Quaddle | The World's Most Versatile Palm-Sized Robot

Bringing advanced mobility, AI, and an open-source platform together in one compact package—for everyone.

Meet the Quaddle Family

Designed to be built and rebuilt via snap-fits.
Just 4 screws. Ready in minutes. Walks for hours.

Walks, does tricks, and codes in Block/Python/C++.

Builder, plus AI conversation and Learn & Replay.

Buddy, plus gesture, light, and infrared sensors.

Legs Reinvented: Mechanical Intelligence

An ingenious mechanism allows a single motor to drive both the shoulder and knee. By replacing extra actuators with smart mechanics, Quaddle cuts costs and extends battery life while delivering agility that rivals—and in some ways surpasses—that of far more complex robots.

🔊 Sound On!

Watch this 2-minute video to experience Quaddle's AI dialogue and real footstep rhythms in action!

World's First 4-Servo Omnidirectional Robot Dog

Trotting, gliding, sideways, and crisp in-place spins—redefining what's possible without piling on joints and actuators.

Built to Take a Hit: 100+ Resilient Motions

Quaddle is an adaptable, research-ready platform built for any real-world challenge.

Goes Further than You'd Imagine

Swap the foot tips to conquer land, water, and gravity.

Before the show robots get into my home, I make Quaddle.

"Quaddle paddles in the water" is for proof of concept only. Quaddle isn't waterproof. Do not try it at home. Different foot tips are not included but can be 3D-printed.

Learn & Replay Your Trick

Physically guide Quaddle through any movement — no code or app needed. Just tap to record and replay. (Available on Buddy and Scout)

Be The First in Line

Stay informed on Quaddle to discover early access and upcoming deals.

Your Desk Just Got a New Resident

Most robots wow you for a day and collect dust by the weekend. Quaddle talks back, reacts to your touch, and keeps surprising you.

Chat with It

Open-domain AI conversation — ask it almost anything (Buddy & Scout).

Touch It

Tap Quaddle, and it reacts with movements and expressions.

Control It

Free mobile app to control Quaddle with built-in skills and customize commands.

Make It Yours

LEGO-compatible body shell — snap on any brick to personalize the look.

It Wants to Play with You

Start by playing with simple tricks, and end up mastering robotics without even realizing it. Next time a robot video plays, talk like a pro.

From One Robot to Many

Transform Quaddle into entirely new robots—from bipeds to Mecanum-wheel rovers—with 3D-printed parts and the OpenCat platform. Prototype, iterate, and explore AI robotics—no big lab required.

Try It Before It Arrives

Coming soon — control and interact with Quaddle in our free web simulator — no installation, works on mobile.

Test gaits and custom moves in the simulator before running them on hardware.

Be The First in Line

Stay informed on Quaddle to discover early access and upcoming deals.

A Tinkerlab Inside a Micro-Robot

We packed a powerhouse of multi-core processors and peripherals into a palm-sized frame for ultimate hacking and tinkering.

Code It Your Way — or Don't Code at All

Drag-and-drop blocks on iPad or Android tablet. Graduate to Python when you're ready. AI helps you along the way.

Built on OpenCat — the open-source quadruped platform cited in 20+ academic papers. Block coding → Python → MicroPython → C++ (Arduino IDE) → ROS. Free curricula included.

Quaddle Scout with Sensing

Quaddle Scout is the most advanced model, capable of sensing light and objects and detecting gestures. Compatible with AI vision module.

A Physical AI Platform You Can Extend

Plug things in. Make it yours.

🔌 Unlimited development over USB
🚶 Up to 2 hours of nonstop walking
🔋 Swappable battery for extended sessions

Arduino/ESP32 module support

Quaddle has a variety of programmable peripherals. Expand its sensing and capabilities with plug-in modules.

Raspberry Pi Zero & ROS-ready

Built-in Pi Zero socket on all models; run computer vision or any Pi project you have in mind (Pi not included).

Be The First in Line

Stay informed on Quaddle to discover early access and upcoming deals.

The Story of Petoi — the Builder of Quaddle

Dr. Rongzhong Li founded Petoi in his dorm lab in 2016. After his prototype robot video went viral, he wanted to ensure the robot could truly work in more users' hands, rather than keep posting fancy demos branded as open-source that only experts could reproduce.

Today, Petoi's OpenCat project has shipped 30k+ Bittle dogs and Nybble cats to 60+ countries and raised $700K+ across prior Kickstarter and Indiegogo campaigns. Dr. Li still handles a quarter of customer support directly.

The Story of Petoi — the Builder of Quaddle

Built on a Platform That's Already Proven

Quaddle runs on OpenCat — GitHub's most starred open-source quadruped robot project since 2018.

30,000+ robots shipped to 60+ countries across Petoi's Bittle and Nybble lineup.
Cited in 20+ academic papers — used in university research labs and K-12 classrooms worldwide.
Market Pioneer: Proven and validated the market for maker-level, servo-driven quadruped robots.