Nudge is a US-based neurotechnology startup developing non-invasive, ultrasound-based brain-computer interfaces for everyday use. Founded in 2024 by Fred Ehrsam, co-founder of Coinbase and partner at crypto venture firm Paradigm, the company unveiled its first product, Nudge Zero, in April 2025.

The Nudge Zero is a wearable headset that uses focused ultrasound to modulate brain activity non-invasively. The device is designed to resemble modern audio headsets, emphasizing mainstream aesthetic appeal and wearability. The ultrasound-based approach differs from both invasive electrode implants and traditional non-invasive modalities like EEG and tDCS, offering the potential for deeper brain penetration and more spatially targeted neuromodulation without surgery.

Nudge's stated mission is to develop the best technology for interfacing with the brain to improve people's lives, starting with approaches that can help the most people the fastest. The company targets whole-brain interfaces for everyday life, positioning itself in the growing consumer neurotech segment alongside clinical applications. Nudge is part of a broader wave of ultrasound BCI ventures that view focused ultrasound as a next-generation modality for safe, scalable neural interfaces.