Compare KOORUI S2721PM vs ASUS ROG Swift OLED PG27UCDM

Everyday operation is straightforward with a responsive joystick, but manually switching dimming modes and managing color calibration can feel tedious.

The control joystick and logical menus make frequent adjustments quick and intuitive instead of cumbersome.

No firmware version is exposed and there is no practical user firmware-update path, making future bug fixes uncertain.

User-updateable firmware and automatic update support are welcome conveniences for keeping monitor controls current.

There is no USB hub, which is inconvenient for keyboards, peripherals, and laptop-based workflows.

The built-in USB hub keeps keyboards and mice connected to the display and cuts down on cable runs to a desktop PC.

There is no USB-C charging or power delivery, so it cannot charge a connected laptop.

The 90W USB-C connection can carry a laptop's picture, data, and power together. Higher-demand laptops may still need their own charger.

Video connections cover basic PC and console use, but older HDMI, no USB connections, and few office extras hold back its versatility.

DisplayPort 2.1, two HDMI 2.1 inputs, USB-C, and a USB hub give this compact display unusually broad connectivity. Its KVM adds everyday utility.

The panel can become noticeably warm when local dimming is unexpectedly disabled, raising concern during bright prolonged use.

A custom heatsink enables effective passive cooling without relying on a fan, supporting a quiet desktop setup.

The power adapter is external rather than integrated, adding a brick and another cable to manage.

The integrated power supply eliminates a separate external brick, simplifying cabling and desk placement.

Halos can form around subtitles, cursors, and bright objects on black backgrounds. Some viewers find them mild, but they are more obvious in dark scenes.

Individual OLED pixels eliminate the bright halos commonly seen around small highlights and subtitles on zone-lit LCD displays.

Wake is somewhat slow and may flash odd colors; one reported dimming configuration also failed to reapply after a long sleep.

The proximity sensor can blank the screen when you leave and restore it promptly when you return. That makes daily use simpler while reducing unnecessary OLED exposure.

The coating controls reflections, but its relatively aggressive texture can be noticeable up close and may affect off-angle clarity.

The semi-gloss finish preserves a notably clear and vivid image without the grain of some matte coatings. Bright reflections remain an unavoidable compromise.

VRR flicker is generally minimal and is mainly a risk during unusual very-low-frame-rate swings.

Changing frame rates can cause noticeable flicker, especially in dark games. Anti-flicker settings help in some tests but do not reliably remove the problem.

KOORUI’s DIC black-frame insertion produces excellent motion clarity with surprisingly usable brightness. It does require disabling VRR and local dimming.

ELMB improves perceived motion at 120Hz but halves brightness and disables HDR and VRR. It is helpful in particular games rather than a universal setting.

Mini LED dimming can make night scenes noticeably darker than ordinary IPS, but deep blacks and small highlight control still lag stronger VA screens.

Dark-room blacks look almost perfectly inky with no gray backlight haze. Direct lighting can make the QD-OLED panel appear grayish or purplish instead.

Careful bezel assembly helps it avoid looking cheap, but its all-plastic chassis is not particularly luxurious.

The solid materials and sturdy construction feel premium, even if the aggressive exterior details are not universally appealing.

RPGs and visually detailed solo games benefit enormously from luminous highlights, wide color, and strong HDR contrast.

Cinematic games look gorgeous thanks to deep blacks, highlights, and fine detail. A larger 32-inch screen can still feel more absorbing for single-player adventures.

The stand has a space-saving base, though the external power brick adds some clutter to the desk area.

The screen itself is a compact 27 inches, yet its deep, three-legged stand occupies a surprising amount of desk. A monitor arm may be worth considering.

There are no built-in speakers, so external audio is necessary.

There are no integrated speakers. That absence is especially inconvenient when watching shows or using the screen without external audio.

The stand secures firmly during assembly and is a practical base for everyday use.

The sturdy stand holds its position with little to no wobble, even during joystick adjustments.

HDR Auto is the preferred choice; Movie and Game HDR modes can lift blacks and damage contrast. SDR presets also need careful color selection.

Crosshairs, Shadow Boost, and other game tools offer meaningful flexibility, though veteran players may find some automated extras unnecessary.

Response times and strobing make fast play credible, but the screen is not the best choice for the most demanding esports competitors seeking 240Hz or higher.

The 240Hz OLED speed, minimal input lag, and compact view make fast shooters highly responsive. It remains a demanding choice for PCs trying to push 4K frames.

The Fast setting brings response times under control without excessive artifacts; the very fastest setting introduces significant overshoot.

