Galaxy A15 Vs Galaxy S21 5G

Galaxy A15
Galaxy A15
Starting at

Refurbished price:£88.00

Versus £169.00 new

See options
Galaxy S21 5G
Galaxy S21 5G
Starting at

Refurbished price:£128.00

Versus £829.00 new

See options

Ratings

The Samsung Galaxy A15 (2024) and the Samsung Galaxy S21 5G (2021) represent two different approaches within the Samsung smartphone ecosystem. While the Galaxy A15 is a contemporary entry-level device designed for modern essentials, the Galaxy S21 5G was a flagship model that introduced high-end features now available in a more accessible format. Both run on Android with Samsung's One UI interface, but they differ significantly in their hardware priorities, with the A15 focusing on battery longevity and the S21 5G emphasizing processing power and display fluidity.

Scores

Durability

Choosing between these devices involves weighing the benefits of a newer release against the robust build quality of a former flagship model.

  • Software Longevity: The Galaxy A15, released in 2024, benefits from Samsung's extended update policy, promising four generations of Android updates and five years of security patches, which keeps the software current until 2029.
  • Support Cycle: The Galaxy S21 5G, launched in 2021, is approaching the end of its official software support window, meaning it will receive fewer future updates compared to the newer A-series model.
  • Build and Repair: While the S21 5G features a more rigid frame and water resistance, the A15 offers a simpler construction that is often more straightforward for basic repairs like screen replacements.

Year of Release

2023

2021

Compatible with latest Update

Yes

Yes

OS

Android

Android

Foldable

No

No

Performance

Performance differences are noticeable when comparing the efficient, modern internals of the A15 with the high-performance capabilities of the S21 5G.

  • Daily Responsiveness: The Galaxy S21 5G handles intensive multitasking and demanding applications with greater ease. Users will notice that apps open almost instantly and switching between a web browser and social media happens without lag.
  • Battery Endurance: The Galaxy A15 features a significantly larger battery capacity. When combined with its power-efficient internals, it easily lasts through a full day of heavy use, often stretching into a second day for moderate users.
  • System Memory: The S21 5G generally includes more system memory, which ensures that background tasks remain active, preventing the phone from slowing down when multiple browser tabs or documents are open simultaneously.

Memory (GB)

4 GB

8 GB

Screen quality

Both smartphones utilise Samsung's renowned display technology, yet they offer distinct visual experiences tailored to different viewing habits.

  • Display Fluidity: The Galaxy S21 5G features a 120Hz refresh rate, which means the screen updates 120 times per second. This results in exceptionally smooth animations and scrolling. The A15 uses a 90Hz rate, which is clear but lacks the ultra-smooth feel of the flagship.
  • Brightness and Clarity: While both use vibrant panels with deep blacks and rich colours, the S21 5G achieves higher peak brightness. This ensures the screen remains perfectly legible even under direct midday sunlight.
  • Size and Ergonomics: The Galaxy A15 provides a larger 6.5-inch screen for immersive video watching, while the S21 5G's 6.2-inch display is more compact and easier to navigate with one hand.

Resolution

1080 x 2340

1080 x 2400

Screen type

Super AMOLED

Dynamic AMOLED 2X

Audiovisual

The camera systems reflect the original market positioning of each device, with the S21 5G offering advanced optics and the A15 focusing on versatile everyday photography.

  • Zoom and Detail: The Galaxy S21 5G includes a dedicated telephoto lens, allowing users to take sharp photos of distant objects. The A15 lacks this hardware, meaning zoomed-in photos rely on digital enlargement which can lose detail.
  • Video Capabilities: For those who enjoy capturing video, the S21 5G offers superior stabilisation. It can record very stable footage even while the user is walking, making it a better tool for capturing memories on the go.
  • Low-Light Performance: The S21 5G's larger sensors allow it to capture clearer, more detailed images in dim environments. Users will find that night-time photos have less noise and more accurate colours compared to the A15.

Main camera

50 megapixels

12 megapixels

Front camera

13 megapixels

10 megapixels

Miscellaneous

Practical features like connectivity and physical design play a significant role in how these devices fit into a user's daily routine.

  • Connectivity and Ports: The Galaxy S21 5G supports faster 5G standards but lacks a headphone jack. The Galaxy A15 retains the traditional 3.5mm audio port, which is a practical feature for those who prefer using wired headphones.
  • Security Features: The S21 5G utilises a fingerprint sensor hidden under the display glass, providing a sleek way to unlock the phone. The A15 uses a physical fingerprint reader integrated into the side power button.
  • Weight and Materials: The A15 is slightly heavier and larger due to its bigger battery, giving it a substantial feel. The S21 5G is lighter and more pocket-friendly with its slim profile and metal-reinforced frame.

Weight

200 g

169 g

Screen size (in)

6.5

6.2

Mobile network

4G

5G

SIM card

Dual Physical SIM

Dual Physical SIM + eSIM

Carrier compatibility

Unlocked

Unlocked

User feedback from various forums highlights the distinct strengths of both models. Owners of the Galaxy S21 5G frequently praise its compact size and premium feel, noting that it still feels like a high-performance device years after its release. However, some users mention that the battery requires more frequent charging as the device ages, especially with the high refresh rate screen active. Conversely, Galaxy A15 users appreciate the exceptional battery life and the modern software experience, though some find the camera performance less impressive in challenging lighting or when trying to capture fast-moving subjects.

Choosing between these two depends on individual priorities. Users who value a compact design, high-end display smoothness, and advanced camera features like optical zoom will find the Galaxy S21 5G better suited to their needs. On the other hand, those who prioritise long-lasting battery life, a larger screen for media, and several years of guaranteed software updates should consider the Galaxy A15. For those seeking the high-end features of the S series in a more sustainable way, a quality-assured refurbished option provides a practical path. Ultimately, the A15 is a reliable choice for longevity and endurance, while the S21 5G remains a powerful tool for those who want flagship-grade performance in a smaller package. Choosing a sustainable choice like a refurbished device ensures these capable electronics continue to serve users effectively.

See all articles

Our recent comparisons