Test your monitor's refresh rate, FPS capability, ghosting, frame skipping, and motion blur with real-time animated UFO diagnostics. Compare 30Hz to 360Hz instantly, for free.
Watch animated UFOs at multiple frame rates simultaneously. Your monitor's refresh rate determines which animations appear smooth.
Every feature you need to fully benchmark your monitor's visual performance and motion capability.
Simultaneously view UFOs moving at 24fps, 30fps, 60fps, 120fps, 144fps, and 240fps. Instantly see which frame rates your monitor handles smoothly.
Core TestIdentify pixel response time trails and ghosting artefacts. See how quickly pixels transition and whether your panel shows visible trailing behind fast objects.
Display QualityDetect dropped and duplicated frames in real time. Frame skipping causes stuttering and uneven motion — our test identifies it precisely.
PerformanceReal-time FPS measurement using high-resolution requestAnimationFrame timing. View current, minimum, maximum, and 1% low FPS values.
Evaluate sample-and-hold motion blur typical of LCD/OLED displays. Lower persistence displays show dramatically less blur at equal refresh rates.
Motion QualityFrame delivery jitter causes micro-stuttering even at high average FPS. Our variance analysis shows how consistent your frame pacing truly is.
AdvancedAutomatically detects your monitor's actual refresh rate using requestAnimationFrame delta averaging, with decimal precision up to 0.1Hz.
Auto DetectReceive an overall smoothness score (0–100) based on FPS stability, jitter, dropped frames, and refresh rate matching for an instant quality grade.
ReportGet accurate results in under 60 seconds — no downloads or plugins required.
Press F11 to enter full-screen mode for the most accurate visual results without browser chrome interference.
Shut down background applications to ensure your GPU renders at maximum capability without CPU-bound throttling.
Select from Multi-Hz, Ghosting, Stutter, Frame Skip, or Motion Blur modes using the control buttons above the canvas.
Observe the animated UFOs at different speeds. Smoother animation at a given Hz indicates your monitor supports that refresh rate.
Monitor FPS, frame time, jitter, and dropped frames in real time. The FPS history chart shows stability over the last 120 frames.
After 5 seconds your Smoothness Score is calculated automatically. A score above 85 indicates excellent monitor performance.
Whether you've just purchased a high-refresh-rate gaming monitor or want to verify your existing display performs as advertised, understanding FPS Tests, FPS measurement, frame rate, and refresh rate is essential for any gamer, content creator, or video professional. This guide explains each concept clearly and shows you how to apply best practices to get the best possible visual experience from your hardware.
A FPS Test is a browser-based visual motion benchmark that renders animated UFO objects moving horizontally across your screen at different, pre-defined frame rates. By comparing the smoothness of each UFO's motion side by side, users can immediately identify the highest frame rate their monitor natively supports. The test is named after its iconic flying saucer graphic and is the most widely used quick-test method for verifying display capability without installing additional software. Our advanced FPS Test extends this classic concept with live FPS counters, ghosting detection, frame skip analysis, and a detailed smoothness scoring system.
An FPS test measures how many individual image frames your system (CPU + GPU combined) generates and your browser renders per second. Higher FPS produces smoother, more responsive motion. For standard desktop use, 60fps is comfortable; competitive gaming demands 144fps or higher; cinematic content typically targets 24fps. Our live FPS counter uses high-precision requestAnimationFrame timing to measure real render intervals in your browser, giving you actual delivery FPS rather than an estimated hardware cap. The 1% low FPS value is especially important — it represents the slowest frames, which determine how "stuttery" motion feels during peak load.
Frame rate (FPS) is the speed at which your computer generates frames. Refresh rate (Hz) is how many times per second your monitor physically redraws its image. While often confused, these are distinct metrics. If your GPU renders at 200fps but your monitor refreshes at 60Hz, you're still seeing only 60 unique frames per second on screen. Technologies like G-Sync, FreeSync, and HDMI 2.1 VRR dynamically synchronise both values to eliminate screen tearing and reduce input latency. Using our FPS Test alongside a refresh rate detector, you can confirm both values independently and identify whether synchronisation is working correctly.