OLED's consistent fast response eliminates the need to juggle LCD-style overdrive levels across refresh rates.

The 2560×1440 panel gives sharp enough text for ordinary desktop work and a good gaming-detail balance on 27 inches. A 4K alternative remains noticeably sharper for text.

Packing 4K into a 27-inch OLED gives games, interface elements, and small text exceptional definition. The extra pixels are especially noticeable next to 1440p OLEDs.

Side views stay comparatively consistent, useful when other people watch or play nearby. A heavy anti-glare coating may still affect some viewing angles.

Wide viewing angles keep color and contrast consistent well off-center, making the image easy to appreciate from different positions.

Text generally looks crisp from a normal desk distance and is comfortable for office tasks. Higher-resolution 4K models still show finer detail.

The exceptionally dense 4K panel gives the monitor some of the cleanest-looking text and game detail available in desktop OLEDs. Fine edges look superb.

A 100×100mm mount is supported, but one test found standard 10mm screws too short; 12mm M4 screws may be needed.

Standard VESA mounting is available and helps free up desk space. ASUS's required adapter bracket adds a small installation step.

The monitor supports PS5 at 1440p/120Hz with VRR in hands-on testing, but HDMI 2.0 prevents 4K/120Hz and limits some Switch 2 HDR combinations. It is more straightforward for PC gaming.

PS5 and Xbox support reaches 4K at 120Hz, with Dolby Vision providing an extra option on Xbox. Console players cannot use the panel's full 240Hz rate.

The fast IPS panel offers steady off-axis color and good motion response, with weaker native blacks than VA rivals.

QD-OLED delivers wonderfully deep blacks, vivid color, and fast pixel transitions. It also retains familiar limitations with ambient lighting and prolonged static content.

A cable pass-through in the stand helps keep basic video and power leads tidy.

Running peripherals through the built-in USB hub reduces desk cable clutter and keeps the computer's ports freer.

Simple packaging uses sturdy, dense foam to protect the screen during shipping.

Cardboard-based packaging avoids polystyrene, an environmentally preferable choice that stands out from typical monitor shipping material.

Switching between HDR and SDR can trigger brightness, color, and local dimming quirks that sometimes need resetting.

Switching into Dolby Vision triggered repeated display blackouts when opening different programs, prompting a move back to standard HDR.

The 200Hz headline is a meaningful upgrade over 60Hz and slightly faster than some close competitors. Some owners drop to 144Hz to avoid visible scanline artifacts in certain modes.

At 240Hz, gameplay is exceptionally smooth without sacrificing 4K sharpness. Reaching that ceiling in demanding games takes a powerful PC.

Moving objects show relatively little trailing, and the strobing mode produces minimal double images when configured well.

Fast-moving objects show little to no ghosting or overshoot. This is a major advantage over many LCD gaming monitors.

Response is good for an IPS gaming display and competes well with similarly priced monitors. Tuning matters because the most aggressive overdrive setting overshoots.

Near-instant OLED transitions keep action crisp from high refresh rates down to slower gameplay. Response performance is a clear strength.

Fast IPS response and effective strobing keep motion relatively clean, making gameplay smoother than slower alternatives. The DIC mode is especially effective at reducing blur.

Rapid motion stays remarkably distinct, with moving objects and fine interface details easier to follow. Clarity remains impressive at lower refresh rates too.

DisplayPort unlocks QHD at 200Hz, while fast response and HDR produce a strong PC gaming experience once settings are tuned.

A high-end PC can make excellent use of the 4K/240Hz panel's sharpness and low latency. More modest graphics hardware will not always reach the top refresh rate.

Height, tilt, swivel, and pivot adjustments are unusually comprehensive for a budget gaming display. Movement is reported as smooth and convenient.

Height, tilt, swivel, and portrait rotation offer a wide adjustment range. Most movements are smooth, though tilt can feel stiff.

Brightness variation across the panel is very low in detailed testing, and the corners show little distracting falloff.

White and dark-gray fields look notably even, with little distracting dirty-screen effect on the tested panel.

The matte finish reduces visible glare well in daylight, although one detailed hands-on test and an owner found its texture or reflection behavior less refined than ideal.

The glossy anti-reflective finish can handle ordinary indoor glare well, but direct lamps and windows remain troublesome. Opinions vary with lighting and where the screen sits.

Quantum-dot color coverage is unusually wide for the price, extending through DCI-P3 and Adobe RGB. Wide gamut is not a substitute for accurate calibration.

The broad DCI-P3 and Adobe RGB coverage supports rich game color and detailed creative visuals. Wide-gamut material looks especially vibrant.

