Right off the bat, the 4000 series of Osaki, a popular massage chair brand, is packed with many high-end and high-tech features that most people are looking for.
To help you decide which model to buy, our Osaki OS 4000 massage chair review will give you a closer look at the features of each series model, particularly, the OS 4000, OS 4000T, OS 4000 LS, and OS 4000 CS.
In addition, we included a quick review of the less expensive Osaki OS 3000 massage chair to see how it compares to the OS 4000 series.
Osaki OS 4000 Massage Chair Comparison Chart
Osaki OS 4000 Massage Chair Models | 
OS 4000 | 
OS 4000T | 
OS 4000LS | 
OS 4000CS |
Adjustable Shoulder Width | ✘ | ✘ | ✓ | ✓ |
Airbags | 38 | 38 | 24 | 24 |
Air Massage (Arms) | ✓ | ✓ | ✓ | ✓ |
Air Massage (Foot and Calf) | ✓ | ✓ | ✓ | ✓ |
Air Massage (Hip and Lumbar) | ✓ | ✓ | ✓ | ✓ |
Air Massage (Shoulders) | ✓ | ✓ | ✓ | ✓ |
Automatic Recline | ✓ | ✓ | ✓ | ✓ |
Automatic-Off Timer | ✓ | ✓ | ✓ | ✓ |
Body Scan | ✓ | ✓ | ✓ | ✓ |
Full-sized Remote with LCD screen | ✓ | ✓ | ✘ | ✘ |
Intensity Control for Air Massage | ✓ | ✓ | ✓ | ✓ |
LED Handheld Remote | ✓ | ✓ | ✓ | ✓ |
Heat Therapy (Lumbar Area) | ✓ | ✓ | ✓ | ✓ |
L-Track System | ✘ | ✘ | ✓ | ✓ |
Manual Operation Mode | ✓ | ✓ | ✓ | ✓ |
Massage Programs (Presets) | 8 | 8 | 6 | 6 |
Massage Styles | 6 | 6 | 4 | 4 |
Ottoman, Automatic Leg Scan | ✓ | ✓ | ✘ | ✘ |
Ottoman, Spring-Loaded | ✘ | ✘ | ✓ | ✓ |
Roller Speed Control | ✓ | ✓ | ✓ | ✓ |
Roller Length (inches) | 30" | 30" | 42" | 42" |
Vibration Seat Massage | ✓ | ✓ | ✓ | ✓ |
Space Saving Recline Track | ✘ | ✘ | ✓ | ✓ |
Spinning Foot Rollers | ✘ | ✓ | ✓ | ✘ |
S-Track System | ✓ | ✓ | ✓ | ✓ |
USB Port | ✘ | ✘ | ✓ | ✓ |
Wireless Remote | ✓ | ✓ | ✘ | ✘ |
Zero Gravity Mode | ✓ | ✓ | ✓ | ✓ |
Osaki Os 4000 Massage Chair Models |
|---|
OS 4000
RATING | |
|---|---|
Adjustable Shoulder Width | ✘ |
Airbags | 38 |
Air Massage (Arms) | ✓ |
More Specifications...
Osaki Os 4000 Massage Chair Models |
|---|
OS 4000T
RATING | |
|---|---|
Adjustable Shoulder Width | ✘ |
Airbags | 38 |
Air Massage (Arms) | ✓ |
More Specifications...
Osaki Os 4000 Massage Chair Models |
|---|
OS 4000LS
RATING | |
|---|---|
Adjustable Shoulder Width | ✓ |
Airbags | 24 |
Air Massage (Arms) | ✓ |
More Specifications...
Osaki Os 4000 Massage Chair Models |
|---|
OS 4000CS
RATING | |
|---|---|
Adjustable Shoulder Width | ✓ |
Airbags | 24 |
Air Massage (Arms) | ✓ |
More Specifications...
Details on Osaki OS 4000 Massage Chair Model
Osaki OS 4000
Starting off with the Osaki OS 4000 massage chair, this is one of the most popular models from the Osaki product line. With its wealth of features and luxury aesthetics, it’s not really hard to figure out why.
