— Hz
Realtime frame detection
Settings
Live
Screen refresh rate test
Run a free screen refresh rate test online — live Hz readout, fps test, and frame time chart. Keep this tab focused for the most accurate monitor refresh rate results.
Keep this tab focused. Hz is sampled via requestAnimationFrame.
Screen & monitor refresh rate test — Hz and fps checker
Real-time Hz test and refresh rate detection, frame time consistency visualization, and motion block verification at 1×, 2×, 4×, and 8× speed — a browser-based refresh rate check similar to Test UFO for Hz confirmation, with no install required.
Hz test & frame rate readout
requestAnimationFrame-based Hz test showing current, max, min, and average refresh rate. A 1-second sample interval keeps the frame rate readout stable and reliable.
Motion block test
Synchronized sliding blocks at four speeds (1×, 2×, 4×, and 8×). High-refresh panels show crisp block edges; 60Hz panels show noticeable motion blur on the fastest track.
Frame time visualization
A live frame interval chart reflects stability better than averages alone. Uniform green bars mean smooth output; red spikes mean dropped frames.
What is monitor refresh rate?
Understanding monitor refresh rate, Hz tests, and frame rate helps you interpret what this screen refresh rate test measures.
Refresh rate (Hz)
How many times per second your display redraws its image. 60Hz equals 60 refreshes per second (16.67ms per frame); 144Hz equals 144 refreshes (6.94ms per frame). Higher refresh means smoother motion and lower input lag.
Frame rate (FPS)
How many frames the GPU renders per second. In browsers, FPS is limited by V-Sync — the browser locks render rate to the display refresh rate. This tool effectively measures your panel's active refresh rate in this session.
Frame time
The interval between consecutive frames. At 60Hz the ideal is 16.67ms; at 144Hz it is 6.94ms. Consistency matters more than the average — frequent 30ms spikes cause visible stutter even when FPS looks fine.
How to test monitor refresh rate online
This free online refresh rate test confirms your monitor is running at its configured Hz in about one minute. Three steps: set OS display settings, read the live gauge, then verify motion blocks.
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Confirm system settings
Open display settings and set refresh rate to maximum. On Windows: Settings → Display → Advanced display. On macOS: System Settings → Displays (hold Option for refresh rate). Many gaming monitors and laptops default to 60Hz until you change it manually. See also: refresh rate setup tips .
Tip OS panel should show your target Hz before you test
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Check real-time rate
The live Hz readout at the top of this page should stabilize within a few seconds. Keep this tab focused — background tabs throttle the frame loop. If you set 144Hz but see ~60, check your cable (DisplayPort 1.2+ or HDMI 2.0+), dock, and that browser hardware acceleration is on. See also: screen tearing test .
Tip Readout within ±2Hz of your setting means the test is working
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Verify motion smoothness
Use the motion block test at 1×, 2×, 4×, and 8× speed in the dashboard above. On a high-refresh panel, the fastest block keeps sharper edges and less blur. If every track looks identical, your higher refresh rate may not be active yet. See also: ghosting test .
Tip The 8× track is the easiest visual confirmation
Refresh rate standards explained
60 Hz (standard)
The baseline for office work, browsing, and video. Most content is 24, 30, or 60 FPS — 60Hz covers it well. Frame interval: 16.67ms.
120 / 144 Hz (high refresh)
Mainstream for gaming and premium laptops. Scrolling and cursor motion look noticeably smoother than 60Hz. Frame interval: 6.94–8.33ms.
240 Hz (competitive)
Common in esports monitors. Gains over 144Hz are smaller than the jump from 60→144, but input lag and motion clarity still improve. Frame interval: 4.17ms.
Variable refresh (VRR)
G-Sync, FreeSync, and HDMI VRR match panel refresh to GPU output to reduce tearing. Browser V-Sync already syncs to your display's fixed refresh during this test.
Refresh rate needs by use case
Office & web
- 60Hz is adequate for documents, spreadsheets, and browsing.
- 120Hz makes scrolling and window movement noticeably smoother.
- Above 120Hz brings diminishing returns for typical office tasks.
Gaming (competitive)
- 144Hz is a common entry point; 240Hz is the competitive baseline.
- GPU output should consistently reach the panel's max refresh.
- Pair high refresh with low response time for the clearest motion.
Video & film
- Film is 24fps; TV is often 30fps; HFR content is 60fps.
- 60Hz covers mainstream video without issue.
- 120Hz can display 24fps and 30fps at integer multiples.
Mobile devices
- Modern phones and tablets commonly ship with 90–120Hz panels.
- Adaptive refresh (LTPO) drops rate on static content to save power.
- High refresh dramatically improves scrolling and UI animation.
