Digit V4 vs Walker S1
Side-by-side comparison of Digit V4 (Agility Robotics, Inc.) and Walker S1 (UBTECH Robotics Corp Ltd.) — specs, pricing, Robo Score, and verified deployments. Updated daily.
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Layer 1: Identity & Trust
Manufacturer Country
- Digit V4United States
- Walker S1China
Year First Available
- Digit V42024
- Walker S12024
Verified Deployments
- Digit V40 Deployments
- Walker S10 Deployments
Layer 2: Operational
Price
- Digit V4$250,000 USD
- Walker S1$75,000 USD
Battery / Shift Runtime
- Digit V48 hrs
- Walker S12 hrs
Availability Status
- Digit V4ACTIVE
- Walker S1ACTIVE
Physical Form Factor
Height
- Digit V4175 mm
- Walker S1130 mm
Weight
- Digit V464 kg
- Walker S176 kg
Mobility Type
- Digit V4bipedal
- Walker S1bipedal
Humanoid Subtype
- Digit V4full bipedal
- Walker S1full bipedal
Walking Speed
- Digit V41.3 m/s
- Walker S10.8 m/s
Running Capable
- Digit V4dynamic walk
- Walker S1—
Stair Climbing
- Digit V4production ready
- Walker S1Yes
Terrain
- Digit V4flat_indoor, mild_incline
- Walker S1flat indoor, uneven outdoor, gravel, tile, thick carpet, lawn
Payload & Dexterity
Payload
- Digit V416 kg
- Walker S110 kg
Total DOF
- Digit V430
- Walker S141
Arm DOF
- Digit V44
- Walker S17
Hand DOF
- Digit V4—
- Walker S16
Arm Reach
- Digit V4—
- Walker S160 cm
Bimanual Coordination
- Digit V4coordinated planning
- Walker S1Yes
Tool Use
- Digit V4production validated
- Walker S1—
Compute & AI
Onboard Compute
- Digit V4NVIDIA Jetson Platform
- Walker S1Intel i7 8665U Frequency 1.9Ghz *2, NVIDIA GT1030 graphics card, 384 cores
Compute Platform
- Digit V4Agility AI
- Walker S1—
VLM Capable
- Digit V4No
- Walker S1No
Foundation Models
- Digit V4—
- Walker S1false
Imitation Learning
- Digit V4No
- Walker S1No
Teleoperation
- Digit V4joystick, web_interface
- Walker S1—
Programming
- Digit V4code_ros, python
- Walker S1ROS 2.0
Battery & Power
Runtime
- Digit V48 hrs
- Walker S12 hrs
Charging Method
- Digit V4auto dock
- Walker S1—
Battery Swap
- Digit V4Yes
- Walker S1No
Safety
Force-Limited Arms
- Digit V4Yes
- Walker S1—
Fall Recovery
- Digit V4Yes
- Walker S1—
Emergency Stops
- Digit V41
- Walker S1—
Human Detection Method
- Digit V4multi modal
- Walker S1—
Safe Speed Near Humans
- Digit V4software_defined
- Walker S1—
Software
SDK Languages
- Digit V4Python, ROS2
- Walker S1Python
ROS Support
- Digit V4none
- Walker S1Yes
Open API
- Digit V4open rest
- Walker S1Yes
Air-Gap Capable
- Digit V4No
- Walker S1—
Reliability
Deployment Maturity
- Digit V4production pilot
- Walker S1commercial
Commercial
Price (USD)
- Digit V4$250,000 USD
- Walker S1$75,000 USD
Price Tier
- Digit V4150K+
- Walker S140-80K
Pricing Model
- Digit V4capex
- Walker S1purchase
Warranty
- Digit V4—
- Walker S12 yrs
Production Pilots
- Digit V4Amazon
- Walker S1—
Applications
- Digit V4warehouse_transport, material handling, e-commerce fulfillment
- Walker S1service, entertainment, education
| | |
|---|---|---|
| Layer 1: Identity & Trust | ||
| Manufacturer Country (values differ) | United States | China |
| Year First Available | 2024 | 2024 |
| Verified Deployments | 0 Deployments | 0 Deployments |
| Layer 2: Operational | ||
| Price (values differ) | $250,000 USD | $75,000 USD |
| Battery / Shift Runtime (values differ) | 8 hrs | 2 hrs |
| Availability Status | ACTIVE | ACTIVE |
| Layer 3: Category Specific | ||
| Physical Form Factor | ||
| Height (values differ) | 175 mm | 130 mm |
| Weight (values differ) | 64 kg | 76 kg |
| Mobility Type | bipedal | bipedal |
| Humanoid Subtype | full bipedal | full bipedal |
| Walking Speed (values differ) | 1.3 m/s | 0.8 m/s |
| Running Capable (values differ) | dynamic walk | — |
| Stair Climbing (values differ) | production ready | Yes |