Ergonomic S-Track
First, the Osaki 4000 massage chair is ergonomically designed with an S-Track system to provide optimal comfort and contour to the spine.
Since spine curvature varies from one person to another, the S-track system enables the rollers to move from the neck to the lower back without losing pressure or support along the way or at either end — which is an often occurrence among linear track systems.
With this in mind, the S-Track system is found on all 4000 series models. Check out the Osaki OS 4000 Massage Chair Comparison Chart below.
Two-Stage Zero Gravity
Perhaps one of the most interesting and often misunderstood features that any Osaki OS 4000 massage chair review must discuss is the zero gravity function.
Inspired by technology from the National Aeronautics and Space Administration (NASA), the Osaki OS 4000 is able to recline the body into a neutral position at the push of a button, which consequently reduces vertical pressure on the spine, helps muscles relax, and maximizes the intensity of the massage.
Moreover, there are two stages of zero-G available on the Osaki OS 4000 zero gravity full body massage chair whereby the difference between the two is the level of recline. In the second stage, the greater level of recline positions the legs above the heart allowing for better circulation and greater massage intensity.
Body Scan
By utilizing the latest technology, the rollers in the Osaki 4000 can perform a body scan to determine the shape and size of the user before initiating a massage. Upon getting an accurate information about the user's back curvature, the chair automatically adjusts to provide a highly precise and customized massage.
Air Massage Technology
Due to the advancements in Osaki's airbag engineering, the Osaki 4000 has efficiently reduced the overall number of airbags used while increasing the amount of surface area covered. By all means, fewer airbags produce less noise and consume less power, resulting in a more relaxing, more efficient, and more natural-feeling massage experience.
Plus, Osaki has upgraded its airbag materials to industrial-grade for more durability without skimping on comfort.
Explicitly, the airbags provide air massage to the following areas:
- Shoulders
- Hips and Lumbar
- Feet and Calves
Automatic Leg Scan and Length Adjustment
To account for leg length variation among users, at the start of the massage, the Osaki 4000 calf and foot massager automatically adjusts itself according to the user's leg length. This not only enhances comfort, but ensures the massage is concentrated on the correct areas.
The automatic leg scan feature is only found on the OS 4000 and OS 4000T models.
Heat Therapy
Two heating pads located on the Osaki 4000 massage chair provide heat to the lower back for increased muscle relaxation and rejuvenation.
Gentle Vibration Massage
High-frequency massage plates located on the seat of the Osaki OS 4000 provide a gentle vibration massage to the thighs.
Different Massage Programs and Styles
The OS 4000 offers eight different preset massage programs and six massage styles.
Preset Massage Programs:
Massage Styles:
Intensity Levels and Speed Control
On the Osaki OS 4000 massage chair, there are five levels of intensity with five different speeds, giving the user complete control over both the airbag massagers and rollers.
Manual Mode
Enabling users to have full control over their massage experience, the Osaki OS 4000 offers a manual mode function. By pressing a few buttons, users can dial in their ideal massage by choosing the massage style, intensity, speed, body areas to target, and massage duration of their preference.
Two Remote Controls
The OS 4000 features a full-sized, easy-to-use remote control with a large LCD display screen that shows which chair functions are activated.
On the main remote, under a flip down cover, the buttons for the manual mode are found. While on the top right of the main remote, a hand-held wireless remote is available for users to easily operate the chair while in a reclined position.
Only the OS 4000 and 4000T models feature a full-sized remote. See the Osaki OS 4000 Massage Chair Comparison chart below.
Auto-Off Timer for Safety
Another great feature of the Osaki OS 4000 massage chair is its auto-off timer that ensures the chair shuts down automatically if not turned off by the user, like in the event a user falls asleep during a massage. Easily set the timer from 5 to 30 minutes and have the peace of mind from this safety feature that’s a standard on all OS 4000 series models.
