Molekule Air Mini+ review: high-grade filtering doesn’t offset this air purifier’s performance problems

The Molekule Air Mini+ is a small but innovatively designed air purifier. It boasts medical-grade materials and patented PECO filter technology, using UV radiation to help further destroy airborne pollutants.

I tested it to see whether it could compete with our pick of the best air purifiers on the market. It's simple to use and has an aesthetically pleasing app, but the only data that gets recorded is the air quality, in a range running from Good to Very Bad. This means that, unlike some cheaper air purifiers, there's no breakdown of the type of particles contaminating the air. In addition, the Molekule Air Mini+ can't detect VOCs (volatile organic compounds), making it hard for this purifier to tackle odors without manual intervention.

Note: the Pro version of this purifier does detect VOCs and is particularly good at tackling odors, but that model is significantly bulkier and more expensive (read my Molekule Air Pro review for more on that one). Alternatively, read on for my full Molekule Air Mini review below.

Molekule Air Mini+ review: price & availability

• List price: $359.99
• Only available in the US at present

At $359.99, the Molekule Air Mini+ isn’t cheap. You’d be forgiven for thinking that this must mean it’s packed with features, but Molekule has kept things seemingly simple with this model. Perhaps too simple, in my opinion, as cheaper alternatives can give more detailed readings.

What this purifier does have in comparison to these lower-priced alternatives, however, is patented PECO technology. This allegedly breaks down organic matter at a molecular level. While I can neither confirm nor deny that this is accurate, this, along with the use of medical-grade polycarbonate, would go some way to explain why the price point is as high as it is.

But I found myself asking: is this quality filter being used to its full potential if the Air Mini+ can't detect VOCs in order to respond appropriately in the first place?

The Air Mini+ is available to purchase directly from the Molekule website and on Amazon, but only in the US at present.

• Value for money score: 3 out of 5

Molekule Air Mini+ review specs

Molekule Air Mini+ review: design

• Simple aesthetic
• Redundant handle
• One-button control

Air purifiers can vary aesthetically: some look utilitarian while others make a statement, and the Molekule Air Mini+ sits somewhere in the middle. It has some fancy little design elements but, overall, I’ve gotta say, it’s kinda giving bathroom trash can vibes. That being said, it is at least a fairly compact size, standing at 12 inches tall, with a diameter of just over 8 inches. It’s surprisingly heavy for its size, weighing 7.3 lb, which is 4.8 ounces heavier than the much larger Shark NeverChange air purifier.

The white medical grade polycarbonate outer has a textured matte finish, with the word Molekule inlaid in shiny silver. On the right-hand side, a somewhat redundant tan-colored vegan leather handle is fixed in place by a large silver metal pin. It wasn’t easy or practical to carry it around using this, so it appears to be more of a design choice to keep it in line with the design concept of its larger sibling, the Molekule Air Pro.

There’s an inset gray band toward the bottom of the unit where the base meets the top section, and slanted gray slats at the top of the purifier circling the gray touch panel in the center. The control panel is subtle as no lights are on show until you touch the center to awaken the purifier. This center button is used to turn the power on and off, cycle through Auto Protect and manual fan modes, and reset the Air Mini+. In the middle of this button is the indicator light for the air quality in the room, it shows green for good, yellow for moderate, red for bad, and blue for very bad.

A series of white dots indicate the fan level, so one dot for the lowest fan speed, and five for the highest. It also shows an interlinked symbol when it’s in Auto Protect mode. There’s a Wi-Fi symbol that flashes up upon startup or if there are connectivity issues and a filter symbol that communicates the filter’s health.

In terms of packaging, the Air Mini+ comes in a shipping-style corrugated cardboard box, with consideration going into the cardboard fitments, eliminating the need for single-use materials like polystyrene. For extra protection, the purifier comes in a good-quality reusable drawstring bag.

• Design score: 4.5 out of 5

Molekule Air Mini+ review: features

• Aesthetically pleasing app
• Lacking detailed air quality data
• Impressive (but expensive) filter

The Air Mini+ is compatible with the Molekule app, which has an attractive and easy-to-use interface with a cool-toned color palette and animations. Despite the app being simple to use, setting up the Wi-Fi connection was a bit of a headache, but I’ll regale my woes further in the performance section.

Once everything was connected, the Purifier tab on the app told me what the current IAQ was, from good to very bad. From this tab, I could also change between Auto Protect mode, or manually select a fan speed from one to five. There's also a percentage rating to show the PECO-Filter condition: when pressed, it provides further information on the filter capabilities and details on how to change it. In the More tab, you can connect to Alexa, add more air purifiers to the app, and enable or disable notifications.

The Indoor Air tab shows a timed graph spanning 24 hours or one week. Unlike this purifier’s larger (and much more expensive) sibling the Molekule Air Pro, there is very limited information provided by the Air Mini+. You simply see a graph that notes the IAQ using the same color-coded system as shown on the purifier itself, and the length of time the air quality was at that level. There's no details on whether the IAQ was affected by dust particles, pollen, smoke, volatile organic compounds (VOCs), and so on. Perhaps this is enough information for some users, but when air purifiers that cost at least $100 less can provide more detail, it’s quite disappointing that the readings are so basic from the Air Mini+.

The Molekule Air Mini+ has received FDA clearance and is classed as a device intended for medical purposes. It’s stated that it can capture 95% of particulate matter and destroy bacteria and viruses by exposing them to ultraviolet radiation – though only when in manual mode on fan speed three or above.

