Everything You Need to Know About Monitor UFO Test

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UFO Test is a popular tool for testing monitor refresh rate, frame skipping, ghosting test, G-SYNC, FreeSync, and more. UFO Test tools are free, easy to run without any installation required because UFO works in a web browser. Although recommended browsers for running tests are Chrome and Firefox since these two supports testing above 60Hz.

Props to Mark Rejhon who created al those fantastic tests. His blog is also a good source of information. He goes in-depth about monitor motion blur problem, G-SYNC, monitor frequency rate and much much more.

Because he is actually testing monitors by himself with high-speed cameras and other methods, his blog is a reliable source of information. He even collaborated with monitors manufacturers on how to reduce motion blur. He did all kinds of good stuff for the community, so visit his blog whenever you have any unanswered questions about monitors in general or issues.

Let’s Check Some of the Most Established UFO Tests and Demos.

UFO Test Multiple Framerate Demo or commonly called the Fps Test

By default, if you are using 60Hz monitor, this demo shows three lines, 15/30/60 FPS. If you are using a 120Hz monitor, it is automatically added to the test. In my case, an overclocked monitor to 74Hz was also automatically added to the test.

You can expand this test to max six lines of moving UFOs and control their speed, UFO counts, and background. Best use of this test is to convince your console loving friends that your eyes above 24/30 frames per second and that the cinematic experience is just an excuse. Joke aside this test is super useful for just checking at what Hz your monitor is actually running and if your overclocking was successful.

Second most popular is UFO Ghosting test.

In this test, we can observe ghosting our monitor produce with a variety of options.

Ghosting is usually very noticeable on monitors with the low response time that’s because response time is the cause of it. When the monitor refreshes itself, we can still notice previously displayed images. We call this previous image or leftover pixels an artifacts. In fast motion, these artifacts cause blurriness or Ghosting. Although this definition is not totally accurate, it is widely accepted over the wide-web and community, and it’s somewhat a generalization of everything blurry on our monitors.

There are many types of motion artifacts that cause of what we perceive as screen blurriness or smearing. They are called Ghosting, inverse Ghosting and motion blur. Blurbusters.com has these artifacts pretty much nailed down and explained in-depth, so I suggest visiting that website if you want to learn more about it.

In general, we want as little Ghosting as possible on our monitors so we can get that crisp picture when we are scrolling down the text or gaming. Many monitors have solutions already in place to reduce Ghosting. Not all companies name it the same. Most of the time, blur reducing technology is called Overdrive. Usually, you can set this in the monitor settings menu.

UFO Response time test

Response time test. Great for checking if the monitor has described advertised refresh rate which way too often it doesn’t. I would imagine it is also useful if you simply don’t know a specific monitor response time.

There are actually two methods of measuring LCD response time. MPRT stands for Motion Picture Response time, and another is GtG or Grey to Grey. Both of those two different methods are designed to measure motion blur on the LCD display. And you can compare those two methods side by side on one of the UFO test called Compare MPRT Versus GtG.

UFO Frame Skipping Test

This test is handy, especially for monitors overclockers, but you should also check any new monitor you buy for frame skipping. Frameskipping is terrible for gaming because these issues can really hinder gameplay.

Frameskinping is what name already suggest it skips part of the animation which is composed of multiple frames. Frames are basically images graphics card is rendering (FPS, images/frames per second). If your monitor is frame skipping, it loses part of that animation. You can imagine playing the fast-paced multiplayer game when and suddenly get killed by an enemy you weren’t even able to see. It’s similar to lag for not exactly the same.

This test is straightforward to perform. Just take a picture of the UFO frame skipping test. I made a picture with a budget camera and phone camera, and both still worked for me.


Clearly, this test won’t work with Windows 10 Print Screen function.

If you have any problems with this test, you can tweak settings on your camera and monitor to get better results. Lower your ISO on your camera or decrease brightness on your monitor. Point of this setting is we try to trick, or force camera to do more prolonged exposure so it can capture more moving squares. If you can set your camera exposure, set it a tenth of a second or lower.

So when you take the picture and if you see any gaps between moving squares, that means your monitor is suffering from frame skipping. RMA that bad boy or Decrease overclocked Hz and test it again until you don’t see any gaps between moving squares.

And there are many more test and demos you check out on their site.

What Are Computer Visual Artifacts

They are also commonly called as glitches if the cause of it is a graphics card.

Simply said, they are visual anomalies that should not be present on the computer or computer monitor.

They are more noticeable if the cause is a graphics card; they are much more visible and totally different. Some common reasons for graphics card artifacts are:

– Graphics cards drivers

– Faulty graphics cards

– The consequence of graphics card overclock

– Computer LCD monitors

Other most common and known computer artifacts are LCD monitor artifacts.

They are most known to cause monitor blurriness or smearing. Below are types of ghosting or motion artifacts.


-Inverse Ghosting/ Coronas

-Motion Blur

-PWM Artifacts or Pulse-Width Modulation Artifacts

Fortunately, some technologies reduce LCD monitor motion artifacts

Response Time Compensation aka Overdrive

Enabling Overdrive setting drives more voltage to the liquid crystals that causes pixel alignment much faster, thus reducing response time and monitor artifacts. Not reducing Ghosting is most noticeable in gaming and in fast movies action scenes and of course other operations involving fast-changing pixel colors.

Response Time Compensation or overdrive can reduce LCD monitor blur or smearing. UFO Test website found out that sweet spot for ASUS TraceFree setting is 60 after that, inverse Ghosting or coronas become visible.

The bottom line of this test was that with low overdrive settings ghosting is noticeable while in high overdrive settings, coronas can be visible. That can all vary on the different manufacturer and computer monitors. Tweak the monitor setting so you can find your sweet spot.

Note that some monitors settings are not necessarily compatible with Overdrive technology, for example in some cases turning on Fresync disables Overdrive settings.

Different manufacturers use different names for LCD overdrives

– Acer – Overdrive

– ASUS- Trace Free Technology

– AOC International – Overdrive

– BenQ – AMA or Advanced Motion Acceleration

– Dell – Overdrive/OC

– Samsung – Overdrive

Possible UFO Test on a smartphone

Because the UFO Test is web browser-based, you can even run it on your mobile devices. So testing your mobile devices screens is as easy as going to UFO website and that’s about it.

I only had one issue with a mobile phone while on the UFO Test website. I couldn’t run full-screen mode on the latest android device, everything else worked just fine.

Note that recommended browsers for UFO test are Chrome or Firefox for up to 240Hz+.


I had a fun time exploring the UFO Test website. I have tested the things I didn’t even know could be an issue, and for some, I also thought they were normal. UFO Test website is handy for monitor reviewers, buyers overclockers or folks who just want to test what their monitor is capable of.

Anything is better than 60Hz.

Props to Mark Rejhon who created




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