HRP-4 vs Walker S2
Side-by-side comparison of HRP-4 (Kawada Industries) and Walker S2 (UBTECH Robotics Corp Ltd.) — specs, pricing, Robo Index, and verified deployments. Updated daily.
Optimize comparison for buyer
Optimized for Warehousing & Logistics buyers. Priority specs lifted to the top and marked with a target.
Layer 1: Identity & Trust
Manufacturer Country
- HRP-4Japan
- Walker S2China
Year First Available
- HRP-42010
- Walker S22025
Verified Deployments
- HRP-40 Deployments
- Walker S20 Deployments
Layer 2: Operational
Price
- HRP-4$300,000–$305,000 USD
- Walker S2$99,995–$314,286 USD
Battery / Shift Runtime
- HRP-40.4 hrs
- Walker S22 hrs
Availability Status
- HRP-4ACTIVE
- Walker S2ACTIVE
Physical Form Factor
Height
- HRP-4151 mm
- Walker S2176 mm
Weight
- HRP-439 kg
- Walker S295 kg
Mobility Type
- HRP-4bipedal
- Walker S2bipedal
Humanoid Subtype
- HRP-4research platform
- Walker S2full bipedal
Walking Speed
- HRP-40.6 m/s
- Walker S22 m/s
Stair Climbing
- HRP-4No
- Walker S2Yes
Terrain
- HRP-4flat indoor
- Walker S2flat indoor, stairs
Payload & Dexterity
Payload
- HRP-40.5 kg
- Walker S252 kg
Total DOF
- HRP-434
- Walker S252
Arm DOF
- HRP-47
- Walker S27
Hand DOF
- HRP-42
- Walker S27
Bimanual Coordination
- HRP-4Yes
- Walker S2Yes
Compute & AI
Onboard Compute
- HRP-4Linux kernel with RT-Preempt patch
- Walker S2X86 + NVIDIA Jetson Orin
Compute Platform
- HRP-4Intel Pentium M (1.6 GHz)
- Walker S2—
VLM Capable
- HRP-4No
- Walker S2No
Foundation Models
- HRP-4false
- Walker S2false
Imitation Learning
- HRP-4No
- Walker S2No
Programming
- HRP-4code_ros
- Walker S2code_ros
Battery & Power
Runtime
- HRP-40.4 hrs
- Walker S22 hrs
Battery Swap
- HRP-4No
- Walker S2Yes
Safety
Human Detection Method
- HRP-4vision human
- Walker S2—
Software
SDK Languages
- HRP-4Linux
- Walker S2Python
ROS Support
- HRP-4Yes
- Walker S2Yes
Open API
- HRP-4No
- Walker S2Yes
Reliability
Deployment Maturity
- HRP-4prototype
- Walker S2commercial
Commercial
Price (USD)
- HRP-4$300,000–$305,000 USD
- Walker S2$99,995–$314,286 USD
Price Tier
- HRP-4150K+
- Walker S280-150K
Pricing Model
- HRP-4purchase
- Walker S2purchase
Applications
- HRP-4research
- Walker S2industrial automation, 24/7 manufacturing
| | |
|---|---|---|
| Layer 1: Identity & Trust | ||
| Manufacturer Country (values differ) | Japan | China |
| Year First Available (values differ) | 2010 | 2025 |
| Verified Deployments | 0 Deployments | 0 Deployments |
| Layer 2: Operational | ||
| Price (values differ) | $300,000–$305,000 USD | $99,995–$314,286 USD |
| Battery / Shift Runtime (priority for Warehousing & Logistics buyers) (values differ) | 0.4 hrs | 2 hrs |
| Availability Status | ACTIVE | ACTIVE |
| Layer 3: Category Specific | ||
| Physical Form Factor | ||
| Height (values differ) | 151 mm | 176 mm |
| Weight (values differ) | 39 kg | 95 kg |
| Mobility Type | bipedal | bipedal |
| Humanoid Subtype (values differ) | research platform | full bipedal |
| Walking Speed (values differ) | 0.6 m/s | 2 m/s |
| Stair Climbing (values differ) | No | Yes |
| Terrain (values differ) | flat indoor | flat indoor, stairs |
| Payload & Dexterity | ||
| Payload (values differ) | 0.5 kg | 52 kg |
| Total DOF (values differ) | 34 | 52 |
| Arm DOF | 7 | 7 |
| Hand DOF (values differ) | 2 | 7 |
| Bimanual Coordination | Yes | Yes |
| Compute & AI | ||
| Onboard Compute (values differ) | Linux kernel with RT-Preempt patch | X86 + NVIDIA Jetson Orin |
| Compute Platform (values differ) | Intel Pentium M (1.6 GHz) | — |
| VLM Capable | No | No |
| Foundation Models | false | false |
| Imitation Learning | No | No |
| Programming (values differ) | code_ros | code_ros |
| Battery & Power | ||
| Runtime (values differ) | 0.4 hrs | 2 hrs |
| Battery Swap (values differ) | No | Yes |
| Safety | ||
| Human Detection Method (values differ) | vision human | — |
