Refresh Rate Test Online

Open the refresh rate test, keep the browser tab focused, and wait for the sample to stabilize. The tool measures browser frame timing and reports the detected monitor Hz, median frame interval, and stability. If the result is near 60Hz on a 144Hz or 240Hz monitor, check your operating system display settings, GPU control panel, cable, dock, browser window placement, and multi-monitor setup.

A high-refresh monitor often shows 60Hz when the OS is still set to 60Hz, the HDMI or DisplayPort cable cannot carry the selected resolution and refresh rate, the browser is on a different monitor, battery saver is limiting refresh rate, or the GPU driver reset the display mode. Set the monitor to 144Hz, 240Hz, or its rated value in system display settings, then rerun the test.

Several factors can cause a lower-than-expected reading: (1) Your OS display settings may still be set to 60 Hz; check Settings > Display > Advanced Display Settings on Windows or System Settings > Displays on macOS. (2) Your cable may not support the monitor full bandwidth; DisplayPort 1.4 and HDMI 2.1 are required for high refresh rates at 4K. (3) Your GPU driver may limit the rate; verify with NVIDIA Control Panel or AMD Radeon Software. (4) Browser hardware acceleration may be disabled; enable it in your browser performance settings.

Standard deviation (Std Dev) describes how consistent the sampled browser frame intervals are. A low value means callbacks arrived at regular intervals during the test. A higher value can reflect browser scheduling, background load, power saving, variable refresh behavior, or display configuration. It is a browser timing indicator, not a hardware diagnosis.

The test works in modern browsers that support requestAnimationFrame, including Chrome, Firefox, Edge, and Safari. Animation-frame timing is influenced by the active display mode, browser scheduling, page visibility, and power policies. Mobile browsers may limit callbacks for battery efficiency, so results on phones and tablets can read below the display hardware capability.

60 Hz is the baseline acceptable for most content. 144 Hz is the current standard for competitive gaming, where smoother motion and lower input lag provide a measurable advantage in fast-paced titles. 240 Hz and above are used by esports professionals where every millisecond of response time matters. For casual gaming and productivity, 60-75 Hz is generally sufficient. For video work, 60 Hz matches most broadcast frame rates well.

This almost always means the monitor is set to 60 Hz in your operating system, not hardware. On Windows, right-click the desktop, open Display Settings, then Advanced Display Settings, and choose 144 Hz from the refresh rate dropdown. On macOS, open System Settings, then Displays, and select the higher rate. Also verify you are using a cable that supports 144 Hz at your resolution. After changing the OS setting, rerun this test to confirm the change took effect.

Yes, directly. Each frame represents a window of time during which new inputs can be displayed. At 60 Hz, each frame is 16.67ms, so your input can be delayed by up to one full frame before appearing on screen. At 144 Hz, that window shrinks to 6.94ms. At 240 Hz, it is 4.17ms. This is why high refresh rate monitors feel more responsive even before accounting for panel response time or GPU render latency.