The catch
Steelcase Karman
Seat depth is fixed at 17.25-inch. Extra arm controls can't fix a seat that is too long for you.
Side by side
Steelcase Karman vs Herman Miller Cosm: Karman is able to stop the recline, whereas Cosm keeps the back moving
Quick verdict
Go with Karman if you want automatic resistance plus control over how far the chair reclines. Karman comes with an upright lock, a mid-stop and four-dimensional arms. Go with Cosm Mid-Back if you prefer unrestricted automatic tilt and its fixed seat and height-only arms already fit. Seat depth is not adjustable on either. A shared chair still has to fit both people before the automatic mechanism is of any use.
Before you buy
Why, and what it costs you
A chair that suits calls may act differently at the keyboard
At a shared home desk, one person might lean back on calls while another wants the chair to stop upright for close keyboard work. Karman keeps its automatic resistance and can add an upright or intermediate stopping point. Cosm keeps the movement automatic but has no lock. That makes Karman easier to set up for those two preferences. Cosm is the cleaner choice only if free movement is exactly what both people want.
Where this comes from
This sets verified recline stops against two task preferences. A lock is a movement preference and no evidence of better posture or work performance.
The catch
Herman Miller Cosm Mid-Back
Cosm lacks both a tilt lock and manual tension adjustment. No setting will give you an upright stop.
Steelcase Karman
- Why pick it
- Your day alternates between relaxed calls and desk tasks, where an upright lock or mid-stop helps.
- Changing devices means your arms must shift forward, back or sideways.
- The catch
- Seat depth is fixed at 17.25-inch. Extra arm controls can't fix a seat that is too long for you.
Herman Miller Cosm Mid-Back
- Why pick it
- Continuous automatic movement appeals to you, and a tilt lock does not.
- Having tried the fixed seat and height-only arms, you find they fit your usual desk position.
- The catch
- Cosm lacks both a tilt lock and manual tension adjustment. No setting will give you an upright stop.
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What this page compares
Karman against Cosm Mid-Back for a shared desk, close keyboard work and reclined calls. See which controls still matter once tension is automatic.
Each is a premium chair with a suspended seat and automatic recline resistance. The choice that matters is between automatic movement all the time and the option to restrict it for a particular task.
Which one fits
Pick the situations that sound like you
Want to stop upright for close desk work
Karman has a lock, and Cosm doesn't.
- Steelcase Karman
- Better fit
- Herman Miller Cosm Mid-Back
- Caution
Prefer automatic tilt that runs continuously, no stops
Cosm is designed around that preference, as long as the fixed fit works.
- Steelcase Karman
- Good
- Herman Miller Cosm Mid-Back
- Better fit
With a shallow desk, the arm pads get in the way
Pad retraction and width adjustment come with Karman.
- Steelcase Karman
- Better fit
- Herman Miller Cosm Mid-Back
- Caution
Different seat depths are needed by two users
The seats are fixed on both. Try an alternative with adjustable depth.
- Steelcase Karman
- Caution
- Herman Miller Cosm Mid-Back
- Caution
In practice
Differences you will notice
A chair that suits calls may act differently at the keyboard
At a shared home desk, one person might lean back on calls while another wants the chair to stop upright for close keyboard work. Karman keeps its automatic resistance and can add an upright or intermediate stopping point. Cosm keeps the movement automatic but has no lock. That makes Karman easier to set up for those two preferences. Cosm is the cleaner choice only if free movement is exactly what both people want.
How we worked this out
This sets verified recline stops against two task preferences. A lock is a movement preference and no evidence of better posture or work performance.
An automatic chair can still be a poor choice to share
A couple sharing a desk may differ more in thigh length than in the recline resistance they prefer. Seat depth is fixed on both chairs. If one person can't sit against the back without the front edge crowding the knees, changing tension won't remove that mismatch. Have both users try the actual chair. If only one fits, a depth-adjustable alternative is a more useful change than choosing between these two automatic mechanisms.
