Okaysou Cayman 608 Air Purifier Review – A Hands On Test

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Our Rating:

Key Features:

Removes 99.97% of particles as small as 0.1 microns

40% Less Energy

Purifies a 1,000 sq ft room in just one hour

Extremely Quiet

Impressively Quiet Air Purifier Powerful Enough for Large Spaces

There is so much to love about the Okaysou Cayman 608 Air Purifier that it’s hard to know where to start. This powerful personal use purifier has a sleek and highly intelligent design that maximizes airflow while minimizing noise and power usage.

This thing is so quiet that you can’t even hear it on the lowest setting unless you’re standing right next to it. Don’t let that low noise output deceive you; this thing is efficient too. The H13 True HEPA filter removes 99.97% of particles as small as 0.1 microns from the air.

Combine that impressive noise reduction and highly-capable filter with a powerful Japanese DC motor, and you’ve got a machine capable of purifying the air in a 1,000 square foot house in just one hour.

Review Criteria Ratings

Air Purifying Performance4.5/5
Build Quality5/5
Maintenance and Upkeep4.5/5
Operating Costs5/5


  • H13 True HEPA filter
  • Energy Star Certified
  • 360-degree air intake
  • Super-quiet sleep mode
  • Light on/off button


  • No remote
  • Slightly large for counter use
  • One-piece filter

Should You Buy It?

If you’re constantly dealing with dust, dander, smoke, allergens, or pathogens inside your home, this is the purifier you want. The powerful True HEPA filter removes particles down to 0.1 microns and uses 40% less energy than its competitors, so you can feel good about leaving it running day and night.

Disclosure: This product was sent to us by the manufacturer for free in order for us to provide an honest review. However, this does not affect how we rate and review the product and all opinions are our own. We may earn commissions from any purchases made through links clicked on our website.

Okaysou Cayman 608 Air Purifier Overview

Packaging of Okaysou Cayman 608 Air Purifier

The Cayman 608 Air Purifier is one of seven air purifiers sold by Okaysou and their best option for large space personal use.

At the heart of this purifier is the H13 True HEPA filter that filters out allergens like mold and dander and smaller particles like smoke and cooking odors. This advanced HEPA filter can block particles as small as 0.1 microns, including most viruses and bacteria. The Cayman 608 can even trap droplets that viruses attach to

Whether you plan to use this purifier to reduce allergen exposure in the home or fight the spread of illness in the office, you can have peace of mind running it as often as needed.

Note: This purifier is Energy Star Certified and more energy-efficient than direct competitors. It is even CARB and FCC certified for safety.

In terms of functionality, this purifier has a lot to boast about. It is extremely quiet when set to the lowest of four fan settings, putting out just 22dB. Considering most purifiers run in the 40dB range on the lowest setting, this is seriously impressive.

unboxing the Okaysou Cayman 608 Air Purifier

It also features a timer function, four fan settings, including the ultra-quiet, lights-out sleep mode setting, a child lock, and the ability to turn all the control board lights off while in use.

Okaysou was launched in 2018. They sell a variety of home tech products, including robot vacuums, humidifiers, and air fryers. All their innovative tech is designed to improve their customers’ quality of life and bring them forward into the future.

The Cayman 680 certainly seems to fit that mold, but how does it perform in real life? I had the chance to test out this promising purifier. Keep reading to see my full Okaysou Cayman 608 Air Purifier review.

How It Performs

I was able to perform a hands-on test of the Cayman 680 purifier in my home. Here is my take on where this unit excelled and where it came up a little short.

Air Cleaning Performance

Okaysou Cayman 608 Air Purifier on the countertop

What has always bothered me about compact air purifiers is the limited space designated for air intake – a purifier can only purify as much air as it pulls through the filter. Surprisingly, this intelligently designed little unit definitely doesn’t have that problem.

The entire lower third of this round purifier’s body is covered in honeycomb holes that act as the air intake. This design allows a large amount of air to move through the unit at once. It can even pull air from all sides, maximizing its performance.

Once inside the machine, the air is pulled directly through an impressively large HEPA filter. This rounded filter resembles a car filter and uses the same wide surface area idea to continue to maximize airflow through the unit.

Okaysou Cayman 608’s filter on the countertop

The filter consists of three layers that work to pull particles from the air: 

  1. The first layer is a nonwoven prefilter that captures large particles like dust and hair. 
  2. The H13 True HEPA filter is the second layer responsible for removing 99.97% of particles down to 0.1 micron in size, including most viruses and bacteria. 
  3. The innermost layer is the honeycomb active charcoal filter that purifies the air of odors and smoke.

This powerful filtration system is combined with a wide air intake area and a Japanese DC motor to purify 1,000 square feet of space at 260 CADR in just 1 hour.

Even in the lower settings, you can feel the air moving not just out of the unit but also into it. The Cayman had no problem getting rid of cooking odors, removing the wildfire smoke that’s been plaguing my home all summer, and keeping the air free of stagnant odors and visible dust.

Overall, I was very impressed with how quickly and effortlessly this purifier cleaned up the air in my home.

Build Quality and Noise Level

Much of Cayman’s purifying ability comes from the intelligent way it was built. The large air intake, the intelligent motor system, and the smart filter setup all point to a well-designed product built with quality in mind. 

Plus, I would expect this unit to last for years because of its fewer external moving parts, touch-operated control, and single removable filter hatch. In case something does go wrong, the company offers an impressive 5-year extended warranty with product registration.

