Itoki ACT2 vs SIHOO Doro S100
Side by side from official specifications, sourced prices and User Insights. No written comparison exists for this pair yet.
16.3 lb
lighter: Itoki ACT2 weighs less than SIHOO Doro S100 (official specs)
Differences at a glance
Sources
- ITOKI Product Catalog: Act2 KJ-457JE-GNB4 ↗Checked Sep 29, 2026
- Doro S100 Ergonomic Chair | Dual Lumbar Support & 4D Armrests – UK Sihoo official Shop ↗Checked Oct 8, 2026
- ITOKI Product Catalog: Act2 functions and features ↗Checked Sep 29, 2026
- Sihoo Doro S100 Ergonomic Office Chair with Dual Dynamic Lumbar Support – Official US Sihoo Store ↗Checked Oct 8, 2026
- ITOKI quality warranty ↗Checked Sep 29, 2026
- ITOKI (Japan) (price) ↗Checked Sep 25, 2026
Itoki ACT2SIHOO Doro S100
- Price
- ¥132,240$499.99 – $509.99
- Seat height
- 450–565 mm (17.7-22.2 in)46–54 cm
- Recline
- 20°Reclines up to 135°
- Arms
- Adjustable arms (4D link arms): height, depth, rotation angle4D coordinated armrests (Up and down, left, right, forward and backward, tilt linkage); Up and down 2.76 in, forward and back 1.18 in, side to side, rotate 72°
- Headrest
- Adjustable head support: 60 mm height, 30° front-backIntegrated headrest adjusts up or down; upper backrest in five levels
- Lumbar support
- Pelvis & lumbar support: 60 mm, 7 stepsDual dynamic lumbar support
- Warranty
- Structure 3 years (mechanisms and moving parts 2 years, exterior and surface finish 1 year)3 years
Questions
Which has a headrest?
Both: the Itoki ACT2 as standard and the SIHOO Doro S100 as standard.
Swap in a similar chair
Compare Itoki ACT2 with
Compare SIHOO Doro S100 with
More comparisons
- Itoki ACT2 vs Herman Miller Aeron The Itoki ACT2 encourages active sitting, while the Herman Miller Aeron offers iconic mesh ventilation.
- Itoki ACT2 vs Steelcase Gesture The Japanese ACT2 and American Gesture differ sharply on durability reports and value.
- SIHOO Doro S100 vs HBADA E3 Pro (2026 Edition) Arms: 4D coordinated armrests on SIHOO Doro S100; Armrest Height: 28.3"–34.4" on HBADA E3 Pro (2026 Edition).
- SIHOO Doro S100 vs SIHOO M18 Arms: 4D coordinated armrests on SIHOO Doro S100; Adjustable armrests on SIHOO M18.
- SIHOO Doro S100 vs SIHOO Doro C300 Pro V2 Arms: 4D coordinated armrests on SIHOO Doro S100; 8D Bionic Armrests on SIHOO Doro C300 Pro V2.
- SIHOO Doro S100 vs SIHOO Doro C300 Pro Arms: 4D coordinated armrests on SIHOO Doro S100; 6D coordinated armrests on SIHOO Doro C300 Pro.




