Hardware V-Sync Synchronized

Real-Time Monitor Frequency

Detected Screen Refresh Rate

Measuring...

--- Hz

Calibrating V-Sync... Raw: — Hz

Live FPS

— FPS

Instantaneous render

Frame Interval

— ms

Expected: — ms

Frame Jitter

±0.00 ms

Consistency index

Frames Sampled

0 frames

Sliding 180-frame window

Live Frame Time Oscilloscope (Last 120 Frames) Green = Target Median • Amber/Red = Frame Spikes

🛸 Motion Test

Motion Blur & Ghosting Visualizer

Track the moving starships with your eyes. Compare persistence motion blur and trailing across 3 frame rate divisions.

✓ 100% Native Hz (Top Lane)

Smooth, single-image rendering. Clean edges reveal your panel's true pixel response time (GtG).

⚠️ 50% Half Rate (Middle Lane)

Double-imaging appears. Simulates 72 FPS on a 144Hz screen or 30 FPS on a 60Hz screen.

❌ 25% Quarter Rate (Bottom Lane)

Severe stroboscopic stepping and heavy motion judder from low frame refresh updates.

Hardware Profile

System Display & Graphics Specifications

🖥️

Physical Resolution — Monitor pixel bounds

Viewport Resolution — Window canvas area

Pixel Ratio (DPI) — 100% scale

Color Depth — Millions of colors

GPU Acceleration / WebGL Renderer: Detecting graphics adapter...

How to Enable Maximum Refresh Rate (144Hz, 240Hz, 360Hz)

If your monitor is rated for 120Hz, 144Hz, 165Hz, or higher but the test only detects 60Hz, follow these quick operating system guides:

🪟 Windows 10 & Windows 11

Right-click anywhere on your desktop and select Display settings.
Scroll down and click on Advanced display.
Under Choose a refresh rate, click the dropdown menu and select your maximum frequency (e.g., 144 Hz or 240 Hz).
If higher options are missing, ensure your cable is plugged directly into your dedicated GPU (not the motherboard port).

🍏 macOS (MacBook, iMac & Mac Studio)

Open the Apple menu () in the top-left corner and click System Settings.
Click Displays in the left sidebar.
Select your display or external monitor thumbnail at the top.
Click the Refresh Rate dropdown and choose ProMotion (120Hz) or your monitor's highest supported frequency.

Display Cable & Port Compatibility Matrix

Cable / Port Standard	1080p Max Refresh Rate	1440p (2K) Max Refresh Rate	4K (2160p) Max Refresh Rate
HDMI 1.4	Up to 144Hz (selective)	60Hz capped	30Hz capped
HDMI 2.0	240Hz	144Hz	60Hz
HDMI 2.1	360Hz+	240Hz	120Hz – 144Hz
DisplayPort 1.4	360Hz	240Hz	144Hz (with DSC)
DisplayPort 2.1	540Hz	480Hz	240Hz uncompressed

🛡️ 100% Client-Side • Instant & Auto-Saved Locally

Screen Refresh Rate Test — Check Your Monitor Hz & FPS

🎯 Benchmarks

Measure your monitor's true hardware refresh rate (Hz), live frame rate (FPS), and frame pacing down to the microsecond. Test motion blur and ghosting across multiple frame rates.

⭐ 4.9/5 (188 votes)

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Understanding Monitor Refresh Rates: 60Hz vs 144Hz vs 240Hz vs 360Hz

The refresh rate of your screen represents how frequently the panel reads the frame buffer from your display controller and updates the physical crystal gates or OLED diodes. Higher refresh rates drastically reduce input latency, eliminate mouse stutter, and produce crystal-clear motion clarity during fast-paced competitive gaming.

60 60 Hz (16.67 ms/frame)

Standard baseline for office productivity and budget laptops. Noticeable pointer trailing and frame persistence blur during rapid mouse flicking.

144 144 Hz (6.94 ms/frame)

The sweet spot for esports gaming. Cuts frame latency by more than 58%, yielding an instantly noticeable leap in fluid cursor tracking.

240 240 Hz+ (4.17 ms/frame)

Tournament-grade competitive tier. Near-zero motion judder, giving professional FPS athletes maximum tracking precision during micro-flicks.

Frequently Asked Questions

Quick answers about controls, features, accuracy, and local browser saving.

Why does my 144Hz or 240Hz gaming monitor only show 60Hz in this test?

The most common cause is that Windows or macOS has defaulted your display output to 60Hz. Even if your physical panel supports 144Hz, 165Hz, or 240Hz, you must explicitly enable the higher refresh rate in your operating system display settings. Additionally, verify that you are connected via DisplayPort 1.4+ or HDMI 2.0/2.1, as older HDMI 1.4 cables are hardware-bandwidth limited to 60Hz at 1080p or 1440p.

How does this browser-based refresh rate test work?

This test leverages the browser's high-precision requestAnimationFrame rendering pipeline synchronized to your monitor's vertical blanking interval (V-Sync). By calculating the microsecond delta time between consecutive frame presentations using performance.now(), our engine accurately derives your panel's native refresh rate and frame delivery pacing.

What is monitor ghosting and how do I detect it?

Monitor ghosting is a visual artifact where moving objects leave a blurry or shadowy trail ("ghost") behind them on screen. It is caused by the physical response time of the panel's liquid crystal pixels (GtG — Gray to Gray) being slower than the refresh cycle. Look at our Motion Ghosting Visualizer below: on fast VA or older IPS panels, you will observe trailing behind the moving UFO starship.

What is the difference between Monitor Refresh Rate (Hz) and Game Frame Rate (FPS)?

Refresh Rate (Hz) is the hardware frequency at which your physical display panel redraws a new image per second (e.g., 144 times every second for a 144Hz monitor). Frame Rate (FPS) is the number of frames your graphics card (GPU) and CPU render per second. If your GPU outputs 200 FPS but your screen is 60Hz, you will only see 60 images per second, accompanied by screen tearing unless G-Sync or FreeSync is enabled.

How do I test with maximum accuracy and eliminate browser jitter?

Click the ⛶ Enter Fullscreen Test button on this page. Running the test in true fullscreen bypasses OS desktop window compositing (DWM on Windows / Quartz on macOS), giving the browser direct presentation access with zero micro-stutter.

Does browser Hardware Acceleration affect refresh rate testing?

Yes! If hardware acceleration is disabled in Chrome, Edge, or Firefox, the browser will render via CPU software rasterization, which frequently caps at 60 FPS or introduces heavy frame drops. Keep hardware acceleration enabled in browser settings for accurate 144Hz, 240Hz, and 360Hz measurements.

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