Info: A good measure of a purifier’s build quality is not just what it looks like but how it sounds.

The Cayman has four fan speed settings. On high, it is a little quieter than the average purifier at 51dB. On medium, you’ll have trouble hearing it if the fridge kicks on. On low, you can’t hear this thing unless the room is nearly silent.

For those times when the house is incredibly quiet, sleep mode is all you need. On this lowest setting, the Cayman puts out just 22dB. You can’t hear it unless you’re standing next to it.

Overall, I was impressed with the build quality of the Cayman 608 and how little sound it put out. I see this product as the perfect solution for people who want a way to purify their bedroom while they sleep but don’t want droning white noise interrupting their dreams.

Functionality and Usability

touch control panel of the Okaysou Cayman 608 Air Purifier

The touch operation control panel on the top of the unit makes switching between the many modes as simple as can be. You can cycle through the four fan speeds by clicking the fan button. When the selection reaches the sleep mode option, the lights on the unit turn off, and the motor slows to near silence.

You can also turn the lights on the control board off during everyday use by clicking the light power button. In lights-off mode, this purifier is completely dark and perfect for use in the bedroom.

A timer function also allows you to set the unit to run continuously or for 1, 2, 4, or 8 hours. This screen also includes a filter change reminder light and child-lock button.

These functions combine with a decently sized unit to create a highly usable machine. This purifier is a little bigger than your typical personal purifier but has a small enough footprint to fit on the kitchen counter or bedroom dresser.

Overall, I liked all the unit’s features but wished it came with a remote. I would have also loved to see an auto-mode function that adjusts the fan speed and turns the unit off depending on the quality of the air moving through it.

Maintenance and Operating Costs

a person holding the single-piece filter of Okaysou Cayman

The Okaysou Cayman uses a single-piece filter, a feature that I both like and don’t like.

Single-piece filters are problematic because they must be changed out based on the layer with the shortest lifespan. This often means trashing your filter while some of the layers still have some use left.

On the other hand, multi-piece filter systems allow you to use each piece until it is no longer viable and then buy a replacement. Of course, this can be a bit of a hassle because you have more pieces to buy and keep track of.

The good thing is the maintenance costs and workload with this purifier are very low. 

According to the website, the Cayman filter lasts for 180 days of continuous use. And, the replacements only cost about $35 and can be rinsed out to extend its life. So, despite having a single-piece filter, I’d say it’s still worth the investment. 

In terms of daily operations costs, it will only cost you just $0.08 to run for 24 hours on the highest setting. That’s less than the average operating costs for a purifier rated for rooms half the size of this one!

Alternatives to the Okaysou Cayman 608

Overall, the Cayman 608 is a great buy for those looking for an effective, quiet, and well-priced purifier for personal use in medium to large spaces. But if you are looking for something a little smaller or a little more powerful, there are some other great choices to consider.

For smaller rooms, the HomeLabs Purely Awesome Purifier is a great choice. This purifier has a cylindrical shape with a small footprint that makes it easy to place around the house. Plus, it can purify rooms up to 200 square feet.

If you need a more powerful unit meant to cleanse larger spaces or the entire house, the Alen BreatheSmart 75i is worth considering. This unit also uses an H13 True HEPA filter but is rated to remove up to 99.99% of particles from spaces as large as 1,300 square feet.

FeaturesOkaySou Cayman 608HomeLabs Purely AwesomeAlen BreatheSmart 75i
Coverage1,000 sq ft200 sq ft1,300 sq ft
Filter TypeH13 True HEPATrue HEPAH13 True HEPA
Noise level22 to 51 dB35 to 50 dB25 to 49 dB

Things to Consider Before Buying an Air Purifier

Before you commit to any air purifier, there are some things worth considering to help you find the right product to fit your needs.

  • The filter type. Standard filters are great for removing large particles like dander and dust. Charcoal filters are necessary for removing odors and smoke. HEPA filters remove small particles like allergens and pathogens and come with various ratings of effectiveness.
  • Coverage. Do you need a small purifier for the bedroom or a large purifier for the office or cleanse the entire house? To maximize purification and minimize energy use, look for a purifier that is rated for the same sized space you plan to use it in.
  • Noise level. Most purifiers max out at about 50dB on their highest setting, but only a few are designed with an ultra-quiet mode. Consider where you plan to use your purifier and how disruptive moderate white noise would be in that space.
  • Functionality. Purifiers come with a range of functions from timers to auto-mode. Some put off a lot of light, even on the lowest setting, while others have a shut-off light for bedroom use.  All these functions will determine if the unit has what it takes to meet your needs.


Air purifiers are an excellent investment for your health and are becoming increasingly important in a world plagued by VOCs, pollutants, and communicable diseases. An effective, affordable, and easy-to-use air purifier could be your ticket to breathing better and feeling better.

The Okaysou Cayman 608 Air Purifier is all of those things and more. 

This well-priced purifier comes with a powerful H13 True HEPA filter for removing allergens, pathogens, and odors from the air. It is also one of the quietest purifiers on the market and features a lights-out sleep mode for use in the bedroom, office, and any room up to 1,000 square feet.

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Sara Seitz is a freelance writer and novelist. She lives with her husband and wildling toddler in Colorado where she spends her days working on their house, gardening, and reconnecting with nature.

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