The monitor works well for everyday office tasks thanks to its clear text and adjustable stand, but the lack of USB and KVM functionality limits all-in-one workstation convenience.

High-resolution text, excellent color, USB-C, and KVM make this more useful at work than many gaming displays. Heavy static desktop use remains a less comfortable long-term fit.

The display earns strong marks for its surprising performance at a budget price, especially once HDR and color are configured. Buyers nevertheless report software quirks that can undermine an otherwise impressive panel.

The overall experience earns enthusiastic praise for a rare mix of 4K sharpness, 240Hz speed, and OLED imagery. Price, stand design, and OLED tradeoffs prevent a blanket recommendation.

Input response is extremely quick at gaming refresh rates, with no appreciable delay expected for most players.

Input lag is very low, making games feel immediate and responsive. The monitor is particularly attractive for fast competitive play.

Adaptive refresh works over DisplayPort and HDMI, including PS5 VRR in direct testing. Other sources caution against assuming every console output mode is supported.

Support for major PC and HDMI VRR formats makes the monitor flexible across devices and GPUs. Flicker with sudden frame-rate changes is the main caveat.

The missing KVM switch prevents easy keyboard-and-mouse sharing between computers.

An integrated KVM lets a keyboard and mouse move between a desktop and laptop without constant cable swapping. It's one of the more practical extras.

PIP and PBP are described as useful for displaying more than one input, although other reviewers focus on limited USB-based productivity features.

Picture-in-picture and picture-by-picture modes are available, but DSC restrictions reduce refresh and color options and require manual re-enabling afterward.

Factory settings and several color modes can look too cool, warm, or saturated depending on configuration. Manual calibration improves results, but critical color work needs care.

Factory color is impressively accurate, particularly in the dedicated sRGB mode. Some HDR modes and the default wider gamut require more care for precision.

The 1,152-zone system strengthens HDR depth at a remarkably low price, yet halos, small-object dimming, and occasional mode-reset behavior leave it short of premium implementations.

Per-pixel dimming allows fine control of bright objects against black backgrounds, avoiding the zone-by-zone compromises of typical LCDs.

Shadow enhancement offers some useful adjustment, but stronger settings wash out the screen instead of selectively brightening dark areas.

Shadow Boost makes opponents hiding in dark areas easier to spot without demanding a separate software workaround.

Mini LED dimming significantly improves apparent HDR contrast over ordinary IPS screens, but native IPS contrast is modest and VA competitors render darker blacks.

Pixel-level light control produces outstanding scene depth and contrast, especially in darker rooms. Strong ambient light can diminish that striking effect.

The joystick-driven OSD is fast and intuitively organized, though options are limited and some owners dislike how changing modes affects their image.

The joystick-controlled on-screen menus are responsive and easy to navigate. They also offer plenty of useful display adjustments.

DisplayPort 1.4 is the connection to use for the full 200Hz PC experience. HDMI is limited to a lower refresh rate.

Full 80Gbps DisplayPort 2.1 can deliver uncompressed 4K at 240Hz with compatible hardware, bypassing DSC-related limitations. The visible difference from working DSC is usually small.

Both SDR and HDR are notably bright, with vivid highlights that can dominate a scene. The minimum brightness may be too high for sensitive night-time users, and some owners find bright white transitions uncomfortable.

Brightness works well in typical indoor conditions, especially with the right settings. It cannot sustain the luminance of a bright LCD, and large white areas may look subdued.

The display can gently reduce brightness on extended bright screens, which one owner finds easier on the eyes.

Automatic brightness limiting can make desktop windows change luminance as content shifts. Uniform Brightness largely fixes the distraction but caps maximum output.

Bright highlights and localized backlighting make HDR the clear highlight of this monitor, provided the Auto HDR mode is used. Haloing and inaccurate alternative presets remain compromises.

Rich blacks and intense small highlights give HDR games and movies real impact. Large bright scenes and the compromises between HDR modes keep it short of a flawless presentation.

Variable refresh is supported over both major video connections and helps avoid tearing across a broad gaming frame-rate range.

Broad adaptive-sync support generally keeps frame delivery smooth across different graphics cards. Uneven frame rates can still trigger OLED flicker.

The panel can produce excellent HDR color, brightness, and contrast for the money. SDR out of the box looks less polished and may require work.

Fine details, vivid color, and inky blacks combine into outstanding image quality. The picture is most impressive with room lighting under control.