Screen refresh rate test FAQs
What is a Test UFO refresh rate test?
Test UFO (Blur Busters) is a popular site with UFO motion patterns for refresh rate and ghosting checks. This page is a browser-based screen refresh rate test focused on live Hz readout, fps timing, and frame time consistency — use it to confirm 60Hz, 144Hz, or 240Hz is active. For UFO-style motion blur trails, try our ghosting test after verifying Hz here.
Is this a Test UFO alternative for refresh rate?
Yes, for Hz and fps confirmation. Open this screen refresh rate test in a focused tab and watch the live readout settle at your display setting — similar to checking refresh on Test UFO, but with frame time charts and motion blocks built in. Pair it with our ghosting test for UFO-style smear patterns after Hz is verified.
How do I run a screen refresh rate test online?
Set your monitor to its target refresh in Windows or macOS display settings, open this page full screen, keep the tab focused, and wait for the Hz readout to stabilize. That number is your active screen refresh rate. Use motion blocks at 1×–8× speed to confirm smooth output matches the setting.
How do I run an fps test in the browser?
This page works as a browser fps test when V-Sync is active: the Hz readout shows how many frames per second your display refreshes in this tab. For in-game FPS, use your game's overlay or GPU software — this tool confirms the monitor refresh rate your browser session is locked to.
How do I run an Hz test on my monitor?
Set your display to its maximum refresh in Windows or macOS, open this page in a focused tab, and watch the live Hz readout stabilize. That is your Hz test — it uses requestAnimationFrame timing locked to V-Sync, so it reflects the refresh rate your panel is actually outputting.
How do I check my monitor's frame rate?
Use the live Hz readout at the top of this page as a frame rate test for what your browser can display. With V-Sync on, FPS matches refresh rate — 144Hz means about 144 frames per second in this tab. The frame time chart shows whether those frames arrive evenly or stutter.
How do I run a 144Hz test?
In display settings, select 144Hz (Windows: Settings → Display → Advanced display; macOS: System Settings → Displays with Option held for refresh rate). Open this test full screen, keep the tab focused, and confirm the readout settles near 144. Use a DisplayPort 1.2+ or HDMI 2.0+ cable — HDMI 1.4 often caps at 120Hz at 1080p.
How do I test my monitor refresh rate online?
Set your display to its maximum refresh rate in Windows or macOS settings, open this monitor refresh rate test in a focused browser tab, and wait for the live Hz readout to stabilize. Use the motion blocks at 1×–8× speed to confirm smooth output matches your setting.
What is an Hz test?
An Hz test measures how many times per second your display refreshes — 60Hz, 120Hz, 144Hz, and so on. This page runs an Hz test in the browser by timing requestAnimationFrame, which is locked to your monitor's active refresh rate via V-Sync.
What is the difference between a refresh rate test and a frame rate test?
Refresh rate is how often the monitor redraws (Hz). Frame rate is how many frames the GPU or browser produces per second (FPS). In this tool, both align when V-Sync is active — the Hz readout is effectively a frame rate test of what your screen is actually displaying.
Why does it show 60Hz when my screen is 144Hz?
Most common causes: system display settings still at 60Hz, an HDMI 1.4 cable (1080p max ~120Hz), browser hardware acceleration disabled, or laptop battery saver capping refresh.
Is the browser measurement accurate?
Under normal conditions it is accurate within about ±1–2Hz because it follows V-Sync timing. Background tabs, heavy CPU load, or browser power-saving can lower the reading.
Why are there red spikes in the frame time chart?
Red spikes mean a frame exceeded 20ms — a dropped or delayed frame. Background tasks, garbage collection, or other tabs can cause this. Occasional spikes are normal; frequent ones affect smoothness.
Is high refresh rate bad for eyes?
Higher refresh often reduces flicker and motion blur, which can feel easier on the eyes during long sessions. It is not a substitute for proper brightness, distance, and break habits.
Is the difference between 60Hz and 144Hz really noticeable?
Yes — scroll a webpage or drag a window quickly. At 144Hz edges stay crisper; at 60Hz motion blur is obvious. Gains above 144Hz follow diminishing returns for most users.
VRR or fixed refresh — which is better?
VRR helps when frame rates fluctuate — it reduces tearing without fixed V-Sync input lag. If your frame rate consistently hits the display maximum, both feel similar in practice.
Refresh rate setup tips
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Windows
Right-click desktop → Display settings → Advanced display → choose the highest refresh rate.
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macOS
System Settings → Displays → hold Option and click refresh rate → select the highest value.
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GPU drivers
NVIDIA Control Panel and AMD Software may expose refresh options beyond the OS display menu.
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Quick check
After switching refresh rate, drag a window quickly — high refresh should look noticeably smoother.