Ghosting appears as a faint, blurry trail following fast-moving objects on your screen. It is caused by slow pixel response time — specifically, the time required for a pixel to transition between colours (Grey-to-Grey or GtG latency). TN panels typically achieve 1ms GtG; IPS and VA panels range from 4ms to 16ms. At 144Hz, a single frame lasts about 7ms, meaning any panel with GtG above this threshold will show visibly overlapping pixel states — ghosting. Our ghosting test mode renders a high-contrast moving object against a uniform background so trailing artefacts become clearly visible. Overdrive settings on your monitor can reduce ghosting but may introduce inverse ghosting (coronas) if set too aggressively.
Frame skipping occurs when one or more frames are dropped entirely during rendering or display delivery, causing an abrupt jump in motion. Unlike low FPS, frame skipping creates uneven cadence — the motion appears to "teleport" rather than flow. Common causes include CPU bottlenecks, driver bugs, PCIe bandwidth limits, and cable signal issues. In gaming, even a brief skip can cost a competitive advantage. Our frame skip test analyses inter-frame intervals statistically to detect outlier frames that exceed 1.5× the expected frame time, flagging them as potential skips.
For the best results: run the test in full-screen mode (F11), disable hardware acceleration in the browser if testing at non-native Hz, ensure your monitor is set to its native refresh rate in display settings, use a DisplayPort cable rather than HDMI where possible for refresh rates above 144Hz, and close background GPU tasks such as screen recorders or video players. Running the test multiple times and averaging results provides a more reliable benchmark than a single short session. Share your smoothness score to compare with others using identical hardware configurations.
A FPS Test renders animated objects at multiple known frame rates simultaneously, allowing you to visually compare motion smoothness. It measures your monitor's effective refresh rate, reveals ghosting and pixel response issues, and confirms whether your browser/GPU is delivering the expected frame rate.
FPS (Frames Per Second) is the rate at which your GPU renders image frames. Hz (Hertz) is the rate at which your monitor physically refreshes its display. For the smoothest experience, these values should match. Technologies like G-Sync and FreeSync synchronise the two dynamically to eliminate screen tearing.
Ghosting is caused by slow pixel response time (GtG latency). When pixels cannot transition fast enough between frames, the previous pixel state remains partially visible, creating a blur trail. This is most noticeable on VA panels and older IPS displays. Reducing your monitor's response time in display settings can help.
Frame skipping occurs when frames are dropped or delivered unevenly. Causes include CPU/GPU bottlenecks, driver issues, background software conflicts, insufficient VRAM, or display cable bandwidth limitations. Even at high average FPS, poor frame pacing (jitter) can make motion feel uneven.
144Hz offers significantly smoother motion and lower perceived input latency compared to 60Hz. The improvement from 60Hz to 144Hz is much more noticeable than from 144Hz to 240Hz. For competitive gaming, 144Hz is the recommended minimum. 240Hz and 360Hz benefit primarily professional esports players where single-frame reaction advantages matter.
Ensure your monitor is set to its maximum refresh rate in Windows Display Settings or macOS System Preferences. Use a DisplayPort 1.4 or HDMI 2.1 cable for high refresh rates. Enable GPU drivers' adaptive sync features. You cannot exceed your monitor's hardware maximum Hz, but you can ensure your system is hitting that maximum by closing background applications and updating GPU drivers.
Motion blur on LCD/OLED monitors is primarily caused by "sample-and-hold" — the display holds each frame steady until the next one arrives, blurring motion to the eye. Black Frame Insertion (BFI) and strobing backlight technologies reduce this by briefly turning the backlight off between frames. Higher refresh rates also reduce perceived blur proportionally.
Browser-based tests using requestAnimationFrame accurately measure the browser's rendering frame rate, which reflects actual on-screen refresh. They are reliable for detecting refresh rate caps, ghosting, and frame timing issues. For GPU benchmarking under gaming load, dedicated applications like 3DMark are more appropriate, but for display-specific testing, browser tools are accurate and convenient.
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