Osaki OS 4000 Massage Chair Specifications
Osaki OS 4000T
Now that we’ve delved into the features of the Osaki OS 4000, let’s take a look at the OS 4000T. The Osaki OS 4000T massage chair is almost identical to the OS 4000 with the exception of the following compelling feature:
Reflexology Foot Massagers
Besides having airbag massagers at the foot and calf section like the OS 4000, the Osaki OS 4000T features additional two rows of reflexology massagers that spin along the bottoms of the feet.
These massagers stimulate acupressure points that when combined with the calf air massage, produce a deep and invigorating calf and foot massage.
Only the OS 4000T and OS 4000LS models offer the reflexology foot massager feature.
Osaki OS 4000T Massage Chair Specifications
Osaki OS 4000 LS
The Osaki OS 4000 LS massage chair has many of the same features of the OS 4000 and 4000T models. However, for individuals who need extra space in and out of the chair, the OS 4000LS has added features making it a not-to-miss model.
L-Track System for Greater Massage Lengths
First key feature of the Osaki OS 4000 LS massage chair is how it combines the spine-contouring benefits of the S-track system with the lengthening benefits of the L-Track system.
With its L-Track system, the rollers on the OS 4000LS cover a whopping 42 inches from the neck to the buttocks.
Adjustable Shoulder Massager Width
Another premiere feature of the Osaki OS 4000 LS is its adjustable shoulder massagers. It has three shoulder width options making it easy to find a good fit and accommodate users of different sizes.
Side-Arm Air Massage
Next distinctive feature of the Osaki 4000LS model is its arm air massager. Instead of covering the tops and bottoms of the arms like the air massagers on the OS 4000 and OS 4000T, the arm air massagers on the OS 4000LS provide compression massage to the sides of the arms and wrists.
Spring-Loaded Ottoman
Although its lacking the automatic leg scanning technology of the OS 4000, the OS 4000LS uses a spring-loaded ottoman that allows users to adjust the chair’s length simply by pushing their legs out.
Most often used when transitioning from a seated to a reclined position, this feature is a great option for tall individuals who need more flexibility with leg length in the ottoman.
Reflexology Foot Massagers
Like the OS 4000T, the Osaki OS 4000 LS features two rows of spinning massage rollers located on the foot portion of the chair. These rollers deliver a reflexology-type massage that applies pressure to specific areas of the feet.
Preset Deep Tissue Massage
Unlike the OS 4000 and OS 4000T where users are required to be in manual mode and in the reclined zero gravity position to be able to enjoy a deep tissue massage, the Osaki OS 4000 LS massage chair offers deep tissue massage preset programs — no reclining necessary.
Space-Saving Track Technology
Users who have limited space in their homes but still want the benefits of a high-quality massage chair, will enjoy the space-saving feature offered by the Osaki OS 4000T.
While most massage chairs require ample space behind the chair in order to recline, the OS 4000LS uses a recline track specially designed to move the massage chair forward as it goes back, resulting in a much more space-efficient chair. In fact, four inches of space behind the chair is all that’s needed for it to fully recline.
Handheld Remote with LED Screen
Although the Osaki 4000LS doesn’t come with a full-sized remote, it does have an easy-to-use handheld remote and an easy-to-see LED screen. Easily select from a variety of preset programs, manual mode options, massage intensities, and speed levels — all can be done using the handheld remote.
Plus, the handheld remote allows the user to make massage adjustments while in the reclined position comfortably. When done, simply place the remote in its holder located on the arm of the massage chair.
USB Port for Device Charging
Users who want the option to charge their mobile devices while getting a massage will appreciate the USB port on the Osaki OS 4000 LS. Located on the arm of the OS 4000LS, next to the handheld remote, the USB port lets users connect and charge their phones or any other USB-compatible devices while enjoying their favorite massage.
Osaki OS 4000 LS Massage Chair Specifications
Osaki OS 4000 CS
The OS 4000CS massage chair closely resembles the OS 4000LS model. In fact, the two are nearly identical with the exception of just one feature.
