Check if your monitor is actually running at its rated refresh rate (60Hz, 144Hz, 240Hz) with a full telemetry dashboard: live Hz, average, 1% low, frame time, jitter and stability. Includes a timed benchmark, frame-time consistency graph and a fullscreen screen-tearing test. Free, no download, runs in your browser.
Find out the true refresh rate your monitor is running at, 60Hz, 75Hz, 120Hz, 144Hz, 165Hz, 240Hz or higher, straight from your browser. The test measures the real interval between the frames your display paints and reports live Hz, average, 1% low, frame time, jitter and a stability score, so you can confirm a 144Hz or 240Hz monitor is actually running at its rated speed and not silently capped at 60Hz. A timed benchmark, a frame-time consistency graph and a fullscreen motion test for screen tearing make it a complete display-diagnostics dashboard.
Calibrating Refresh Rate Analyzer......
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This test measures how many frames per second your display actually paints in the browser, confirming whether your 60Hz, 120Hz, 144Hz, or 240Hz monitor is running at its rated speed. It's the quickest way to verify a new display or check that high-refresh mode is genuinely enabled, with no software to install.
Shut down games, video calls, and background downloads so nothing throttles your GPU while the test runs.
The tool immediately begins measuring the interval between painted frames and shows your live refresh rate in Hz.
Wait a few seconds for the number to stabilise, the running average is more accurate than the first frame.
If a 144Hz or 240Hz display reads around 60Hz, check your cable, Windows display settings, and GPU driver, then test again.
A monitor advertised at 144Hz often defaults to 60Hz out of the box. The usual culprits are a cable that can't carry the bandwidth (use DisplayPort or HDMI 2.0+ for high refresh at 1440p or 4K), a Windows setting still left at 60Hz under Display > Advanced display, an out-of-date GPU driver, or the display being plugged into the motherboard's video output instead of the graphics card. This test tells you the real number so you know whether a fix is needed.
The moving UFO animation runs at several frame rates so you can spot screen tearing, the horizontal split that appears when your GPU and monitor fall out of sync. With G-Sync or FreeSync (variable refresh rate) enabled, motion should stay clean across rates; if you still see tearing, adaptive sync may be switched off in your GPU control panel or the monitor's on-screen menu.
A higher refresh rate redraws the screen more often, so motion looks smoother and input feels more responsive. The jump from 60Hz to 144Hz is dramatic for fast games and even everyday scrolling; 144Hz to 240Hz is subtler and mainly benefits competitive players. This test lets you compare what your hardware truly delivers against what you paid for.
Whatever rate your display is set to, the test reports the real number. A reading around 60Hz or 75Hz means you're on a standard office monitor or a high-refresh panel that hasn't been switched over; 120Hz and 144Hz are the common gaming and modern-laptop rates; 165Hz is a frequent factory-overclock step; 240Hz and 360Hz are esports-tier. If you own a 144Hz or 240Hz screen and the test shows 60Hz, the panel is capable but your system is still driving it at the lower rate, which the steps below fix.
On Windows 11, go to Settings > System > Display > Advanced display, and set 'Choose a refresh rate' to the highest value your monitor supports; on Windows 10 the same control lives under Advanced display settings > Display adapter properties > Monitor tab. On macOS, open System Settings > Displays and hold Option while clicking 'Refresh Rate' to reveal every available rate. If the rate you expect isn't listed, the cause is almost always the cable or port, use DisplayPort or HDMI 2.0+ and plug into the graphics card, not the motherboard, then re-run this test to confirm.
Refresh rate (Hz) is how many times per second the monitor can redraw the image; FPS is how many frames per second your GPU produces. They're separate limits, and you only get smooth motion when both are high: a 144Hz monitor fed 60 FPS still looks like 60, and a game running 200 FPS on a 60Hz panel is capped at 60 on screen (the extra frames just cause tearing without V-Sync). This tool measures the display side, your Hz, so you can confirm the monitor half of the equation is doing its job.
A single average Hz reading hides a lot, so this test breaks your display down the way benchmarks do. Frame time is milliseconds per frame (16.67ms at 60Hz, 6.94ms at 144Hz, 4.17ms at 240Hz) and it's the value that actually governs how motion feels. Jitter is how much that frame time wobbles from frame to frame, low jitter is smooth, high jitter is micro-stutter. The 1% low reports the Hz of your worst 1% of frames, which is a far better smoothness indicator than the average because a panel can average 144Hz yet still hitch on its slowest frames. The stability score rolls all of that into one 0-100% figure.
The frame-time histogram shows how tightly your frames are paced. On a healthy fixed-rate display almost every frame lands in the same bucket, producing one tall spike around the target frame time. When the bars spread out, something is disrupting the cadence, background CPU load, browser throttling, thermal limits, or a variable refresh rate that's constantly changing the interval. Running the timed benchmark for 10 or 30 seconds gives the histogram enough samples to make stutter obvious, which is useful when a monitor 'feels' laggy even though its average Hz looks correct.
