足立レイ (Adachi Rei) vs HRP-4
Side-by-side comparison of 足立レイ (Adachi Rei) (Mechanical Girl) and HRP-4 (Kawada Industries) — specs, pricing, Robolist Product Score, and verified deployments. Updated daily.
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Layer 1: Identity & Trust
Manufacturer Country
- 足立レイ (Adachi Rei)Japan
- HRP-4Japan
Year First Available
- 足立レイ (Adachi Rei)2022
- HRP-42010
Verified Deployments
- 足立レイ (Adachi Rei)0 Deployments
- HRP-40 Deployments
Layer 2: Operational
Price Range (USD)
- 足立レイ (Adachi Rei)$1,000
- HRP-4$300,000
Battery / Shift Runtime
- 足立レイ (Adachi Rei)—
- HRP-40.4 hrs
Availability Status
- 足立レイ (Adachi Rei)ACTIVE
- HRP-4ACTIVE
Physical Form Factor
Height
- 足立レイ (Adachi Rei)168 mm
- HRP-4151 mm
Weight
- 足立レイ (Adachi Rei)20 kg
- HRP-439 kg
Mobility Type
- 足立レイ (Adachi Rei)—
- HRP-4bipedal
Humanoid Subtype
- 足立レイ (Adachi Rei)digital avatar
- HRP-4research platform
Walking Speed
- 足立レイ (Adachi Rei)—
- HRP-40.6 m/s
Stair Climbing
- 足立レイ (Adachi Rei)—
- HRP-4No
Terrain
- 足立レイ (Adachi Rei)both
- HRP-4flat indoor
Payload & Dexterity
Payload
- 足立レイ (Adachi Rei)—
- HRP-40.5 kg
Total DOF
- 足立レイ (Adachi Rei)—
- HRP-434
Arm DOF
- 足立レイ (Adachi Rei)—
- HRP-47
Hand DOF
- 足立レイ (Adachi Rei)—
- HRP-42
Bimanual Coordination
- 足立レイ (Adachi Rei)—
- HRP-4Yes
Compute & AI
Onboard Compute
- 足立レイ (Adachi Rei)Intel i7-7567U @ 3.5GHz
- HRP-4Linux kernel with RT-Preempt patch
Compute Platform
- 足立レイ (Adachi Rei)—
- HRP-4Intel Pentium M (1.6 GHz)
VLM Capable
- 足立レイ (Adachi Rei)—
- HRP-4No
Foundation Models
- 足立レイ (Adachi Rei)—
- HRP-4false
Imitation Learning
- 足立レイ (Adachi Rei)—
- HRP-4No
Programming
- 足立レイ (Adachi Rei)code_python, no_code_gui
- HRP-4code_ros
Battery & Power
Runtime
- 足立レイ (Adachi Rei)—
- HRP-40.4 hrs
Battery Swap
- 足立レイ (Adachi Rei)—
- HRP-4No
Safety
Human Detection Method
- 足立レイ (Adachi Rei)—
- HRP-4vision human
Software
SDK Languages
- 足立レイ (Adachi Rei)code_python, no_code_gui
- HRP-4Linux
ROS Support
- 足立レイ (Adachi Rei)—
- HRP-4Yes
Open API
- 足立レイ (Adachi Rei)—
- HRP-4No
Reliability
Deployment Maturity
- 足立レイ (Adachi Rei)commercial
- HRP-4prototype
Commercial
Price (USD)
- 足立レイ (Adachi Rei)$1,000
- HRP-4$300,000
Price Tier
- 足立レイ (Adachi Rei)<10K
- HRP-4150K+
Pricing Model
- 足立レイ (Adachi Rei)outright purchase
- HRP-4purchase
Applications
- 足立レイ (Adachi Rei)teleoperation
- HRP-4research
| | |
|---|---|---|
| Layer 1: Identity & Trust | ||
| Manufacturer Country | Japan | Japan |
| Year First Available (values differ) | 2022 | 2010 |
| Verified Deployments | 0 Deployments | 0 Deployments |
| Layer 2: Operational | ||
| Price Range (USD) (values differ) | $1,000 | $300,000 |
| Battery / Shift Runtime (values differ) | — | 0.4 hrs |
| Availability Status | ACTIVE | ACTIVE |
| Layer 3: Category Specific | ||
| Physical Form Factor | ||
| Height (values differ) | 168 mm | 151 mm |
| Weight (values differ) | 20 kg | 39 kg |
| Mobility Type (values differ) | — | bipedal |
| Humanoid Subtype (values differ) | digital avatar | research platform |
| Walking Speed (values differ) | — | 0.6 m/s |
| Stair Climbing (values differ) | — | No |
| Terrain (values differ) | both | flat indoor |
| Payload & Dexterity | ||
| Payload (values differ) | — | 0.5 kg |
| Total DOF (values differ) | — | 34 |
| Arm DOF (values differ) | — | 7 |
| Hand DOF (values differ) | — | 2 |
| Bimanual Coordination (values differ) | — | Yes |
| Compute & AI | ||
| Onboard Compute (values differ) | Intel i7-7567U @ 3.5GHz | Linux kernel with RT-Preempt patch |
| Compute Platform (values differ) | — | Intel Pentium M (1.6 GHz) |
| VLM Capable (values differ) | — | No |
| Foundation Models (values differ) | — | false |
| Imitation Learning (values differ) | — | No |
| Programming (values differ) | code_python, no_code_gui | code_ros |
| Battery & Power | ||
| Runtime (values differ) | — | 0.4 hrs |
| Battery Swap (values differ) | — | No |
| Safety | ||
| Human Detection Method (values differ) | — | vision human |
| Software | ||
| SDK Languages (values differ) | code_python, no_code_gui | Linux |
| ROS Support (values differ) | — | Yes |
| Open API (values differ) | — | No |
| Reliability | ||
| Deployment Maturity (values differ) | commercial | prototype |
| Commercial | ||
| Price (USD) (values differ) | $1,000 | $300,000 |
| Price Tier (values differ) | <10K | 150K+ |
| Pricing Model (values differ) | outright purchase | purchase |
| Applications (values differ) | teleoperation | research |
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
best in categoryweakest in categoryvalues differ
Trade-offs at a glance
Frequently asked
Who makes 足立レイ (Adachi Rei) and HRP-4?
足立レイ (Adachi Rei) is made by Mechanical Girl, based in JP. HRP-4 is made by Kawada Industries, based in JP.
When were 足立レイ (Adachi Rei) and HRP-4 launched?
足立レイ (Adachi Rei) launched in 2022. HRP-4 launched in 2010.
How much does 足立レイ (Adachi Rei) cost compared to HRP-4?
足立レイ (Adachi Rei) is listed at $1,000. HRP-4 is listed at $300,000.
How do 足立レイ (Adachi Rei) and HRP-4 compare on the Robolist Product Score?
足立レイ (Adachi Rei) scores 56/100. HRP-4 scores 100/100. The Product Score blends specs, pricing transparency, verified deployments, and independent media coverage — see methodology for the full breakdown.
Are 足立レイ (Adachi Rei) and HRP-4 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 足立レイ (Adachi Rei) and HRP-4?
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
About this comparison
足立レイ (Adachi Rei) vs HRP-4 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 Robolist Product Score is calculated.