The Dell S2721QS is a great budget 4k monitor that's suitable for a wide range of uses. It has a large screen with plenty of space for multitasking, and its high pixel density results in sharp images and text. The stand allows for a good amount of ergonomic adjustments, and its IPS panel has wide viewing angles, so you can easily share your screen with colleagues. It has a fast response time, low input lag, and supports variable refresh rate (VRR) technology to reduce screen tearing when gaming. The refresh rate is limited to 60hz, but it shouldn't be an issue for most people as gaming in 4k is still quite demanding. Like most IPS panel monitors, the contrast ratio is mediocre, which results in blacks looking grayish in the dark. Additionally, while it gets bright enough to fight glare, it isn't enough to deliver a satisfying HDR experience.
The Dell S2721QS is a great monitor overall. It has a large screen with a 4k resolution, good ergonomics, and wide viewing angles, making it a great choice for nearly any office environment. It has low input lag, a fast response time, and VRR support to provide a good gaming experience. It has full coverage of the sRGB color space, but its color accuracy is just okay out-of-the-box. The contrast ratio is low and there's some backlight bleed, so it isn't ideal for dark rooms.
The Dell S2721QS is great for office use. Its good ergonomics allow you to adjust the screen to your optimal viewing position, and you can easily share your work with colleagues thanks to its wide viewing angles. It handles reflections well and gets bright enough to overcome glare. It has a large screen that provides enough space to have multiple windows opened side-by-side, and a high resolution that results in exceptional text clarity. The contrast ratio is mediocre and there's some backlight bleed, so it isn't the best option if you work in a dark room.
The Dell S2721QS is good for gaming. It has a large screen with a 4k resolution, making it a great choice for playing atmospheric games like RPGs. In addition to its low input lag and fast response time, it has FreeSync support and G-SYNC compatibility to reduce screen tearing. The refresh rate is limited to 60Hz, but it should be okay for most casual gamers. It isn't the best option for gaming in the dark, though, as it has a low contrast ratio that makes blacks look gray.
The Dell S2721QS is great for media consumption. It has a 4k resolution and a large screen to provide an immersive viewing experience. It has wide viewing angles and good ergonomics, making it easier to share content on your screen with others. Unfortunately, it isn't ideal for dark rooms, as its mediocre contrast ratio makes blacks look gray.
The Dell S2721QS is great for content creation. It has a large screen and high resolution, allowing you to see fine details clearly. It has full sRGB coverage and good coverage of the Adobe RGB color space. It has a low contrast ratio that makes blacks look grayish, and there's some backlight bleed, although uniformity can vary between units. It has good ergonomics and wide viewing angles, great for sharing your work with clients and coworkers.
The Dell S2721QS is decent for gaming in HDR. It has low input lag, fast response time, and VRR support to minimize screen tearing. However, it has a low contrast ratio that makes blacks look grayish, lacks local dimming, and doesn't get bright enough in HDR to make highlights pop.
The Dell S2721QS has a simple design and looks almost identical to its bigger sibling, the Dell S3221QS, but with a flat, non-curved screen. It has thin borders that aren't distracting, making it a good option for multi-monitor setups. It doesn't stand out in any way and should fit easily into most settings.
The stand is a mix of metal and plastic. It doesn't take up too much space, and the flat base lets you put things on it. It feels stable and doesn't wobble much.
Good ergonomics. It allows for all manner of adjustments so that you can place the screen at your ideal viewing position.
The back is plain and made of textured plastic. There's a cutout on the stand for cable management and a quick-release feature to remove the stand if you want to VESA-mount it.
The borders are thin on three sides and aren't distracting, making it a good option for multi-monitor setups.
Both the screen and the stand are relatively thin and don't take up much space.
The Dell S2721QS' build quality is good, very similar to the Dell S3221QS. The display is made entirely of good quality plastic. There are no loose parts, and the back doesn't flex much. The stand is a mix of metal and plastic, and it supports the monitor well. The quick-release feature works well and doesn't feel cheap.
