An Open Source Mobile Manipulation Robot Built for People, Not Spectacle
Hello Robot’s Stretch 4 robot arrives as a deliberately pragmatic take on the mobile manipulation robot category. Instead of chasing humanoid theatrics, the company focuses on a compact, lightweight form factor designed to operate safely shoulder-to-shoulder with people in homes and other human-centered spaces. Priced at USD 29,950 (approx. RM140,000), Stretch 4 is positioned as an open source robotics platform for researchers, developers and application engineers building Physical AI systems that have to earn their place in everyday life. Its design is grounded in practical use cases such as supporting people with severe mobility impairments, where reliability, safety and intuitive interaction matter more than impressive lab demos. That people-first brief shapes everything from the hardware architecture to the software stack, making Stretch 4 less a gadget and more a foundation for serious robot platform development.
Sensor-Rich Design and Hardware Built for Real-World Manipulation
Stretch 4’s hardware package reflects a “sensor-rich” philosophy similar to that used in autonomous driving, emphasizing redundancy and coverage over minimalism. The mobile base is omnidirectional with large 20 cm wheels, enabling smooth motion in any direction across carpets, rugs and thresholds. Around the base, six laser line sensors detect small hazards such as cords, rugs and drop-offs, helping the mobile manipulation robot navigate cluttered indoor spaces. The telescoping arm, lift and base operate at twice the speed of the previous Stretch generation, with about 10% more reach and eight redundant degrees of freedom plus a gripper. An ambidextrous wrist with an integrated depth camera can be configured for left- or right-handed operation, while a quick-release mechanism lets users swap between a compliant gripper, parallel jaw gripper and tablet interface, aligning the hardware with diverse research and automation tasks.
Open Source Architecture as a Catalyst for Robot Platform Development
Where Stretch 4 most clearly advances open source robotics is in its platform philosophy. Hello Robot exposes both hardware and software as a modifiable base rather than a locked-down product. Developers gain a fully calibrated sensing head rigidly tied to the arm and base, combining dual hemispherical 3D LiDAR units, global-shutter fisheye RGB cameras, and a central high-resolution RGB camera focused on the gripper’s workspace. Onboard, an NVIDIA Jetson Orin NX enables Physical AI models to run directly on the robot, while an all-new power system delivers up to eight hours of runtime and supports autonomous self-charging via a docking station. This combination of compute, sensing and power in an open platform encourages experimentation: from custom motion planners and perception pipelines to novel end-effector designs, Stretch 4 is engineered as a flexible testbed for robot platform development rather than a single-purpose appliance.
Democratizing Advanced Robotics Beyond Enterprise-Only Solutions
By packaging advanced sensing, manipulation and autonomy in an open source mobile manipulation robot, Hello Robot is helping to democratize capabilities that were once locked inside bespoke industrial systems. Since the first Stretch launched in 2020, more than a thousand users across dozens of institutions have explored mobile manipulation with the platform, demonstrating that high-impact robotics research no longer requires proprietary hardware or massive custom builds. Stretch 4 deepens that accessibility with a more capable, easier-to-use design informed by years of customer feedback. Instead of targeting only large enterprises, the platform welcomes academic labs, startups, assistive technology groups and even advanced hobbyists who want to adapt and extend the system. This community-driven trajectory supports a broader ecosystem where ideas can move rapidly from a simulation or paper into a real robot interacting safely with people in everyday environments.
From Assistive Use Cases to a Community of Physical AI Developers
Stretch 4’s impact is clearest in human-centered applications such as assistive robotics. Hello Robot has piloted deployments with individuals who have severe mobility impairments, enabling tasks like fetching drinks, closing blinds and even feeding via a mobile phone interface. Users describe the robot as an extension of their body, underscoring how mobile manipulation can translate open source robotics research into tangible independence. Leading research groups, including those focused on smart homes and human-centered AI, are using Stretch to explore everyday collaboration between humans and robots. Their work feeds back into the platform, informing new features and software capabilities that benefit the wider community. As more developers share open code, hardware mods and reproducible experiments, Stretch 4 stands to become a reference platform for Physical AI—bridging the gap between cutting-edge algorithms and real-world robots that improve daily life.