HDMI 2.0 is the major connection compromise: it cannot drive the panel at its 200Hz maximum or provide 4K/120Hz console output. A separate hands-on test did confirm PS5 VRR at supported lower resolutions.

The high-bandwidth HDMI 2.1 ports make modern PCs and consoles easy to connect. They're especially welcome alongside DisplayPort 2.1.

Mini LED HDR, a fast QHD screen, and wide color coverage deliver unusually strong value at discounted prices. The appeal is less clear when pricing rises toward more fully equipped rivals.

Exceptional performance comes with a high price, and several similar OLEDs are cheaper or larger. The premium is easiest to justify when its particular extras matter.

Warranty terms may vary by region and are not entirely consistent between printed claims and retailer pages; buyers should confirm local coverage.

Three-year burn-in coverage is reassuring where the product's warranty terms confirm it. Coverage details should be checked for the region and SKU, and protection does not eliminate risk.

There is no official Windows OSD control software, leaving owners to use hardware controls or third-party alternatives.

DisplayWidget Center makes adjusting monitor settings from Windows straightforward. Software and firmware controls add convenience beyond the OSD.

Manual RGB and color-mode adjustments can substantially improve grayscale accuracy, but configuring SDR and HDR separately can take patience.

Accurate sRGB modes, gamma options, and HDR controls make fine-tuning flexible. The most accurate preset locks many settings, creating a convenience tradeoff.

The understated, narrow-bezel design looks cleaner than a typical inexpensive gaming monitor, without flashy lighting.

ROG lighting and logo projection lend a bold gamer look, but the large three-legged stand and flashy flourishes divide opinion. Several would trade the styling for a simpler base.

The body uses budget plastic but fits together neatly, and owner feedback on construction is generally positive.

Materials and assembly feel solid and high-end, with the sturdy stand and metal details contributing to a premium impression.

The 27-inch screen is seen as a useful sweet spot for detailed QHD games and ordinary desk work.

The 27-inch format brings unusually high pixel density and suits closer desk viewing. Some people still prefer a 32-inch OLED for a roomier canvas or more immersive games.

Flicker-free backlighting is a useful advantage for sensitive viewers, though minimum screen brightness can be uncomfortable in a dark room.

Blue-light filtering and generally flicker-free operation help comfort, although some filters cannot be combined with Uniform Brightness mode.

Selectable 4:3 and simulated 24.5-inch views give competitive players more control over their preferred playing field.

Individual tested units show little noticeable corner glow or bleed, though the appearance changes when local dimming is off.

OLED Care features include pixel maintenance, logo protection, and a useful proximity sensor. They reduce wear during varied use but cannot make permanent burn-in impossible.

The main owner received a panel without visible dead pixels or backlight bleed, although other units in the discussion showed defects.

A printed sRGB calibration report is supplied, but one tester found that its claim did not match perceptually accurate color.

Very narrow bezel gaps are less likely to collect dust than the wider seams on some competing displays.

4K at 27 inches benefits from careful Windows or application scaling; small text and inconsistent software rendering can complicate otherwise crisp desktop use.

A certified high-bandwidth DisplayPort cable is included, but its roughly one-meter length can be restrictive for separated PC and monitor positions.

OLED's extremely fast transitions deliver a major clarity advantage over LCD screens at comparable refresh rates, even without strobing.

OLED power consumption can exceed a comparable 4K LCD by a wide margin during bright full-screen content, despite modest use in mixed scenes.

Stock differs sharply by region: some sellers have had ample inventory or discounts, while other buyers report no local listings or sell-outs.

Fine horizontal line patterns can appear on saturated static colors, especially near 180Hz. Owners report improvement at 144Hz and sometimes 200Hz, but the defect can be a deal-breaker.

At this pixel density, the colored fringes associated with older QD-OLED monitors become very hard to notice. A few users may still spot artifacts in certain text or window edges.

Tight-fitting bezel seams leave fewer dust-catching gaps than some competing designs.

KOORUI’s own specifications conflict about USB, display brightness terminology, and warranty duration; buyers should verify seller terms.

Fanless operation keeps the monitor silent, avoiding a distraction found on some actively cooled displays.

Dolby Vision is a useful extra for compatible Xbox games and video, supplementing HDR10. One user found switching between programs disruptive enough to disable it.

An owner in the discussion reported losing half the backlight within a week, while others have had satisfactory use. Long-term dependability remains uncertain.

Mechanical assembly is straightforward and requires no screwdriver. Display color calibration, however, can be considerably more complicated.

Generic display drivers work, but absent dedicated tools complicate calibration, settings recovery, and troubleshooting.