The Dell Ultrasharp U2518D is a QHD 25-inch IPS LCD monitor that is good for most usages. It has great ergonomics and a good picture quality, with great peak brightness and good reflection handling, making it a suitable choice for brighter rooms. The monitor supports HDR but you will not gain much advantage from using it in this mode. It has a fast response time and a low input lag to provide a good gaming experience. In darker rooms, blacks look gray and the disappointing black uniformity becomes apparent.
This is a good monitor for mixed usage. It has good resolution for its size and will allow you to see a lot of detail on your screen. The ergonomics are good so you can easily position the monitor comfortably. It has wide viewing angles so those sitting next to you will enjoy a good picture quality and its brightness makes it suitable for rooms with a lot of ambient light.
The Dell Ultrasharp U2518D is a good monitor for office use. It has wide viewing angles encouraging cooperation among colleagues and a good resolution for its size so that you can multitask without issues. The ergonomics are great and you can place the monitor to your preference without trouble. The color gamut is sufficient for most but not for professionals working with photos for publishing. It is bright enough and placing in a bright office should not be an issue.
The Dell U2518D will satisfy most casual gamers. It has a fast response time with a short image trail and a low input lag that makes it responsive. The resolution is good for its size and it will fit most of the details on your screen. Unfortunately, it does not have any advanced gaming features like variable refresh rate or black frame insertion to further improve the gaming experience, and the image only refreshes at 60Hz that is low for advanced gaming.
This is a good monitor for multimedia usage. The QHD resolution is great so you can view your favorite movie or stream most content without losing any detail. The ergonomics are very good thus you can position the monitor comfortably. You need not worry about the picture quality for those who are looking from the side as the monitor will maintain a good picture quality for a decent off center viewing. Unfortunately, this monitor is not suitable for dark rooms as blacks appear gray and the disappointing black uniformity becomes apparent.
Using this monitor for media creation is a good experience. It has a QHD resolution, which for the 25-inch screen size is great and will allow you to multitask easily and be more productive. It has a low input lag and thus it is very responsive and can easily be placed in a room with a lot of ambient light. It can get bright enough to fight glare and has good reflection handling. Unfortunately, it can not display deep uniform blacks and thus you should avoid using it in darker rooms.
This is a decent monitor for HDR gaming. It cannot get bright enough nor does it have a wide color gamut to make all HDR scenes pop. HDR is usually meant to be watched in darker rooms and this can not deliver deep blacks due to its mediocre contrast ratio and sub-par black uniformity. It is, however, a decent entry-level HDR gaming monitor.
This is a typical rectangular plastic Dell stand. It provides good support to the monitor and it is very sturdy.
The ergonomics of the monitor are great. You can easily position the monitor to your liking without any issue. This is typical of most Dell monitors.
The back of the monitor looks very plain. It has an air vent that runs across the top side to provide cooling to the electronics. The stand pole has the typical hole that is Dell's way of providing cable management.
The borders are thin with minimal bezel. However, there is a gap on the screen between the edge and where the pixels start as you can see in the image.
The monitor looks fairly thin without the stand and if VESA mounted, it won't protrude much. When attached to its stand and viewed from the side, the width is pretty much the stands' width.
The build quality of the Dell Ultrasharp U2518D is good. The casing is plastic with no gaps and you should have no issues with it.
The contrast of this Dell U2518D monitor is mediocre. However, this is expected for an IPS monitor. In fact, it is in the middle of the range of IPS monitors we've tested so far.
This monitor does not feature a local dimming option. The video is for reference only.
The SDR peak brightness of the Dell Ultrasharp U2518D is great. The monitor is suitable for bright rooms as it can overcome glare. The brightness is relatively constant at all window sizes and this is good. This is due to the lack of local dimming or frame dimming.
Decent HDR peak brightness. The Dell U2518D can get bright in HDR but unfortunately not enough to give you the entire HDR 'wow' effect.
Decent horizontal viewing angles for the Dell U2518D, typical of an IPS monitor. At a relatively large angle off center, the colors start to shift and just a few degrees later so does the brightness.
Decent vertical viewing angles. Again, colors are the first to shift as we move up from the center axis. Surprisingly when looking from above blacks do shift relatively fast. This might affect the picture quality perceived by someone who looks at the monitor while standing.