No Reflexology Foot Massagers
Unlike the OS 4000T and OS 4000LS, the Osaki OS 4000CS has no spinning reflexology massagers in the foot area of the chair. While all the other features on the OS 4000CS are same with those found on the Osaki 4000LS, users who are looking for extra foot support may find the lack of reflexology foot massagers on the OS 4000CS a major deal breaker when choosing between the two models.
Osaki OS 4000 CS Massage Chair Specifications
Osaki OS 3000 vs. OS 4000
It’s no secret that investing in wellness products such as massage chairs pays dividends in physical and mental well-being. But even so, it’s still an investment and can be a big one at that.
For those wanting a massage chair with some of the same high-quality and high-tech features we cited in our Osaki OS 4000 massage chair review but with a smaller price tag, the OS 3000 might offer a comfortable compromise. Check out the features of the Osaki OS 3000 below and how they compare to the OS 4000’s.
Extended Roller Track
Although not as long as the L-Track system on the OS 4000LS and OS 4000CS, the Osaki OS 3000 massage chair boasts a 36-inch roller track system, allowing the massagers to extend from the neck to the thighs, providing massage treatment past the tailbone and into the seat of the massage chair.
Computer Body Scan
When a user sits on the Osaki OS 3000 massage chair, the chair’s body scan program kicks off. This scan allows the massage rollers to map and determine the curvature of the user’s spine, resulting in a highly customized massage.
This program is also found on the OS 4000.
Width Adjustment for Massage Rollers
What makes the Osaki OS 3000 massage chair totally unique is its roller width adjustment feature which allows the user to adjust the roller width from narrow to wide during massages.
Zero Gravity Recline Position
Just like the Osaki OS 4000 models, the OS 3000 features the zero-gravity reclined position which helps to relax the muscles in the back and along the spine as well as increase massage intensity.
Removable Backrest Pads
Unique to the Osaki OS 3000 massage chair, users can increase the intensity of a massage by simply taking out the removable memory foam backrest pads. Although not as simple as pushing a few buttons like with the OS 4000 series models, the removable pads are effective.
Vibration Plates for Gentle Massage
In the seat area of the OS 3000, like those found on the OS 4000 model, are high-frequency vibration massage plates which provide a gentle massage to the thigh area.
Presets: Massage Programs and Styles
Like the OS 4000 series, the OS 3000 features five massage styles. However, the massage styles available on the OS 3000 are Swedish, Shiatsu, Dual-Action, Tapping and UNIQ. A UNIQ massage is designed to target the buttock and thighs, which is not offered on any of the Osaki OS 4000 models.
The OS 3000 features four preset massage programs: Neck, Feet, Classic I, And Classic II. Classic I uses a mix of kneading and tapping to massage the neck and buttocks, while Classic II focuses on the lower back using a combination of tapping and rolling massages.
Altogether, all four programs can cover the most commonly targeted body regions. However, they aren’t as extensive and theme-specific as those found in the OS 4000.
Blue Chromotherapy Lighting
Chromotherapy is a form of color therapy used to stimulate healing within the body. On the OS 3000, LED strips located on the sides of the chair emit blue light.
Blue chromotherapy lighting is thought to promote calmness, relaxation and aid in the relief of headaches and general pain. This feature is only found on the OS 3000 and other higher-end massage chair models in the Osaki line.
Manual Mode
Besides the preset programs, the Osaki OS 3000 massage chair also features a manual mode that allows users to customize a massage to their own liking. Choose from massage styles, intensities, and body areas to dial in the perfect massage.
Handheld Remote with LED Screen
The Osaki OS 3000 features a newly designed remote that’s handheld with a vibrant LED screen. This remote is easy-to-use, has a vibrant display that allows the user to easily see which massage programs which are active, and is a slimmer version of the handheld remotes found on the OS 4000CS and OS 4000LS models.
Osaki OS 4000 Massage Chair Review Conclusion
In this Osaki OS 4000 massage chair review we have covered four of Osaki’s most popular 4000 series massage chairs, plus the less expensive OS 3000 model. After taking an in-depth look at the side-by-side features of each model, we hope you learned more about the massage therapy benefits you can get from these chairs, and eventually find the ideal massage chair that you’d want to bring home.
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