The Dell S2721QS has a mediocre contrast ratio; however, it's better than most IPS panels and close to the advertised 1300:1 contrast. That said, blacks still look gray in the dark, and contrast can vary between individual units.
The Dell S2721QS doesn't have a local dimming feature. The video above is provided for reference only.
The Dell S2721QS' SDR peak brightness is great. It's consistent across different content and bright enough to overcome intense glare, so you shouldn't have any visibility issues in well-lit rooms.
We measured the SDR peak brightness after calibration in the 'Custom Color' Picture Mode with Brightness set to max.
The HDR peak brightness is okay. It's again very consistent when displaying different scenes, but it isn't bright enough to deliver a good HDR experience.
We measured the HDR peak brightness using the 'Desktop' Picture Mode in the Smart HDR settings menu.
Update 12/08/2020: We've retested the horizontal viewing angle, as some users have reported that the edge of the screen seems blurrier than the rest when viewed at an angle. This is normal for most monitors since that area is behind the border, but it's a bit more noticeable on this monitor. The score hasn't changed.
The Dell S2721QS has great horizontal viewing angles. Images remain accurate when viewed from the side, good for sharing content on your screen with coworkers and clients.
Great vertical viewing angles. You shouldn't lose any image accuracy unless you mount the monitor far above eye level.
Gray uniformity on our Dell S2721QS is great; however, this can vary between units. The edges are visibly darker, but dirty screen effect is minimal. Uniformity is much better in dark scenes.
Black uniformity is decent, but this can vary between units. The whole screen looks gray/blue, and there's slight backlight bleed along the top and bottom edges. The sides also appear darker than the rest of the screen.
Out of the box, the Dell S2721QS has okay accuracy. There are visible inaccuracies with most colors and shades of gray. The color temperature is on the cooler side, resulting in a slight blueish tint. Gamma doesn't follow the sRGB curve at all, causing most scenes to appear darker than they should. Note that color accuracy can vary between units.
After calibration, accuracy is exceptional. The remaining color inaccuracies shouldn't be visible to the naked eye. The color temperature is almost right on our 6500K target, and white balance is nearly perfect. Gamma is significantly improved, but very dark and very bright scenes are slightly over-brightened.
You can download our ICC profile calibration here. This is provided for reference only and shouldn't be used, as the calibration values vary per individual unit due to manufacturing tolerances, even for the same model.
The Dell S2721QS has an outstanding SDR color gamut. It has full coverage of the sRGB color space used in most content and very good coverage of the Adobe RGB color space used mostly for photo editing.
Outstanding SDR color volume. It has difficulty displaying dark colors due to its low contrast ratio.
Decent HDR color gamut. It has great coverage of the DCI P3 color space used in most HDR content, but its coverage of the wider Rec. 2020 is mediocre.
Our measurement of the DCI P3 coverage is likely lower than other reviewers, which is due to the way we measure it. We measure DCI P3 by sending a Rec. 2020 signal, but unlike most reviewers, we limit the colors to the P3 primaries. This results in a lower but arguably more accurate measurement.
The HDR color volume is just okay. It struggles with dark, saturated colors due to its low contrast ratio, and it also has trouble with bright blues, although that's typical for LCDs.
There's a tiny amount of image retention after exposing a high-contrast image for ten minutes; however, it dissipates quickly. Note that image retention can vary between individual units.
The Dell S2721QS has superb gradient handling. You shouldn't see any banding in most content.
There are no signs of color bleed on this monitor.
Good reflection handling. It has a matte anti-reflective coating that reduces the intensity of reflected lights. Combined with the screen's great peak brightness, you shouldn't have any visibility issues in well-lit environments.
The Dell S2721QS has exceptional text clarity due to its high pixel density. Windows ClearType makes the letters look bolder (top photo), but it might not be necessary.
|Overdrive Setting||Response Time Chart||Response Time Tables||Motion Blur Photo|
The Dell S2721QS has good response time at its max refresh rate, resulting in only a short blur trail behind fast-moving objects. We recommend using the 'Normal' overdrive setting, as it provides the best performance with no overshoot at all.