The Air Mini+ comes with a PECO-HEPA Tri-Power Filter, which Molekule states can destroy bacteria, mold and allergens, and reduce odors and toxic gasses, with a 99.97% particle-capture efficiency rate. Molekule recommends changing the filter every six months, which doesn’t sound excessive, but it’s important to note that a replacement filter costs $99.99, or $79.99 if you subscribe to bi-annual deliveries.

• Features score: 3 out of 5

Molekule Air Mini+ review: performance

• Buggy Wi-Fi connectivity
• IAQ tracking not accurate
• Does not clear odors automatically

Having tried out many lower-cost purifiers and the Air Mini+’s highly talented sibling, I expected great things from this little purifier. The results from everyday use didn’t blow me away, unfortunately.

Upon initial setup at home, I couldn’t connect the Air Mini+ to my iPhone 12 Pro. I found that I needed to manually go into my Wi-Fi settings to find the Molekule Wi-Fi the purifier was trying to connect to. This action wasn’t prompted or made clear; on the app, a button just appeared asking to connect to the Molekule network, which would then throw up an error saying that it was unable to join. Once I’d discovered that I needed to join this network manually, my phone connected to the purifier.

Sadly, this wasn’t the end of the frustration. When it came to connecting the Air Mini+ to my Wi-Fi router, I was left with the spinning wheel of doom until I had to give up. I tried resetting the purifier, reinstalling the app, and restarting the Wi-Fi, but to no avail. I ended up admitting defeat late in the evening, which meant that even though the Air Mini+ was running overnight, it was not collecting any data. The only indication of the air quality was the colored indicator light on the top of the unit, which turns off until you touch it, so it wasn't easily visible from my bed. It’s unusual not to have Bluetooth backup available. I found this alternative connectivity option helpful when the lower-priced Welov P200 Pro wouldn’t connect to Wi-Fi, as at least it could still record data and be controllable as long as the device was in range.

I decided to test the syncing process with our OnePlus Pad Go, to see if this was an iOS, app, or firmware issue. Upon installing the Molekule app, it became clear that it wasn’t optimized for Android tablets, or certainly not in this instance anyway. The Auto Protect and Manual button on the Purifier tab went beyond the edges of the screen, and the chart in the Indoor Air tab didn't display properly, in either screen orientation. I couldn't use the OnePlus Pad Go to connect the Air Mini+ to the Molekule app again, as the page was too large for the screen, so it wasn't possible to go through the connection process.

When I tried to connect it to the Wi-Fi in the office the next morning, it was the same fun and games, until eventually, the app said that there was an issue connecting to the network and to try to reconnect. When I pressed the button to continue, it successfully connected to Wi-Fi and I was able to name my purifier on the app. I had the same issue when setting up the Molekule Air Pro, but it surrendered much quicker than the Air Mini+.

The biggest issue with the Wi-Fi not connecting was that, despite the price, the Air Mini+ doesn’t use Bluetooth, so if you can’t connect over Wi-Fi, the IAQ isn’t tracked and you can’t adjust settings hands-free.

One element that's been a cause of irritation for myself and my colleagues is that when switching between manual mode and Auto Protect, the fan speed builds up to its highest (and loudest) setting, even when the air quality is good. This isn’t great at the best of times, but if you’ve forgotten to set it onto auto when your baby is napping, or you’re in a quiet shared office, say, it’s very inconvenient. It was particularly off-putting when going to bed late at night, as it became more apparent to me that it took the fan some time to reduce to its final speed when I put it onto auto, even though it had only been on manual for a moment and the IAQ was good, meaning that the fan noise is loud for longer than it needs to be.

When using it in the TechRadar reviews office, the readings did not correspond with the Molekule Air Pro I had running simultaneously. The Air Pro detected a substantial drop in air quality on two occasions, which was when there was a lot of activity in the office. The reason that the two Molekule purifiers didn’t correspond with one another is simple – the Air Pro can detect an increase in VOC, but the Mini+ lacks this ability. While this can’t be held against the Mini+ due to the massive price difference between the two, before settling on a purifier you should consider the contaminants you want to be detected so that your purifier can react and clear the air fast.

I sprayed dry shampoo toward the Air Mini+ and it detected it quickly. The fan sped up gradually as a result, changing the IAQ from bad back to good within two minutes. The fan speed slowed gradually, even though the fragrance remained strong in the air. I manually set the purifier to full fan speed to clear the fragrance from the dry shampoo, it took the Air Mini+ about 30 minutes to clear the air. This is more than double the time it took the AiDot Welov P200 Pro, which left the air smelling fresher after just 10 minutes of running on full power.

One issue that became apparent is that the app does not always correspond with the reading on the purifier itself. When performing the dry shampoo test in the TR office it relayed the change in air quality after some time, but when I retested at home, it didn't register that the Air Mini+ was detecting bad air quality at all, relaying a fairly flatline reading of “good” over the whole day. While this isn’t the end of the world, as the purifier itself still reacted, it’s not ideal if you want to keep track of the air quality remotely or in the morning after a night's sleep, as the data does not feel reliable.

• Performance score: 2.5 out of 5

Should I buy the Molekule Air Mini+?

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Molekule Air Mini+ review: Also consider

How I tested the Molekule Air Mini+

• I used the Molekule Air Mini+ for one week
• I tested it in multiple environments
• I observed its reaction to aerosols

I tested the Molekule Air Mini+ in the TechRadar reviews office and music testing room, as well as in my bedroom at home.

I monitored how effectively it detected and purified airborne contaminants such as dust and dry shampoo, and how well it tackled the strong fragrance left by the latter.

I left it running in my bedroom overnight to determine whether it disturbed my sleep. I tested the sound levels using a sound level meter on my phone and assessed the controls and how easy it was to change the filter.

• First reviewed: August 2024
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