Steelcase Series 1 vs Humanscale Diffrient Smart

Side by side from official specifications, sourced prices and User Insights. No written comparison exists for this pair yet.

Steelcase

Steelcase Series 1

$549 – $750

Humanscale

Humanscale Diffrient Smart

$1,987

$1,438

lower starting price for Steelcase Series 1 than Humanscale Diffrient Smart at the brand stores

Differences at a glance

Steelcase Series 1Humanscale Diffrient Smart

Price: $549 – $750$1,987
Seat height: 16.5–21.5 in (41.9-54.6 cm); 14.75–17.75 in (37.5-45.1 cm); 17.25–22 in (43.8-55.9 cm)16.5” – 22.8”
Seat depth: 15.5"D to 17.75"D (functional seat depth)16.25” - 18.75” seat depth adjustment range
Load capacity: 400 lb (181.4 kg); 300 lb (136.1 kg)up to 400 lbs.
Recline: Weight-activated synchro tilt; comfort dial with upright back lock, boost setting and weight-activated full recline18° recline + 8° backrest tilt
Arms: 4D arms (standard), height-adjustable arms or armlessFixed Duron Arms / Adjustable Duron Arms / 4D Adj Duron Arms / Armless
Lumbar support: Adjustable lumbar is standard; fixed lumbar is available (3D Microknit Back only)Tri-panel Form-Sensing mesh adapts its lumbar support to each user (no manual lumbar adjustment)
Warranty: Limited Lifetime Warranty; 12-year, multi-shift, 24/7 parts and labor15-year, 24/7 warranty

From 5 Steelcase Series 1 and 2 Humanscale Diffrient Smart user reviews, most mentioned first. Green is liked, orange is a caution.

Adjustability
Steelcase Series 18 mentions
Humanscale Diffrient Smart3 mentions
Price and value
Steelcase Series 18 mentions
Humanscale Diffrient Smart2 mentions
Armrests
Steelcase Series 16 mentions
Humanscale Diffrient Smart1 mention
Seat
Steelcase Series 14 mentions
Humanscale Diffrient Smart2 mentions
Design
Steelcase Series 13 mentions
Humanscale Diffrient Smart3 mentions
Assembly
Steelcase Series 14 mentions
Humanscale Diffrient Smart0 mentions

Which is cheaper, the Steelcase Series 1 or the Humanscale Diffrient Smart?

The Steelcase Series 1 is cheaper to start: $549 versus $1,987 for the Humanscale Diffrient Smart at the brand stores (Sep 2026).

What do owners mention most?

Adjustability for the Steelcase Series 1, and comfort for the Humanscale Diffrient Smart, based on review summaries.