Just wanted to take the time to review this, honestly and without leaving anything out.

This device is very useful for checking for hot/cold differences (like if your gaming laptop is overheating or air conditioner isn't cooling enough). The FLIR ONE app is easy to use, but the guides on how to find home heating issues (air leak, insulation issues, or moisture detection) require a yearly subscription (in USD, $29.99).

The actual imagery is really good (for now, at least). Like others have said, there's two cameras: one visible spectrum, the other infrared-sensitive. One reviewer wrote that there's no option to adjust the superimposition of the visible-spectrum image; i can tell you right now this is dead false. On the bottom left of the screen is an icon of two offset squares; this is the alignment adjustment. No taping over the visible-spectrum camera is needed.

I do want to mention that this device seems to be better suited to close-up examinations (like up to 5-10 feet) and objects get less recognizable the farther you go. Remember, this is just like any other lensed product: it has a focal distance and range in which it works best.

CONS: battery life is about 1 hr. Not great, but come on, a device this small, what did you expect? Then again, maybe FLIR could have engineered it to work off the phone's battery, but it would still drain battery; at least it only takes 40 minutes to charge, which should be enough during a drive between job sites if you're a HVAC contractor. Another CON: it takes about 20 secs to power up and connect; the manual and the app do mention this downtime, so anyone complains about the load time from this point on is just being ignorant. Again, all devices have some bootup time, even your smartphone or TV.

Oh, and before I forget, yes, you CAN flip it around and take selfies with it! (See attached selfie)

The range on it is pretty short, and it tops out at 150C so this is strictly for household/casual use. It's helpful to find pets in the dark, and if you ever smell pee, it will show up as a dark spot on thermal making it super easy to find. It also indicates insulation issues, like when I look at my front door I can see a bright ring around it, indicating that there's a lot of heat coming in from the edges.
The downside, it takes a long time to load up. Sometimes after several minutes I'll give up, restart the app, and then suddenly it connects in 10 seconds. (which for it, is fast) Frame rate is very choppy, and the image is prone to just seizing up for a couple seconds every now and then. Also even though there's an adjustable knob on the camera, if you use an Otterbox or any heavy-duty phone case, it won't fit. You'll either need to remove the case every time you want to use the FLIR, or get a USBC extension cable and hold the camera in one hand, phone in the other. Also I've noticed it does not handle reflective surfaces very well. As an example I had a pot on the stove and the FLIR was telling me it was only 22C. I pressed an instant read thermometer up against it, and it was closer to 50C. That is a HUGE discrepancy, and the only thing I can think of is that it's shiny and polished. So it was probably picking up the heat from whatever was reflecting off it, which would've been ambient light from the room, and the room was about 22C. So while it was interesting to see how thermal imaging differs from visual light, it does show off that this thing is prone to making mistakes.

I recently purchased the FLIR ONE Gen 3 - iOS - Thermal Camera for Smart Phones, and let me tell you, it's a game-changer! This little gadget has transformed my world into a colorful, thermal wonderland.

At first, I was skeptical about the capabilities of a thermal camera for my phone, but this little gem has exceeded all of my expectations. The MSX Image Enhancement Technology is a game-changer, allowing me to see things in thermal imaging that I never thought possible. It's like my own personal superpower!

One of the first things I did with my FLIR ONE was to take it on a ghost hunt with some friends. We were exploring an old abandoned building, and the FLIR ONE picked up all sorts of strange heat signatures. We found out that the ghost we were looking for was actually just a raccoon living in the attic, but it was still a fun experience nonetheless.

I've also used the FLIR ONE to investigate some strange noises coming from my attic. I was convinced that there was some sort of monster living up there, but it turns out it was just a pesky squirrel. Thanks to the FLIR ONE, I was able to see exactly where it was hiding and evict it from my home.

But the real fun with the FLIR ONE is just exploring the world around me. I've used it to see where my cat likes to sleep during the day (turns out it's on top of the fridge), to see which of my houseplants are getting the most sunlight, and to check the temperature of my coffee (because who doesn't want to know that?).

Overall, I give the FLIR ONE Gen 3 - iOS - Thermal Camera for Smart Phones five out of five stars. It's a little pricey, but it's worth every penny for the endless entertainment and utility it provides. Plus, it makes me feel like a superhero, and who doesn't want that?

Here's a comparison between the FLIR ONE Gen 3 for iOS and the SEEK Compact Pro Thermal Imaging Camera:
FLIR ONE Gen 3 - iOS - Thermal Camera for Smart Phones:
* Thermal sensor resolution: 80x60
* Temperature range: -4°F to 248°F (-20°C to 120°C)
* Field of view: 55° x 43°
* Minimum focus distance: 0.5 meters
* App compatible with iOS devices
* Battery life: up to 1 hour
SEEK Compact Pro Thermal Imaging Camera:
* Thermal sensor resolution: 320x240
* Temperature range: -40°F to 626°F (-40°C to 330°C)
* Field of view: 32°
* Minimum focus distance: 15 cm
* App compatible with iOS and Android devices
* Battery life: up to 4 hours
As you can see, the SEEK Compact Pro has a much higher thermal sensor resolution than the FLIR ONE Gen 3, which means it can provide more detailed thermal images. It also has a wider temperature range and longer battery life. However, the FLIR ONE Gen 3 has a slightly larger field of view and a shorter minimum focus distance, which may be useful in certain applications.
In terms of compatibility, both cameras have apps that are compatible with iOS devices, but the SEEK Compact Pro also has an app that is compatible with Android devices.
Overall, the SEEK Compact Pro is a more advanced thermal imaging camera with higher resolution and better features, but it is also more expensive than the FLIR ONE Gen The choice between the two will depend on your specific needs and budget.

I purchased this device because I can see spoors of mold on my wall. When I use the thermal camera I was correct I found mold inside my walls and areas I did not know. Camera is great and a perfect size. It comes with case for the camera and the plug. This device is worth the price. What I love most is that it attaches right to your phone. You can save all the videos on your phone. 10/10 for this device.

It was pretty easy to get setup - with one little snag. (I had to toggle the camera type in the app to get it to detect the camera, which I think many may not try... and would think it didn't work). It is a low resolution camera and the dynamic range isn't the best, but for the price, I think works very well. So many uses for this little camera... looking for hidden cameras in airBNBs, looking for water leaks, searching for critters in the dark...

It's super portable, easy to use and actually gives you a pretty good image - which gets line drawing overlay via the visible spectrum camera. It even comes with a little case.