The gray uniformity of this Dell Ultrasharp U2518D is great. In the darker shades, there is no visible clouding whereas in the lighter shades you might be able to notice some faint uniformity issues towards the edges that look darker. The good news is that there is almost no dirty screen effect.
Disappointing black uniformity. There is clouding scattered all over the screen and only the corners look uniform. There is backlight bleed around the edges of the screen that can be easily noticed in a dark room.
Excellent out of the box color accuracy. The Picture mode at which we obtained the best results is the 'Standard'.
The color temperature is a little colder than our target of 6500 K, and Gamma does not track too close our target curve, but its average value is close to our 2.2 sRGB target, and the white and color balance dEs are well below the threshold of 3 where most people will notice any color inaccuracies.
The Dell U2518D achieved a remarkable accuracy after calibration. For the calibration, we set Picture mode to 'Custom Color' which is the mode that allows changing the monitor's RGB balance. The white balance dE and color dE are below 0.5, which means that the level of inaccuracy is almost unnoticeable. The gamma curve was corrected to match more closely the target curve and although the overall value is now a bit further from our 2.2 sRGB target the overall result is better. Finally, the color temperature, after calibration, it is much closer to our 6500k target.
You can download our ICC profile calibration here. This is provided for reference only and should not be used, as the calibration values vary per individual unit even for the same model due to manufacturing tolerances.
sRGB Picture Mode: 'Custom Color' (calibrated)
Adobe RGB Picture Mode: 'Custom Color'
Excellent SDR color gamut. The Dell Ultrasharp U2518D covers the sRGB color space adequately. On the other hand, the coverage of the wider Adobe RGB color space is limited and that might be an issue for professional users for editing graphics or print media. If you want a monitor with an even better color gamut, check out the Dell UltraSharp U2520D.
sRGB Picture Mode: 'Custom Color'
Adobe RGB Picture Mode: 'Custom Color'
Excellent SDR color volume. The sRGB in ICtCp color volume is covered adequately except at the darker shades that are limited by the monitor's mediocre contrast ratio. The Adobe RGB in ICtCp color volume is limited both by the monitor contrast ratio and the limited color gamut of the Adobe RGB color space. This might be an issue for professionals in the publishing industry; see our recommendations for the best monitors for photo editing and graphic design.
The Dell U2518D displays a decent color gamut with HDR content. The coverage of the smaller DCI-P3 is ok, but the coverage of the wider Rec.2020 color space is disappointing.
The monitor has a disappointing coverage of HDR color volume due to its limited HDR color gamut and contrast ratio. The monitor can't display vivid colors at a wide range of brightness levels so HDR content won't look much more saturated than SDR content.
This monitor shows no sign of image retention after displaying a high contrast static image for 10 minutes.
Excellent results on our gradient test. The Dell Ultrasharp U2518D displays our gradient test image with almost no banding, as we can see in our test picture. Very minimal banding is visible in the dark part of the colors. As this monitor supports a 10-bit input, no banding generally seen on an 8-bit monitor is visible, and this is excellent.
When displaying large stripes of a single color, no bleeding issues can be seen on this Dell U2518D monitor.
The reflection handling of the Dell U2518D is good. It diffuses direct reflections on the screen using a light matte finish that give them a reddish tint. This is good for an average lit or dark room but in a very bright room, you might find the reflections distracting.
Excellent pixel response time, good enough for fast motion in video games and TV shows. This results in a clear image with only a short trail visible as the photo above shows. You can set the Response Time setting to 'Fast', but you will observe a distracting amount of overshoot and therefore, is not recommended.
The Dell Ultrasharp U2518D has flicker at low brightness settings but the flicker frequency is very high and most people will not notice it.
On the other hand, the monitor lacks a black frame insertion feature to clear up motion, but most 60 Hz monitors don't have this feature because most people find 60 Hz flicker bothersome.
The Dell U2518 has a good refresh rate of 60Hz, but unfortunately, it does not support any advanced gaming features like variable refresh rate.
Update 12/12/2018: We have received reports of this monitor having issues with tearing and stuttering. We have tested the monitor as described here and found the same results. There is a discussion here, if you want to add your comments
The input lag of the U2518D is great, and it does not increase when the monitor is displaying the non-native FHD resolution we tested it on. When in HDR mode the input lag is only slightly higher.