KI Altus vs SIHOO M18

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

KI Altus

$881 – $1,516

SIHOO

SIHOO M18

$289.99 – $299.99

$591.01

lower starting price for SIHOO M18 than KI Altus at the brand stores

Differences at a glance

KI AltusSIHOO M18

Price: $881 – $1,516$289.99 – $299.99
Seat height: 17–21.75 in (43.2–55.2 cm); 16.25–20.75 in (41.3–52.7 cm)44–54 cm
Seat depth: 17.25–19.75 in (43.8–50.2 cm); 15.5–18 in (39.4–45.7 cm)17.91 in (≈ 45.5 cm)
Load capacity: supports up to 400 pounds330 lb (≈ 150 kg)
Arms: Adjustable arms, fixed arms, or armlessAdjustable armrests (Up and down)
Headrest: Headrest available (Mesh Task / Fabric Task Headrest Adjustable Armchair)Headrest moves 3.9" up and down and pivots 45°
Lumbar support: Mesh chair: optional adjustable lumbar (height and depth); fabric chair: automatic lumbar supportLumbar support adjusts vertically and horizontally
Warranty: Lifetime3 years

Which is cheaper, the KI Altus or the SIHOO M18?

The SIHOO M18 is cheaper to start: $289.99 versus $881 for the KI Altus at the brand stores (Sep 2026).

Which has a headrest?

Both: the KI Altus as standard and the SIHOO M18 as standard.

What do owners mention most?

Back support for the KI Altus, and price and value for the SIHOO M18, based on review summaries.