Galaxy S21 5G • Unlocked vs Galaxy Z Fold5 • Unlocked

The Samsung Galaxy S21 5G, released in January 2021, and the Samsung Galaxy Z Fold5, launched in August 2023, represent distinct approaches to smartphone design within the Android ecosystem. While both devices offer a premium Android experience, the S21 5G is a traditional slab-style smartphone, emphasizing a compact form factor, whereas the Z Fold5 introduces a foldable design that transforms from a conventional smartphone into a tablet-like device. This fundamental difference in form factor dictates many of their core differentiators, from screen size and durability to overall user experience.

The expected lifespan and software support differ significantly between these two devices due to their respective release dates and Samsung's evolving update policies.

• Software Longevity: The Galaxy S21 5G, released in early 2021, launched with Android 11 and was eligible for four major OS updates and five years of security updates. This means it has likely received its last major OS update (Android 15/One UI 7) and will continue to receive quarterly security updates until January 2026. In contrast, the Galaxy Z Fold5, released in mid-2023 with Android 13, is promised four major OS updates and five years of security updates, extending its support well into 2028.
• Physical Durability: The Galaxy S21 5G features a glass front (Gorilla Glass Victus) and a plastic back, with an aluminum frame, offering IP68 dust and water resistance. It received a repairability score of 7.5/10 from one source, noting its ease of disassembly and modular components, though the battery can be difficult to remove. The Galaxy Z Fold5, with its foldable design, uses Gorilla Glass Victus 2 on its cover screen and back, an Armor Aluminum frame, and an Ultra Thin Glass inner display. It carries an IPX8 water resistance rating, meaning it can withstand submersion but lacks official dust resistance. While the Fold5 has shown improved durability over previous foldable generations, concerns about the inner screen's long-term resilience and screen protector peeling have been noted by some users.
• Practical Lifespan: For users prioritizing the latest software features and security patches, the Galaxy Z Fold5 offers a considerably longer period of official support. The S21 5G, while still functional, will see its software support conclude sooner. The physical durability of the Fold5's folding mechanism and inner screen remains a consideration for its overall practical lifespan, though user reports suggest improvements in recent generations.

Performance capabilities are a key differentiator, largely influenced by the generational gap in their internal components.

• Processing Power: The Galaxy S21 5G is powered by a processor that, while capable at its release, is now several generations older. It handles everyday applications and multitasking smoothly, but demanding games and intensive tasks may show signs of slower loading times or reduced frame rates compared to newer devices. The Galaxy Z Fold5 features a more recent, optimized processor designed for high-performance tasks and efficient multitasking across its larger display. This results in faster app launches, smoother transitions, and a more responsive experience, particularly with graphically intensive applications and complex workflows.
• Multitasking and Responsiveness: The S21 5G typically comes with 8GB of RAM, which is sufficient for most daily use, allowing for a reasonable number of apps to be open simultaneously without significant slowdowns. The Z Fold5, equipped with 12GB of RAM, is designed to excel at multitasking, especially when utilizing its large inner screen for multiple applications side-by-side. This increased RAM, combined with its powerful processor, contributes to a highly fluid and responsive user experience, even under heavy load.
• Storage and Battery Behavior: Both devices offer various storage options, with the Z Fold5 generally starting at a higher base storage. The S21 5G has a 4000 mAh battery, which users have reported as providing a full day of moderate use, though heavy usage might require more frequent charging. The Z Fold5 has a 4400 mAh battery, and despite powering two displays, its optimized processor and software contribute to efficient power management, with many users reporting satisfactory battery life for a full day.

The display experience is a primary distinction, driven by the Z Fold5's unique foldable design.

• Display Technology and Clarity: Both devices feature Dynamic AMOLED 2X displays, known for vibrant colors, deep blacks, and excellent contrast. The Galaxy S21 5G has a single 6.2-inch display with a resolution of 1080 x 2400 pixels, providing a sharp and clear viewing experience for a traditional smartphone. The Galaxy Z Fold5 offers a dual-screen setup: a 6.2-inch cover display and a large 7.6-inch foldable inner display. The inner display boasts a higher resolution of 1812 x 2176 pixels, offering a more expansive and immersive canvas for content consumption and productivity.
• Brightness and Refresh Rate: Both phones feature adaptive refresh rates up to 120Hz, ensuring smooth scrolling and fluid animations. The S21 5G's display offers good brightness for outdoor visibility. The Z Fold5's displays also offer high brightness levels, making them comfortable to view in various lighting conditions, including direct sunlight. The adaptive refresh rate on both helps conserve battery life by adjusting based on content.
• Viewing Experience: The S21 5G provides a conventional, comfortable one-handed viewing experience. The Z Fold5's main appeal lies in its large, tablet-like inner screen, which significantly enhances the viewing experience for videos, reading, and multitasking. The cover screen offers a more traditional smartphone experience when the device is folded, though its narrower aspect ratio can feel cramped for some users.

Both devices offer capable camera systems, but the Z Fold5 benefits from newer sensor technology and processing.

• Rear Camera System: The Galaxy S21 5G features a versatile triple-camera setup: a 12 MP main sensor, a 64 MP telephoto lens with 3x hybrid optical zoom, and a 12 MP ultrawide lens. It delivers good image quality in various conditions, with reliable performance for everyday photography. The Galaxy Z Fold5 also has a triple-camera system, consisting of a 50 MP main sensor, a 10 MP telephoto lens with 3x optical zoom, and a 12 MP ultrawide lens. The Fold5's newer sensors and image processing generally result in improved detail, dynamic range, and low-light performance.
• Front-Facing Cameras: The S21 5G has a 10 MP front camera that provides clear selfies and is suitable for video calls. The Z Fold5 features two front cameras: a 10 MP camera on the cover screen and a 4 MP under-display camera on the main foldable screen. While the cover screen camera offers good quality, the under-display camera is primarily designed for video calls and is less suited for high-quality photography due to its lower resolution and placement.
• Video Recording and Audio: Both devices are capable of recording high-resolution video, with the Z Fold5 offering more advanced stabilization and processing. The S21 5G can record up to 8K video. Both phones provide good microphone quality for calls and video recording, and their stereo speakers offer a satisfactory audio experience for media consumption.