SIHOO Doro C300 Pro vs Autonomous ErgoChair Pro: Which Should You Buy?

Key difference: The ErgoChair Pro carries a lifetime warranty, but the C300 Pro has 6D armrests where the ErgoChair Pro has 3D.

Figures for the SIHOO Doro C300 Pro come from SIHOO's official pages and those for the Autonomous ErgoChair Pro from Autonomous's; prices are regular US list prices, and Chairpedia has not tested either chair.

Why compare them

Why put the SIHOO Doro C300 Pro next to the Autonomous ErgoChair Pro? The SIHOO Doro C300 Pro and the Autonomous ErgoChair Pro are mesh chairs with a headrest, each sold direct by its brand.

Specs side by side

Strengths and weaknesses

SIHOO Doro C300 Pro

Strengths

• 6D armrests, against 3D armrests on the ErgoChair Pro.
• Automatic lumbar support ("Lumbar support automatically conforms to your spine (BM Tracking System)"), where the ErgoChair Pro's is set by hand.
• Higher maximum load: 330 lb (≈150 kg), against 300 lb (≈136.1 kg) on the ErgoChair Pro.
• A Footrest Version is sold; none is listed for the ErgoChair Pro.

Weaknesses

• Shorter warranty: 3 years, against Lifetime on the ErgoChair Pro.
• Costs more: from $789.99 against $499 for the ErgoChair Pro.
• No manual lumbar setting is listed for the C300 Pro, unlike the ErgoChair Pro.
• No seat-type choice is listed for the C300 Pro, unlike the ErgoChair Pro.

Autonomous ErgoChair Pro

Strengths

• Longer warranty: Lifetime, against 3 years on the C300 Pro.
• Lower list price: from $499 against $789.99 for the C300 Pro.
• Lumbar you set by hand ("Sliding (height-adjustable) lumbar; 6 in lumbar height range"), where the C300 Pro's works on its own.
• Choice of a foam or a mesh seat, which the C300 Pro's store listing does not offer.

Weaknesses

• 3D armrests, against 6D on the C300 Pro.
• Lumbar is set by hand ("Sliding (height-adjustable) lumbar; 6 in lumbar height range"), while the C300 Pro's moves on its own.
• Lower maximum load: 300 lb (≈136.1 kg), against 330 lb (≈150 kg) on the C300 Pro.
• No footrest version is listed for the ErgoChair Pro, unlike the C300 Pro.

How they differ

Warranty. The SIHOO Doro C300 Pro lists “3 years”, the Autonomous ErgoChair Pro “Lifetime”. The ErgoChair Pro's cover runs longer.

Price. At regular US list prices the SIHOO Doro C300 Pro is $789.99–$839.99 and the Autonomous ErgoChair Pro is $499. The ErgoChair Pro lists about $290 below the C300 Pro, before any store sale.

Armrests. The SIHOO Doro C300 Pro lists “6D coordinated armrests (up and down, left and right, front and back, inward and outward, with tilt-lock of armrests, and synchronized recline)”, the Autonomous ErgoChair Pro “3D armrests; armrest height 11–14 in from seat”. With 6D armrests the C300 Pro lets you set the pads in more ways than the ErgoChair Pro.

Lumbar support. The SIHOO Doro C300 Pro lists “Lumbar support automatically conforms to your spine (BM Tracking System)”, the Autonomous ErgoChair Pro “Sliding (height-adjustable) lumbar; 6 in lumbar height range”. The C300 Pro's lumbar moves on its own as you shift, while the ErgoChair Pro's is positioned by hand.

Maximum load. The SIHOO Doro C300 Pro lists “330 lb (≈150 kg)”, the Autonomous ErgoChair Pro “300 lb (≈136.1 kg)”. The C300 Pro is rated for more weight.

Seat options. The ErgoChair Pro is sold with a foam or a mesh seat; the C300 Pro's store listing has no seat-type choice.

Footrest. SIHOO sells a Footrest Version of the C300 Pro; no such version is listed for the ErgoChair Pro.

Seat size. Seat height: the SIHOO Doro C300 Pro lists “18.11–22.32 in (46–56.7 cm)”, the Autonomous ErgoChair Pro “18.5–22 in (≈47–55.9 cm)”. Seat width: the SIHOO Doro C300 Pro lists “20.28 in (≈51.5 cm)”, the Autonomous ErgoChair Pro “19 in (≈48.3 cm)”. Seat depth: the SIHOO Doro C300 Pro lists “16.81–17.76 in (≈42.7–45.1 cm)”, the Autonomous ErgoChair Pro “19–21.5 in (≈48.3–54.6 cm)”.

Other details. Headrest: the SIHOO Doro C300 Pro lists “Headrest adjusts up and down, back and forth, or rotates”, the Autonomous ErgoChair Pro “Adjustable headrest (standard)”. Recline: the SIHOO Doro C300 Pro lists “Up to 135°”, the Autonomous ErgoChair Pro “Synchro-tilt; 22° recline range; 5 lock positions (Donati reclining mechanism)”. Chair weight: the SIHOO Doro C300 Pro lists “55.34 lb (≈25.1 kg)”, the Autonomous ErgoChair Pro “48.5 lb (≈22 kg)”.

Who should buy which

• Pick the C300 Pro over the ErgoChair Pro if you want 6D armrests rather than 3D.
• Pick the C300 Pro over the ErgoChair Pro if you want lumbar support that adjusts itself as you move, with nothing to set.
• Pick the C300 Pro over the ErgoChair Pro if you want a higher weight rating: 330 lb (≈150 kg).
• Pick the ErgoChair Pro over the C300 Pro if you want a longer warranty (Lifetime).
• Pick the ErgoChair Pro over the C300 Pro if you want the lower price — the ErgoChair Pro lists about $290 below the C300 Pro.
• Pick the ErgoChair Pro over the C300 Pro if you want a lumbar position you set yourself and that stays put.

Sources

• SIHOO Doro C300 Pro (compared here with the ErgoChair Pro): Sihoo Doro C300 Pro Ergonomic Office Chair Fully Loaded Comfort – EU Sihoo official Shop; Sihoo Doro C300 Pro Ergonomic Office Chair – Official US Sihoo Store; Doro C300 Pro Ergonomic Office Chair | Adjustable Lumbar, 6D Armrests, Smart Recline – UK Sihoo official Shop, checked 2026-10-08; US list price from SIHOO US Official Store, checked 2026-10-08.
• Autonomous ErgoChair Pro (compared here with the C300 Pro): www.autonomous.ai, checked 2026-09-28; US list price from Autonomous, checked 2026-09-25.
• Figures marked ≈ for the C300 Pro and ErgoChair Pro are Chairpedia's unit conversions, not brand figures.