| Terrain (values differ) | flat_indoor, mild_incline | flat indoor, uneven outdoor, gravel, tile, thick carpet, lawn |
| Payload & Dexterity | ||
| Payload (values differ) | 16 kg | 10 kg |
| Total DOF (values differ) | 30 | 41 |
| Arm DOF (values differ) | 4 | 7 |
| Hand DOF (values differ) | — | 6 |
| Arm Reach (values differ) | — | 60 cm |
| Bimanual Coordination (values differ) | coordinated planning | Yes |
| Tool Use (values differ) | production validated | — |
| Compute & AI | ||
| Onboard Compute (values differ) | NVIDIA Jetson Platform | Intel i7 8665U Frequency 1.9Ghz *2, NVIDIA GT1030 graphics card, 384 cores |
| Compute Platform (values differ) | Agility AI | — |
| VLM Capable | No | No |
| Foundation Models (values differ) | — | false |
| Imitation Learning | No | No |
| Teleoperation (values differ) | joystick, web_interface | — |
| Programming (values differ) | code_ros, python | ROS 2.0 |
| Battery & Power | ||
| Runtime (values differ) | 8 hrs | 2 hrs |
| Charging Method (values differ) | auto dock | — |
| Battery Swap (values differ) | Yes | No |
| Safety | ||
| Force-Limited Arms (values differ) | Yes | — |
| Fall Recovery (values differ) | Yes | — |
| Emergency Stops (values differ) | 1 | — |
| Human Detection Method (values differ) | multi modal | — |
| Safe Speed Near Humans (values differ) | software_defined | — |
| Software | ||
| SDK Languages (values differ) | Python, ROS2 | Python |
| ROS Support (values differ) | none | Yes |
| Open API (values differ) | open rest | Yes |
| Air-Gap Capable (values differ) | No | — |
| Reliability | ||
| Deployment Maturity (values differ) | production pilot | commercial |
| Commercial | ||
| Price (USD) (values differ) | $250,000 USD | $75,000 USD |
| Price Tier (values differ) | 150K+ | 40-80K |
| Pricing Model (values differ) | capex | purchase |
| Warranty (values differ) | — | 2 yrs |
| Production Pilots (values differ) | Amazon | — |
| Applications (values differ) | warehouse_transport, material handling, e-commerce fulfillment | service, entertainment, education |
Insufficient data for full comparison
The following fields had no data for any of the selected robots: Payload (Peak), Grip Strength, Manipulation Repeatability, Battery Capacity, Charging Time, Avg Power Consumption, Fall Detection Response, Simulation Platforms, MTBF, Task Success Rate, IP Rating, Noise Level, RaaS / Month, Developer Unit Price, Delivery Lead Time
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 | Digit V4 | Walker S1 |
|---|---|---|
| Investment | $250,000 | $75,000 |
| Payback period | 60.0 mo | 18.0 mo |
| Net savings (5 yr) | $0 | $175,000 |
| ROI (5 yr) | +0% | +233% |
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 Digit V4 and Walker S1?
Digit V4 is made by Agility Robotics, Inc., based in US. Walker S1 is made by UBTECH Robotics Corp Ltd., based in CN.
When were Digit V4 and Walker S1 launched?
Digit V4 launched in 2024. Walker S1 launched in 2024.
How much does Digit V4 cost compared to Walker S1?
Digit V4 is listed at $250,000. Walker S1 is listed at $75,000.
How do Digit V4 and Walker S1 compare on the Robo Score?
Digit V4 scores 59.4 on the Robo Score. Walker S1 scores 69.6. The Robo Score is a 0–100 credibility figure blending commercial maturity, verified deployments, company standing, and independent coverage — see methodology for the full breakdown.
What is the payload difference between Digit V4 and Walker S1?
Digit V4 carries up to 16 kg. Walker S1 carries up to 10 kg.
Are Digit V4 and Walker S1 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 Digit V4 and Walker S1?
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
Digit V4 vs Walker S1 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 Score is calculated.