Monitor Ghosting Test Tools Comparison: UFO Test, Blur Busters, and Online Detection

When purchasing a new monitor or debugging an existing one, ghosting testing is a key step in determining dynamic picture performance. However, faced with numerous online tools such as UFO Test, Blur Busters, and TestUFO, many users are unsure how they differ, how to use them, and how to interpret the test results. This article will provide a side-by-side comparison of mainstream ghosting test tools and summarize a complete set of online screen ghosting test methods to help you scientifically evaluate whether a monitor is qualified.

I. Overview of Mainstream Ghosting Test Tools

Currently, online ghosting test tools mainly focus on two core dimensions: "motion blur" and "response time." Different tools have different emphases and applicable scenarios:

• UFO Test (testufo.com): The most classic ghosting test website, offering a variety of motion graphics tests, including Moving Photo, Ghosting, Pursuit Camera, etc., allowing intuitive observation of ghosting, afterimages, and response time performance.
• Blur Busters: Both a testing tool and a technical community, operated by experts in the field of monitor response time. Its UFO Test is essentially the same system as TestUFO, but Blur Busters also provides a large number of in-depth articles and advanced testing methods, such as the Pursuit Camera tracking photography test.
• TestUFO: An online testing platform deeply tied to Blur Busters, usually serving as the testing entry point for Blur Busters. Its functionality is basically the same as UFO Test, but with a cleaner interface focused on motion blur testing.
• Other auxiliary tools: Such as EIZO Monitor Test and Lagom LCD test, which also include simple response time or motion blur test modules, but are less professional and customizable than UFO Test.

II. Detailed Comparison of Each Tool

• UFO Test (testufo.com)
  This is the preferred ghosting test tool for the vast majority of users. After entering the website, the page displays a fast-moving UFO graphic against backgrounds of different grayscale levels. By observing whether the UFO edges are clear and whether there is trailing or ghosting, you can intuitively judge the degree of ghosting. Its advantages include being fully online, requiring no installation, supporting high refresh rate monitors, and allowing real-time comparison with Overdrive setting changes. The disadvantage is that results rely on subjective human judgment and cannot provide precise response time values.
• Blur Busters Website
  Blur Busters is not only a testing tool but also an authoritative knowledge base on monitor response time. Its testing section is the same as UFO Test, but it provides detailed interpretation guides around the tests, such as how to distinguish between ghosting and afterimages, how to choose Overdrive settings, and how to understand the difference between MPRT and GTG. It is suitable for users willing to learn more about monitor principles. Additionally, Blur Busters promotes the Pursuit Camera testing method, which uses a phone to track and photograph moving graphics, combined with software analysis to obtain more objective response time data.
• TestUFO Platform
  TestUFO can be understood as a simplified version of UFO Test or a different domain entry point for the same project. Its testing functionality is basically the same as UFO Test, but with a cleaner interface that reduces distracting elements, making it more suitable for quick testing. If you just want to quickly check ghosting, TestUFO is sufficient; if you need more customization options and testing instructions, it is recommended to use UFO Test or the Blur Busters main site directly.
• EIZO Monitor Test and Lagom LCD test
  These two types of tools are more commonly used for comprehensive monitor performance testing, including color, grayscale, response time, etc. Their ghosting test modules are relatively simple, usually just moving blocks or lines, and cannot provide different grayscale backgrounds and speed adjustments like UFO Test. However, as supplementary detection, they can verify the monitor's performance in non-typical scenarios.

III. How to Interpret Ghosting Test Results

Regardless of which tool you use, you should pay attention to the following key phenomena when observing ghosting:

• Trailing (Motion Blur): A blurred tail appears behind a moving object, usually caused by excessively long response time. The longer the trail, the slower the panel response and the less clear the dynamic picture.
• Ghosting / Overshoot: Inverted or bright afterimages appear at the edges of objects, usually caused by Overdrive settings being too high, resulting in overshoot. Ghosting is more noticeable and harder to tolerate than trailing, and you need to lower the Overdrive setting in the OSD.
• Edge Sharpness: In the UFO Test, the sharper the UFO graphic edges, the shorter the response time. If the edges appear blurry or stepped, it may be caused by resolution or motion blur.
• Grayscale Transitions: The background of UFO Test usually contains multiple grayscale areas, and switching speeds may differ across different grayscale levels. Pay special attention to bright objects on dark backgrounds and dark objects on bright backgrounds. VA panels often show noticeable black trailing during dark transitions.

IV. How to Determine Whether a Monitor Is Qualified

There is no absolute quantitative standard for whether ghosting is acceptable, but you can make a comprehensive judgment by combining subjective perception and objective parameters:

• Subjective Perception: In the UFO Test, if the UFO graphic edges are basically clear with only very slight blur and no obvious ghosting, the ghosting is within an acceptable range. If there is no noticeable discomfort during normal gaming or web page scrolling, it can be considered qualified.
• Comparison with Advertised Response Time: Mainstream fast IPS panels have GTG response times of 1-4ms, TN panels can be below 1ms, and VA panels are typically 4-8ms or higher. If the measured ghosting performance seriously deviates from the advertised values, it may be due to Overdrive not being enabled or individual monitor variance.
• Overdrive Setting Testing: Gradually adjust the Overdrive setting in the monitor's OSD and observe the balance between ghosting and afterimages in the UFO Test. The ideal state is to minimize ghosting without obvious afterimages. If no setting can balance both, it indicates that the panel's response time itself is inherently slow.
• Pursuit Camera Test (Advanced): Use a phone to track and photograph the moving graphics in UFO Test, combined with Blur Busters' Pursuit Camera analysis tool, to obtain more objective response time values. This method is suitable for rigorous reviews or comparing multiple monitors.

V. Summary of Online Screen Ghosting Test Steps

• Step 1: Preparation. Ensure the monitor is set to its highest refresh rate and the system graphics card output is normal. Disable browser smooth scrolling and any extensions that may affect rendering. Use Chrome or Firefox or other browsers that support high frame rate display.
• Step 2: Open UFO Test. Visit testufo.com, and the page will automatically run the moving UFO graphic. Adjust the monitor's Overdrive setting while observing changes in the UFO edges.
• Step 3: Observe ghosting and afterimages. First look at the degree of trailing, then check whether there are inverted afterimages at the edges. If ghosting is obvious, lower Overdrive; if trailing is severe, try increasing Overdrive or confirm whether the panel type is inherently slow.
• Step 4: Switch grayscale backgrounds. Some UFO test pages provide background switching options. Repeat the test under different backgrounds, paying special attention to performance on dark backgrounds.
• Step 5: Verify with auxiliary tools. If necessary, use EIZO Monitor Test or Lagom LCD test for comprehensive detection to confirm that the monitor has no other abnormalities.
• Step 6: Record the results. Compare the test results with the advertised parameters to determine whether a return or exchange is needed or whether settings should be adjusted. For gamers, it is recommended to test under commonly played game genres, as different games have different sensitivities to ghosting.

VI. Conclusion

UFO Test, Blur Busters, and TestUFO are currently the most mainstream online ghosting test tools. The three overlap significantly in functionality but each has its own focus: UFO Test is the most intuitive and easy to use, Blur Busters provides in-depth knowledge support, and TestUFO is more streamlined. By correctly interpreting ghosting, afterimages, and edge sharpness, combined with Overdrive setting adjustments, you can quickly determine a monitor's actual performance in dynamic scenes. Remember, ghosting testing is not just about parameters—actual visual experience is the ultimate standard. I hope this article helps you be more confident when purchasing and debugging monitors.