2-inch flat display with a resolution of 1080 x 2400 pixels. The Z Flip6 features a 6.7-inch foldable main display with a similar 1080 x 2640 pixel resolution, offering an expansive viewing area when unfolded.
• Refresh Rate and Brightness: Both devices support an adaptive 120Hz refresh rate on their main displays, contributing to smoother scrolling and more fluid animations. The Galaxy Z Flip6's main display can reach a peak brightness of 2600 nits, providing excellent visibility even in bright outdoor conditions. The Galaxy S21 5G offers a peak brightness of 1300 nits, which is also suitable for outdoor use but less intense than the Flip6.
• Unique Display Features: The Galaxy Z Flip6 uniquely features a 3.4-inch Super AMOLED cover display with a 60Hz refresh rate, allowing users to view notifications, widgets, and even run some apps without unfolding the main screen. This secondary screen enhances convenience and quick interactions.

The camera systems on these devices offer different strengths, catering to varied photography preferences.

• Rear Camera Configuration: The Galaxy S21 5G features a versatile triple-camera setup, including a 12 MP wide-angle lens, a 12 MP ultrawide lens, and a 64 MP telephoto lens with 3x hybrid optical zoom. This telephoto lens provides dedicated optical zoom capabilities. The Galaxy Z Flip6 has a dual-camera system, comprising a 50 MP wide-angle main sensor and a 12 MP ultrawide lens. While its main sensor is higher resolution and offers improved low-light performance compared to previous Flip models, it lacks a dedicated telephoto lens.
• Photography Performance: The S21 5G is capable of capturing detailed photos and 8K video, with its telephoto lens excelling in zoomed shots. User opinions on the S21's camera quality are mixed, with some finding it satisfactory and others expressing disappointment compared to other devices. The Z Flip6's 50 MP main camera delivers sharp images with good dynamic range and improved low-light performance, similar to other recent flagship phones. It also offers good video stabilization.
• Front Camera and Audio: Both phones feature a 10 MP front-facing camera for selfies and video calls. The Z Flip6 allows users to utilize the higher-quality main rear camera for selfies by using the cover screen as a viewfinder, a unique advantage of its foldable design. Both devices offer capable speaker output for media consumption.