Fauna Sprout: A lightweight, approachable, developer-ready humanoid robot

TL;DR

Sprout is a safe, expressive, and accessible humanoid robot platform designed for deployment in human environments, combining lightweight design, compliant control, and social interaction capabilities to advance practical embodied intelligence.

Contribution

Introduces Sprout, a lightweight, developer-friendly humanoid robot platform emphasizing safety, expressivity, and ease of deployment in human spaces.

Findings

Supports safe operation with compliant control and soft exteriors

Enables social interaction through an expressive head

Facilitates long-term deployment in human environments

Abstract

Recent advances in learned control, large-scale simulation, and generative models have accelerated progress toward general-purpose robotic controllers, yet the field still lacks platforms suitable for safe, expressive, long-term deployment in human environments. Most existing humanoids are either closed industrial systems or academic prototypes that are difficult to deploy and operate around people, limiting progress in robotics. We introduce Sprout, a developer platform designed to address these limitations through an emphasis on safety, expressivity, and developer accessibility. Sprout adopts a lightweight form factor with compliant control, limited joint torques, and soft exteriors to support safe operation in shared human spaces. The platform integrates whole-body control, manipulation with integrated grippers, and virtual-reality-based teleoperation within a unified hardware-software stack. An expressive head further enables social interaction -- a domain that remains underexplored on most utilitarian humanoids. By lowering physical and technical barriers to deployment, Sprout expands access to capable humanoid platforms and provides a practical basis for developing embodied intelligence in real human environments.