| Software | ||
| SDK Languages (values differ) | Linux | Python |
| ROS Support | Yes | Yes |
| Open API (values differ) | No | Yes |
| Reliability | ||
| Deployment Maturity (values differ) | prototype | commercial |
| Commercial | ||
| Price (USD) (values differ) | $300,000–$305,000 USD | $99,995–$314,286 USD |
| Price Tier (values differ) | 150K+ | 80-150K |
| Pricing Model | purchase | purchase |
| Applications (values differ) | research | industrial automation, 24/7 manufacturing |
Insufficient data for full comparison
The following fields had no data for any of the selected robots: Running Capable, Payload (Peak), Arm Reach, Grip Strength, Manipulation Repeatability, Tool Use, Teleoperation, Battery Capacity, Charging Time, Charging Method, Avg Power Consumption, Force-Limited Arms, Fall Recovery, Fall Detection Response, Emergency Stops, Safe Speed Near Humans, Simulation Platforms, Air-Gap Capable, MTBF, Task Success Rate, IP Rating, Noise Level, RaaS / Month, Developer Unit Price, Delivery Lead Time, Warranty, Production Pilots
ROI Comparison
Same operating assumptions across every robot — the only difference is price. Set your numbers once to see which pays back fastest.
Annual labor displaced (per robot): $50,000
| Metric | HRP-4 | Walker S2 |
|---|---|---|
| Investment | $302,500 | $207,140 |
| Payback period | 72.6 mo | 49.7 mo |
| Net savings (5 yr) | -$52,500 | $42,860 |
| ROI (5 yr) | -17% | +21% |
Estimates labor-cost displacement only — not a full total cost of ownership. Actual ROI depends on integration, maintenance, training, downtime, and task fit. Converted currencies are indicative; USD is the price of record.
Trade-offs at a glance
Frequently asked
Who makes HRP-4 and Walker S2?
HRP-4 is made by Kawada Industries, based in JP. Walker S2 is made by UBTECH Robotics Corp Ltd., based in CN.
When were HRP-4 and Walker S2 launched?
HRP-4 launched in 2010. Walker S2 launched in 2025.
How do HRP-4 and Walker S2 compare on the Robo Index?
HRP-4 grades AA on the Robo Index. Walker S2 grades AA. The Robo Index is a credibility grade (AAA … C) that blends commercial maturity, verified deployments, company standing, and independent coverage — see methodology for the full breakdown.
What is the payload difference between HRP-4 and Walker S2?
HRP-4 carries up to 0.5 kg. Walker S2 carries up to 15 kg.
Are HRP-4 and Walker S2 in the same category?
Both robots are classified as Humanoid on Robolist. Filters and ranking treat them as direct alternatives.
What is the realistic total cost of ownership for Humanoid robots?
Hardware cost is one input. Humanoid TCO also includes integration, training, downtime, and end-of-life. Our breakdown: Humanoid TCO: Hardware, Cloud Subscriptions, and the Cost of Teleop Time.
What should a buyer ask vendors when choosing between HRP-4 and Walker S2?
Spec sheets only show part of the story. Useful vendor questions cover support, lifecycle, integration cost, and references. We have a buyer-focused checklist: Vendor Selection for Humanoids: The 10 Questions You Must Ask.
Going deeper — picking the right robot
Humanoid TCO: Hardware, Cloud Subscriptions, and the Cost of Teleop Time
8 min readHumanoid Robots
Vendor Selection for Humanoids: The 10 Questions You Must Ask
10 min readHumanoid Robots
Running a Humanoid Pilot: Scope, Success Criteria, and Exit Options
9 min readHumanoid Robots
Build vs buy vs lease: which model fits a first deployment
8 min readChoosing Your First Robot
The hidden specs vendors hope you'll miss
10 min readReading the Spec Sheet
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About this comparison
HRP-4 vs Walker S2 compares two robots in the humanoid category. All data is sourced from manufacturer spec sheets, verified deployments, and third-party filings; see our methodology for how the Robo Index is calculated.