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The Best Thermal Imager for Your Smartphone

Best Thermal Imager for Your Smartphone: FLIR One vs. SEEK Compact

When thermal imaging cameras were first developed, they were massively expensive, big, and required training to use.

As technology advanced, thermal imaging has become more widely available, resulting in thermal imagers that are small,  versatile and easier to use.

It was only a matter of time before thermal image technology entered the smartphone market.

The FLIR One and Seek Compact thermal imagers are relatively new, but both have quickly become the two most popular infrared cameras available for Android and iOS devices.

These two thermal imagers are not perfect by any means, but they provide much more than novelty use or gimmicks.

They are the real deal and are fully capable of offering accurate imaging that you can use in and around your home, and plenty of other applications.

Both the FLIR One and Seek Compact retail for under $200, leaving many consumers at odds for which one to choose for their own use.

This article compares the two devices in detail to help you make an informed buying decision.

Shared Traits

Before highlighting some of the differences of the two imagers, let’s first learn what they have in common.

Thermal Cameras For Smartphone

Available for Both Android and iOS

Don’t worry about having to choose whichever thermal imager depending on your phone type. They are both available on the two biggest platforms.

Photo and Video Capabilities

Both the One and Compact are able to capture images and video, making them equally versatile. Each device can toggle from video to photo with ease, while also offering different color palettes in which to view your files.

Laser Thermometer

The One and Compact both have the ability to display the temperature of either the center of the screen, or the hottest and coolest areas within the field of view. Both thermometers are fairly accurate, and serve to give greater insight to the visual.


Each device relies on a direct connection to the phone via the charging port, rather than using a Bluetooth connection. Got a case on your phone? You’ll likely have to remove it, regardless of which imager you are using.

Advantages of the FLIR One

The FLIR One has the edge over the Seek Compact when it comes to a few key factors.

FLIR ONE for iOS and Android

Image Overlay

The biggest difference you’ll notice when using these two imagers back-to-back is the fact that the One has both a digital camera and a thermal sensor. This allows the One to overlay the visible light photo with the thermal version, creating a detailed photo that provides you with a proper context in which to view the thermal image.

When it comes to image clarity (the entire point of thermal imaging to begin with,) it’s hard to compete with the FLIR One.

Additional Capture Modes

While both devices can take video and images, the FLIR One gives you a few more useful options. Panorama and time-lapse features allow you to have a few different versions of the object or area you are imaging, giving even more insight into the thermal profile at hand.

The panoramic features is especially helpful in creating an image of a larger area without the need to look at multiple photos in a row.


The FLIR One’s proprietary app includes a load of options and uses for the device, including multiple ways to post-process and share your images.

The FLIR One is also very popular with app developers, as you’ll notice by the large number of third-party apps on the Google Play and Apple iTunes app Store.

Advantages of the Seek Compact

The Seek Compact may fall short in some areas when compared to the FLIR One, but it has plenty of characteristics that edge out the One elsewhere.

Seek Compact Thermal Imager Resolution

Temperature Range

The FLIR One has a useful overall temperature range of -4°F to 248°F, but The Seek Compact measures a wider thermal range, from -40°F to 626°F. 

So, if your application involves extreme cold or heat, the SEEK Compact is your best choice.

Thermal Resolution

The Seek Compact’s thermal sensor provides a resolution of 206 x 156, which is a pretty big advantage over the FLIR One’s tony resolution of 80 x 60. 

The Seek Compact shows more detail in the thermal image.


The Seek Compact lacks the digital camera lens of the FLIR One, which trims down the size and weight down by a large margin. The Compact is about one-third the size of the One, and weighs just half an ounce, as opposed to the 2.75 ounce size of the One. You’ll barely even know it’s there when using the imager.

No Battery

Unlike the FLIR One, which has its own battery and needs to be recharged every few hours, the Seek Compact draws its power from the phone. Yes it will wear your battery down, but many would prefer having to charge a single device rather than two.


Seek includes a waterproof hard case with the Compact, and it even has a keychain attachment. This makes the Seek awfully hard to misplace, and very easy to throw in toolbox, or carry around in your pocket or tool belt. The waterproof aspect adds a little more peace of mind when you are in outdoor areas.


Both of these imagers are exceptional thermal imagers for the size, and especially when considering the fact that you can now have thermal imaging on your phone in a matter of seconds by simply connecting a small device.

FLIR ONE for iOS and Android

The FLIR One, despite having a lower thermal resolution than the Seek Compact, provides crisp and clean images that are easy to observe. The MSX image overlay technology makes a huge difference when trying to identify crucial details of an image. For the novice user, this is huge.

The additional camera modes can be very helpful in certain situations, giving you much more versatility over the Seek Compact.

That’s not to say that the Seek is vastly inferior -- it’s far from it. While the images don’t have the advantage of possessing the extra details a FLIR One provides, they are still adequate.

Those that may need a smartphone thermal camera in work settings or during outdoor scenarios such as camping will appreciate the small size and ruggedness of the Compact. The expanded temperature range and lack of charging will come in handy more than once as well.

Which is Best?

The reality is that both of these devices are great at what they do -- it’s really just a matter of preference. If you want crisp, clean images, added versatility, and don’t mind the extra size and charging, the FLIR One is your choice.

If you want a thermal imager that is easy to carry around and much more mobile when it comes to operation, the Seek Compact is best for you.

Either way, it’s hard to go wrong.

About the Author Rob Carson

I work in commercial construction, in Dallas, TX.

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