K-Scale Labs · research humanoid
Stompy
K-Scale Labs' first open-source humanoid, described as a 4-foot robot with a claw gripper whose parts each fit on a home 3D printer bed. The company later moved to K-Bot and is listed by Y Combinator as inactive.
- Price
- —never sold at a set price; maker gave a parts cost under $10,000
- Height
- 122 cmTaller than 16%
- Weight
- —Not published
- Payload
- —Not published
- Speed
- —Not published
- Battery
- —Not published
Not sure this is the one? Find the best robot for your job Starts with: research and teaching. Five more quick questions.
Why it matters
A discontinued humanoid from K-Scale Labs.
Real-world use
No customers or deployments reported yet.
Timeline
- Released
- Not yet
Maker
K-Scale LabsCompany · founded 2024 · San Francisco, United StatesAbout US$500K from Y Combinator, a US$4 million seed led by Fellows Fund, plus angel and strategic money (PEdaily); about US$400K left at closure
How it stacks up
Against other humanoids that publish the figure. Pick a measure.
Stompy is taller than 16% of the 305 other humanoids that publish a height. Bars show the 7 closest in date.
Not published by the maker: weight, speed, payload, joints, battery, price.
Public attention
A historic robot: no longer sold or in use, so it is not ranked against current humanoids.
- No Wikipedia article of its own yet
- 1 news story from reputable press listed on this page
Measures how much people read and write about a robot, not how good it is. Measured 2026-10-13; same method for every robot. How it is measured
What’s inside
The parts the company has talked about publicly.
- Movement
- Walks on legs
- Actuators & motors
- Low-inertia, back-drivable quasi-direct-drive actuators with 6:1 to 8:1 reductions and 3-12 Nm nominal torque (count not given).
- Hands
- Claw gripper based on the Universal Manipulation Interface (UMI) research design.
- Battery & power
- Hot-swappable 48 V, 15 Ah pack, good for over an hour.
- Materials & build
- 3D-printed carbon-fibre PAHT parts sized to fit a 256 x 256 mm printer bed; any reasonably strong plastic could be substituted.
- AI & software
- Open-source design; policies trained in simulators such as NVIDIA Isaac and transferred to the robot; K-Scale planned its own vision-language model for perception.
- Other details
- About 4 ft (122 cm) tall; maker gave a bill of materials under US$10,000; built through five hardware iterations in about three months. K-Scale closed in late 2025 and open-sourced its remaining designs.
Named suppliers:NVIDIA
Lineage
Every K-Scale Labs humanoid in order.
Watch Stompy
Made, sold and where
Unit counts are usually company figures; analysts often disagree.
- Price
- Not publishednever sold at a set price; maker gave a parts cost under $10,000
- How to get one
- No official buying page found
- Sold or delivered
- not sold at a set price; design released as open source
- Where it is sold or used
- San Francisco, United States (K-Scale Labs)
News
The latest 1, newest first. Summaries are ours; tap through for the original.
- K-Scale Labs shuts down and open-sources its designs
PEdaily reported K-Scale closed after its pivot to the larger K-Bot strained funds, releasing all hardware designs and tools as open source.
PEdaily
Side by side with its peers
Picked by the same rules for every humanoid: another maker’s robot that moves the same way, is at the same stage and does at least one of the same main jobs, first shown within two years. Closer size and price rank higher. Few robots match closely, so these are the nearest matches. How we choose
| Measure | StompyK-Scale Labs |  RAISE A1 (Yuanzheng / Expedition A1)AgiBot (Zhiyuan Robotics)Same job: research · Both walk · Both past robots |
|---|---|---|
| First shown | 2024 | 2023-08-18 |
| Status | Discontinued | Retired |
| Height | 122 cm | 175 cm |
| Weight | — | 53 kg |
| Joints | — | 49 |
| Speed | — | 7 km/h |
| Payload | — | — |
| Battery | — | — |
| Price | — | — |
Sources
Figures come from the maker. Every link below backs something on this page.
Photos and logos only identify each robot and its maker. Simbeing is not affiliated with, sponsored by or endorsing any company, and nothing here is advertising. Figures are for statistics only and are not advice of any kind. Terms of use