Osaki OS-4000 Massage Chair Review 2023

With its innovative technology and wide range of options, the Osaki OS-4000 massage chair is a really sophisticated massage chair. The chair uses airbag technology, engineered to mimic the sensitive touch of human hands, and is designed to reduce gravitational pressure on the user’s back, creating a state of deep relaxation. The speed and intensity are also easily adjusted, and body scan technology ensures that the user receives a massage which is sensitive to their shape.

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Osaki OS-4000 features

Below are some the the features of the OS-4000 that really make it stand out. There are definitely a lot more features on this massage chair, but we thought these were the most compelling for potential buyers. You can find more about these features and learn more about the chair by checking out the Osaki OS-4000 owner’s manual.


‘S-Track’ design

The shape of the Osaki OS-4000 has been designed to comfortably match the curvature of the spine, particularly the lumbar area. This makes the chair exceptionally relaxing to rest in, and also helps to increase the effectiveness of the massage.

Zero gravity technology

Osaki OS-4000 zero gravityThe Osaki OS-4000 features zero gravity positioning, which minimizes pressure on the user’s spine. This is a particularly nice feature, and helps to create a feeling of weightlessness and relaxation, particularly in the back and neck. The manufacturer claims that zero gravity technology helps to correct spinal alignment, reduce stress on the heart and even boost lung capacity.

Computer body scan technology

The rollers of the Osaki OS-4000 scan the body before beginning the massage to create a massage that is suited to the user’s body-type. This cutting-edge technology automatically adjusts according to the shape and size of the person in the chair, so they receive a massage which is tailored to their needs.

Innovative airbag technology

Osaki OS-4000 air bags and rollersThe Osaki OS-400 has been engineered to minimize the number of airbags while maximizing the amount of surface space they cover. The result is massage chair which is mechanically very smooth, which feels more like a natural massage. Additionally, the twin-rollers are designed to replicate the sensation of human touch.

Two controllers

The Osaki OS-4000 features a large main remote, so you can effortlessly browse through the various massage options. The main remote serves as the primary means of controlling the chair but it also has a wireless controller so you can easily control the chair’s main functions, even when you’re in a reclining position.

Osaki OS-4000 remote


  • Hip and shoulder air massage
  • Five speed and intensity levels
  • Zero gravity design to minimize stress on spine
  • Vibrating seat massage
  • Six automatic massage programs: Healthcare, Relax, Therapy, Smart, Circulation and Demo
  • Adjustable calf rest
  • S-track design to match the shape of the user’s spine
  • Complete upper and lower body massage
  • Body scan technology
  • ‘Human hand’ massage
  • Adjustable width
  • Available in 4 colors


  • Chair is set to shut down after 30 minutes
  • Like many high-end massage chairs, the Osaki OS-4000 is large and heavy
  • Massage may be too intense for some users


What’s missing?

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The Osaki OS-4000 has a wide range of great features which can be adapted to suit your needs and preferences. However, although the Osaki OS-4000 covers most bases, there are areas where it is lacking.

Fitness enthusiasts, for example, may be disappointed not to find a recovery function, which is included in some massage chairs, including the Inada Sogno Dreamwave. This is a really useful massage program, which helps to relieve tired muscles after a hard work-out. Additionally, the Osaki OS-4000 doesn’t offer gentler massage sessions which are designed specifically for younger people, which may be discouraging for families.

While this chair’s extravagant appearance will impress some people, others may prefer the more streamlined appearance of lighter massage chairs, such as the iJoy Active 2.0 or others in the iJoy line of chairs. However, these chairs lack the Osaki OS-4000’s range of functions.

The Osaki SO-4000 offers a good variety of massage techniques, but you might be disappointed if you’re seeking a massage chair which offers some of the more obscure methods. Chairs such as the BestMassage EC-06c offer chop action tapping and flapping, which many users rate highly. The Osaki SO-4000 does not feature these.
Osaki OS-4000 front side recline

What customers think about the Osaki OS-4000 massage chair

The vast majority of reviews of the Osaki OS-4000 are very positive; one reviewer even describes the chair’s massages as ‘heaven’. The range of options and quality of the massage is widely praised. However, the Osaki OS-400 has not impressed everyone. A few critics focus on the size and weight of the chair, difficulties assembling it and difficulties using the controller, and one user said the massage was simply too strong, hurting his calf muscles.

However, four and five star ratings account for the majority of reviews of the Osaki OS-4000. One reviewer said the chair had done more to alleviate their pain than anything they had tried and called it ‘fabulous’. Another review says it is ‘a joy’ after a work-out. Other comments claim that the chair is well worth the fairly high price tag, and agree that it can alleviate various aches and pains.

In fact, generally speaking, reviews for the chair were highly positive, recommending it as a great option for those seeking a serious massage in the comfort of their own home.


  • Weight: 205lbs
  • Rated Power: 150 W
  • Voltage: 110 – 120
  • Dimensions:
    • Upright: 47â€(l) x 32â€(w) x 47â€(h)
    • Reclining: 76â€(l) x 32â€(w) x 47â€(h)

Owner’s manual for the Osaki OS-4000

If you are looking for even more details about the specifics of this chair you can take a look at Osaki OS-4000 owner’s manual. You can see how it’s installed and more details about all the features of this massage chair.

Warranty information

The Osaki OS-4000 comes with a three-year warranty which covers labor costs for the first year of ownership and parts costs until the end of the second year of ownership, at no extra cost.  The warranty does not cover shipping costs or general wear and tear.

Who the Osaki OS-4000 is for

The Osaki OS-4000 provides its user with a wide range of massage options, most of which can be subtly adjusted. As such, it is more appropriate for people who want to regularly use a massage chair and expect the luxuries associated with higher-end models.  This chair is ideal for those seeking long-term treatment for their aches and pains, and who have enough time to explore its many features.

Who this chair is NOT for

Due to the sheer number of possibilities offered by the Osaki-4000, it is not the best option for those who want a chair for basic or occasional use. Such users are likely to be put off by this model’s price tag, and may find it unnecessarily complex for their needs. Since the Osaki OS-400 lacks a massage feature designed especially for younger users, it may not be the best option for buyers who would like to let their children use it.


The Osaki OS-4000 if a great all-round massage chair with all the state-of-the-art features you would expect from a high-end model. It is designed to adapt to the preferences and body-type of its user for a sensitive and deeply relaxing massage.

Although it’s not the most streamlined chair, many will be charmed by the extravagant appearance of the Osaki OS-4000, and its looks reflect impressive engineering and cutting-edge technology. If you are looking for a more streamlined chair you might try the Panasonic EP-MA73. Massage connoisseurs looking for a sophisticated and highly versatile product will not be disappointed by the Osaki OS-4000.
Osaki OS-4000 colors

Nicholas Porter

Nicholas Porter provides honest and unbiased information about different massage chairs on the market to help people make an informed decision about which one is best for them. Nicholas has been a massage therapist for over 10 years and has tried out countless massage chairs in that time. He knows what to look for in a great chair and is passionate about helping others find the perfect one for their needs.

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