Vitra ID Soft vs SIHOO M18

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

Vitra

Vitra ID Soft

From $995

SIHOO

SIHOO M18

$289.99 – $299.99

$705.01

lower starting price for SIHOO M18 than Vitra ID Soft at the brand stores

Differences at a glance

Vitra ID SoftSIHOO M18

Price: From $995$289.99 – $299.99
Seat height: 400–520 mm (15¾″–20½″), measured with 64 kg load; 450 mm (17¾″) fixed seat height44–54 cm
Seat depth: 400–450 mm; 380 mm17.91 in (≈ 45.5 cm)
Recline: FlowMotion mechanism, lockable in upright sitting position, optional synchronised forward tilt; or optional AutoMotion mechanism with automatic weight adjustment and two backrest tension settings (hard or soft). No recline angle published.Maximum 126° recline angle
Arms: 2D armrests (height, width) or 3D armrests (height, width, depth, 360° swivel); ring armrests for conference use; also without armrests. Armrest height above seat 195–295 mm (7¾″–11½″)Adjustable armrests (Up and down)
Warranty: 5 years (Vitra Inc. Limited Warranty, sales via the Vitra online shop)3 years

From 4 Vitra ID Soft and 5 SIHOO M18 user reviews, most mentioned first. Green is liked, orange is a caution.

Which is cheaper, the Vitra ID Soft or the SIHOO M18?

The SIHOO M18 is cheaper to start: $289.99 versus $995 for the Vitra ID Soft at the brand stores (Oct 2026).

What do owners mention most?

Price and value for the Vitra ID Soft, and price and value for the SIHOO M18, based on review summaries.