The backlight is flicker-free, which helps minimize motion duplication and reduce eye strain.
This monitor doesn't have a Black Frame Insertion feature.
The Dell S2721QS supports FreeSync natively to reduce screen tearing when gaming, and it works with G-SYNC as well even though it isn't officially certified by NVIDIA. However, both FreeSync and G-SYNC only work over a DisplayPort connection, not HDMI.
The Dell S2721QS has excellent low input lag, providing a responsive desktop and gaming experience. It remains low with 10-bit HDR or VRR enabled.
The Dell S2721QS's resolution and screen size are outstanding for work, media consumption, and gaming. There's plenty of screen real estate to have multiple windows opened side-by-side, and the high pixel density makes images and text look incredibly sharp.
There aren't many additional features on this monitor, only a Picture-in-Picture and Picture-by-Picture mode, allowing you to display images from two input sources simultaneously.
You can find the controls on the right underside of the screen. There are five buttons, and they allow you to power the monitor On/Off and navigate the on-screen menu.
We tested the 27 inch Dell S2721QS. We have also tested its bigger sibling, the Dell S3221QS; however, it has a curved VA panel and different performance. There are many monitors in Dell's S Series lineup with various configurations, some of which you can see in the table below.
|Model||Size||Panel Type||Resolution||Refresh Rate|
|S2721QS||27"||IPS||3840 x 2160||60Hz|
|S3221QS||32"||VA||3840 x 2160||60Hz|
|S2721D||27"||IPS||2560 x 1440||75Hz|
|S2721H||27"||IPS||1920 x 1080||75Hz|
If someone comes across a different type of panel or if their Dell S2721QS doesn't correspond to our review, let us know, and we'll update the review. Note that some tests, such as gray uniformity, may vary between individual units.
Our unit of the Dell S2721QS was manufactured in July 2020; you can see the label here.
The Dell S2721QS is a great budget-friendly monitor that's suitable for work, media consumption, and gaming. However, it has a mediocre contrast ratio and doesn't get bright enough for HDR. For more options, check out our recommendations for the best 4k monitors, the best office monitors, and the best budget monitors.
The Dell S2721QS is a bit better than the Dell UltraSharp U2720Q for most uses. The S2721QS has higher peak brightness and better reflection handling, and it supports variable refresh rate technology to reduce screen tearing when gaming. However, the U2720Q has better ergonomics and more connectivity options, including a USB-C port that supports DisplayPort Alt Mode.
Overall, the Dell S2721QS is much better than the Dell S3221QS. Although they look similar, the S2721 has wider viewing angles, significantly better ergonomics, and gets brighter in SDR mode. However, the S3221QS' VA panel has a higher contrast ratio and is better suited for dark rooms, and its larger screen size provides more space for multitasking.
Overall, the Dell S2721QS is marginally better than the Dell S2721DGF; however, they're intended for different uses. The S2721QS is a 4k monitor with a basic 60Hz panel while the S2721DGF is a gaming monitor with a 1440p resolution and a 165Hz refresh rate. The S2721QS delivers sharper text and has better color accuracy out of the box. The S2721DGF has better ergonomics, faster response time, and lower input lag.
The Dell S2721QS is much better than the BenQ EL2870U. The Dell has much better ergonomics, higher peak brightness, and its IPS panel has wider viewing angles. It also has a better contrast ratio and can display a wide color gamut for HDR content. On the flip side, the BenQ has better color accuracy out of the box.
The Dell S2721QS and the Lenovo ThinkVision M14 are both office monitors meant for different uses. While the Lenovo is a portable monitor with a 14 inch screen and 1080p resolution, the Dell is a stationary model with a 27 inch, 4k screen. Despite the differences in size and resolution, they have similar pixel density, so text looks sharp on each. The Dell is more versatile because it gets brighter, has better reflection handling, and supports HDR, but the Lenovo is to be used on the go anyways.