Open this page and the tool will automatically measure your display's actual refresh rate using requestAnimationFrame timing. It shows your real Hz in real-time.
Your OS defaults to 60Hz even on high-refresh monitors. Fix it by going to Windows Settings → Display → Advanced Display Settings → Refresh Rate, then select 144Hz.
A 60Hz monitor refreshes 60 times per second, while 144Hz refreshes 144 times. Higher Hz means smoother motion, especially noticeable in fast games and scrolling. The difference is visually significant.
Yes. Higher refresh rates reduce the perceived flicker, which many users find reduces eye fatigue during long sessions. 144Hz is recommended for extended computer use.
When a block moves at 30fps on a 60Hz screen, each frame is displayed twice. Your eye's smooth pursuit tracking fails, causing visible stutter. This demonstrates the real-world impact of low framerates.
Screen tearing happens when your GPU sends frames faster than the monitor can refresh, causing visible horizontal splits in the image. V-Sync, G-Sync, and FreeSync all fix this by syncing GPU and monitor.
Very accurate for confirming your rate. The test uses the browser's high-resolution animation timing to measure the real interval between painted frames, which lines up with your monitor's actual refresh rate. Momentary background activity can nudge the number, so let the reading settle for a few seconds for the most reliable result.
Yes. The test reads whatever rate your browser is receiving, so it reports 120Hz, 144Hz, 165Hz, 240Hz, 360Hz and beyond. Make sure the high rate is selected in your OS display settings first, otherwise the test will correctly show the lower rate your system is actually using.
Run the test for at least 30 seconds and it measures how many times per second your display refreshes, reporting whether it is 60, 120, 144, 240 Hz or higher. The longer it runs, the more accurate the reading.
This test shows the measured refresh rate your browser sees, which should match your setting. If it reads 60 Hz when you expect 144, check your OS display settings and cable, since a high-Hz monitor can default to 60.
Yes. It measures the refresh rate of any display, including laptops and phones (many modern phones run at 90 or 120 Hz), directly in the browser.
Go to Settings → System → Display → Advanced display, then set 'Choose a refresh rate' to 144Hz (or the highest your monitor supports). On Windows 10 it's under Advanced display settings → Display adapter properties → Monitor tab. If 144Hz isn't offered, switch to a DisplayPort or HDMI 2.0+ cable and make sure it's plugged into your graphics card, then re-run this test to confirm.
Refresh rate (Hz) is how many times per second your monitor redraws the image; FPS is how many frames your GPU renders per second. Smooth motion needs both to be high, a 144Hz monitor fed only 60 FPS still looks like 60, and 200 FPS on a 60Hz screen is capped at 60. This tool measures the Hz your display is actually running.
Frame time is how long each frame is shown, in milliseconds, and it's just the inverse of your refresh rate: 60Hz is about 16.67ms per frame, 144Hz is about 6.94ms, and 240Hz is about 4.17ms. It's the value games and monitors care about most, because steady frame time (not just a high average) is what makes motion feel smooth.
Jitter is how much your frame time varies from one frame to the next, measured as standard deviation in milliseconds. Low jitter means every frame arrives on a metronome; high jitter means uneven pacing you perceive as micro-stutter. The stability score turns that into a single 0-100% number, higher is smoother. Background apps, browser throttling and an unstable variable refresh rate all push jitter up.
The 1% low is the refresh rate of your slowest 1% of frames, expressed in Hz. It's a much better indicator of perceived smoothness than the average, because a display can average 144Hz yet still hitch if its worst frames drop far lower. A 1% low close to your average means consistently smooth motion; a big gap means occasional stutter.
Click the 3s, 10s or 30s button to capture a fixed-duration sample. A longer capture averages out momentary background hitches, browser garbage collection and one-off dips, so the resulting number is far more trustworthy than the first reading. When it finishes you can copy the full results (detected Hz, average, 1% low, frame time, jitter and stability) to share or record.
Open the Motion & screen-tearing test, click Fullscreen, and watch the sweeping bar. If the moving edge stays a single clean vertical line, adaptive sync (G-Sync / FreeSync) or V-Sync is working. If you see a horizontal split where the top and bottom of the bar are offset, that's tearing, meaning your GPU and monitor are out of sync. Adjust the speed slider to make tearing easier to spot at your refresh rate.
The test needs a short window of frames to measure the real interval between them, so it spends the first second or two calibrating before locking onto your detected rate. If the number ever looks off, click Recalibrate, close heavy background apps, and let it settle again, or run a timed benchmark for the most reliable figure.
Indirectly, yes. With VRR active the refresh rate isn't fixed, so you'll see the live Hz and frame-time histogram move around rather than sit on one value, and jitter reads higher than on a locked panel. A single tall spike in the frame-time graph means a steady rate; a spread of bars is the signature of a display that's constantly changing its refresh rate.
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