Axonnic, a San Francisco startup in Y Combinator's Fall 2026 batch, has launched a forearm sleeve that records electrical muscle activity as people perform tasks, with the aim of training dexterous robots. The company did not disclose how much funding it has raised.
The sleeve relies on electromyography, or EMG, a technique that picks up the electrical signals muscles produce when they contract. Maxim Williams, Axonnic's chief executive, laid out the thinking in a LinkedIn post announcing the product. "Cameras capture movement, but they miss the muscle activity, effort, and preparation behind it," he wrote. "Axonnic's sleeve captures those signals directly from the human body, creating richer data for training robots."
How the sleeve works
The company's website calls the product "the missing data layer for dexterous robotics." Workers wear the sleeve while doing their jobs on site, and Axonnic then aligns the EMG signals with video and hand-pose data to assemble task datasets. Those datasets are used to train robot policies, the software rules that govern how a machine acts.
The muscle data matters only during training. According to the site, a deployed robot runs on its own sensors.
Axonnic lists sewing, delicate assembly, tool use and construction fieldwork as target tasks. Its site also shows a benchmark demonstration that compares Apple Vision Pro hand tracking against a robotic hand driven by forearm EMG alone; the clip is dated October 24, 2026.
The FAQ makes the pitch plainly. "A robot's sensors tell it what it is doing," it says. "They can't tell it how a skilled human does the task… EMG captures that from the worker, and we use it to teach the robot the parts of the skill a camera can't explain."
Team, backers and pilots
Williams holds an Oxford MBiol degree, and his Y Combinator profile lists him as an author of research on high-density surface EMG. He previously worked on internal tools at Skyscanner and was an early employee at Voxblock.
Arsh Patankar, the chief technology officer, studied at Oxford from 2022 to 2026, according to his YC profile, which also lists earlier affiliations with J.P. Morgan and Mayo Clinic. Aaron Epstein is the company's primary partner at Y Combinator.
The site names Y Combinator, Boost VC, Sterling Road and Oxford Seed Fund as backers but gives no round sizes or terms. Axonnic's LinkedIn page showed two employees and a company-size band of 2 to 10.
