Try the gait analyser
Choose a walking video on your device and get a 3D skeleton with measurable gait parameters. The video is analysed in your browser and never uploaded.
CREATE A FREE ACCOUNTResearch project · STRIDE LAB
What if a device could walk with you?
A new approach to walking assistance. Built for people who refuse to give up on mobility.
SIMULATED
ACT 1 · THE PROBLEM
For millions of people, every step is a challenge.
Neurological, neuromuscular and musculoskeletal conditions such as ALS take away strength, balance and rhythm, one step at a time. Each fall risks the independence that walking gives.
Illustration · generated, not a real person
This walk is generated by our software to show a typical one-sided (hemiparetic) gait: a shorter step on one side, the leg swung outwards, the trunk leaning to compensate.
In our Gait Analysis Lab, a real walking video goes through the same transformation: an AI model finds 33 body landmarks in every frame and rebuilds them as a 3D skeleton, so every step can be measured. It all happens inside the browser.
ACT 2 · THE POSSIBILITY
Now imagine the same walk, with a device that walks alongside.
SIMULATED
Pelvic sway
–→–
centimetres, side to side (RMS)
SIMULATED
Trunk lateral range
–→–
degrees of sideways lean
SIMULATED
Step-time asymmetry
–→–
percent difference between the two steps
Hypothetical simulation, not an experimentally validated prediction. The numbers are computed from the generated walk above with the balance-support model of our Gait Analysis Lab. Building a prototype and testing it with real people is exactly the next step.
ACT 3 · THE ENGINEERING
Meet the digital twin.
The device is a belt worn at the waist with four articulated legs on motorised wheels and two telescopic stabilizers. It walks with the wearer, helps keep their balance, steps over kerbs and small stairs, and turns into a seat when they need to rest.
- Four articulated legs that follow the wearer's steps
- Motorised wheels that carry part of the effort
- Balance control that answers sway before it becomes a fall
- Terrain and obstacles: slopes, kerbs and small stairs
- Seat mode: a chair that rolls, wherever you are
- It learns: every browser running it shares what it learns
Its digital twin is a full physics simulation that runs in your browser. It is where the device's control software is developed and learns to walk, long before the first prototype is built.
OPERATE THE DIGITAL TWIN
SIMULATED
Walking: the four legs follow the wearer's steps and the wheels carry part of the effort. Drag to turn it around.
Keeping balance and sorting obstacles
For the person wearing it, this is about staying upright and still getting where they want to go. A 10 cm object in the way: the device stops, lowers the stabilizer on that end and lifts one wheel at a time onto it, the wearer steps up and walks on, and it does the same on the way down. A push or a stumble: it plants both stabilizers and brings the wearer's lean back to upright by itself, even after 90 N·s from five directions, the strongest push in the simulator's Balance tab. Both are recordings from the simulator, the same code that runs when you open it, with its own vectors drawn in: results of a model, not yet of a device worn by a person.
SIMULATED
Loading the recording… Drag to turn it around.
- Lean
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- Margin
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- Front stabilizer
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- Rear stabilizer
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- Push (90 N·s), and a wheel being lifted
- Centre of mass and its velocity
- Device assist (correction)
- Support area: wheels on the ground and planted stabilizers
Recorded with scripts/story-scenes.js from the simulator's balance model (an inverted pendulum with the device's assist and the wearer's own ankle strategy) and its terrain model. A model, not a measurement: the margin is the distance from the centre of mass's ground point to the edge of the support area.
Can you help STRIDE LAB learn to walk?
Open the simulator and leave the tab running. Your browser trains the device's control software on new terrain and obstacles, and regularly shares what it learned with every other browser: only anonymous counts of which moves worked, never anything about you.
What visitors' browsers have done so far
MEASURED- Simulated hours
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- Browser sessions
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- Distinct browsers
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- Terrain scenarios explored
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- Controller experiments
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- Milestones reached
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See the leaderboard, this month's simulator challenge and your invite link
Already working in the simulator SIMULATED
Counted by the server. A browser is a random id kept in one browser, not a person. A terrain scenario is one terrain layout driven in one browser: each new layout counts once. An experiment is one attempt by the simulated controller to get past an obstacle, not validated progress. Milestones are round numbers of these counts, plus each of the things above that the simulator already does.
WHY I AM BUILDING THIS
I live with ALS. I know what it means when walking stops being automatic and every step has to be thought through.
So I am building the device I wish existed: for me, and for everyone whose walking and balance are slipping away.
Reinaldo R. Yañez Arrey · redmouse.ai
ACT 4 · JOIN THE MISSION
Three ways to make it real.
Lend your computer
Run the simulator and leave it open: your browser helps the digital twin learn to walk, and shares what it learns with everyone else's.
MEASURED
RUN THE SIMULATORFund the development
We are in the design stage. Turning it into a device people can wear takes resources: any donation, however small, brings it closer.
DONATE See the roadmap and the next milestoneWays to donate
How we will use the funds: the project is in its first stage, design. In this stage the device's digital twin is fine-tuned and learns to follow the wearer's movements, compensate for instability, improve their balance, and avoid or step over obstacles.
PayPal or card
From any country, with a PayPal account or a credit or debit card.
Bank transfer in euros (SEPA)
From a bank in Europe, usually free of charge. Scan the code with your banking app, or copy the details.
Cryptocurrencies
Donate Bitcoin
Network: Bitcoin (BTC) — on-chain only
Donate USDT
⚠️ Sending through any other network may result in permanent loss of funds.
Your privacy
Walking videos are analysed in your browser and are never uploaded. The motion data the lab keeps is stored encrypted. This research site is not approved for protected health information: use test, volunteer or de-identified recordings.
How STRIDE LAB handles data · Roadmap: what exists, what is simulated, what comes next