How we worked this out
Both fixed-depth seats are set against different users. It assumes no formula from height to thigh length and no universal knee-clearance threshold.
Movable arm pads are worth more with a shallow desk
If the desk is shallow and the monitor is already close to the wall, backing the whole chair up to clear its arm pads also lengthens your reach to the keyboard. Karman lets you retract the pads and change their width and keep arm support. The arms on the selected Cosm change in height only. Lowering them may clear the desk but could leave them below the support position you prefer. Check the underside of the desk and also where the pads need to sit while you type.
How we worked this out
This sets arm movement against limited desk depth. Karman specifies two inches of retraction. Desk clearance and a comfortable elbow position still need to be measured.
Option A
Steelcase, Black Intermix, black frame
Karman
Your day alternates between relaxed calls and desk tasks, where an upright lock or mid-stop helps.
- Best for
- Your day alternates between relaxed calls and desk tasks, where an upright lock or mid-stop helps.
Facts we checked
- End of the recline: Upright lock and mid-stop, plus normal and boost modes
- Arm placement: Height, width, depth and pivot adjustment
- Seat depth: Fixed 17.25 inches
- Tension setup: Weight-responsive modes
Option B
Herman Miller, Graphite, height-adjustable arms
Cosm Mid-Back
Continuous automatic movement appeals to you, and a tilt lock does not.
- Best for
- Continuous automatic movement appeals to you, and a tilt lock does not.
Facts we checked
- End of the recline: Automatic tilt without a tilt lock
- Arm placement: Selected arms adjust in height only
- Seat depth: Fixed depth, with conflicting published numeric values
- Tension setup: Auto-Harmonic tilt
Spec by spec
Where they really differ
| Spec | Steelcase Karman | Herman Miller Cosm Mid-Back | In practice |
|---|---|---|---|
| End of the recline | Upright lock and mid-stop, plus normal and boost modes | Automatic tilt without a tilt lock | A chair used for both calls and close work may need a stopping point you can repeat. |
| Arm placement | Height, width, depth and pivot adjustment | Selected arms adjust in height only | The chair can keep up with a switch from keyboard to tablet and the desk setup stays put. |
| Seat depth | Fixed 17.25 inches | Fixed depth, with conflicting published numeric values | Seat length isn't changed by the automatic mechanism on either. |
| Tension setup | Weight-responsive modes | Auto-Harmonic tilt | Each cuts down the manual tension setup when the sitter changes. |
Trade-offs
What each pick costs you
With Steelcase Karman
- This Amazon package doesn't confirm the optional lumbar pad. If that adjustment matters, check it separately.
With Herman Miller Cosm Mid-Back
- What this covers is the Mid-Back configuration with height-adjustable arms and carpet casters. It isn't a Leaf-arm or High-Back model.
Change of plan
When the answer changes
A user needs the recline to stop upright
Go with Steelcase Karman. Along with an upright lock, Karman keeps its automatic resistance.
Free automatic tilt is wanted, and the fixed fit has already been proven
Go with Herman Miller Cosm Mid-Back. Cosm does away with the tilt-mode choice and doesn't add a control.
Decision guide
Before you buy
The aim is a chair that hands over easily between people and still gives a predictable position when you go from a call to close desk work.
What this page can’t tell you
- There is no measured winner on comfort, pain relief, temperature or durability. Automatic resistance does not extend to seat height or depth.
By the numbers
What the data shows
What we found across the office chairs we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Steelcase Karman |
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| Herman Miller Cosm Mid-Back |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Steelcase Karman
Your day alternates between relaxed calls and desk tasks, where an upright lock or mid-stop helps.
Changing devices means your arms must shift forward, back or sideways.
See price & reviews on AmazonHerman Miller Cosm Mid-Back
Continuous automatic movement appeals to you, and a tilt lock does not.
Having tried the fixed seat and height-only arms, you find they fit your usual desk position.
See price & reviews on AmazonEach link opens in a new tab.
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