Quaddle — the Cutest Walking AI Robot on Your Desk

Quaddle is a palm-sized walking robot with 90–100+ built-in moves, real conversation, and a personality all its own. Program it in block coding, Python, Arduino, or ROS. Teach it custom moves — no code needed. Built for makers, educators, and curious minds.

More Moves than You'd Expect for a Tiny Robot

Most walking robots rely on 8–12 degrees of freedom to move well. Quaddle does it with 4 servos — and goes sideways, spins in place, and surprises you every time.

World's first 4-servo omnidirectional walking quadruped. Fast walking and gliding, efficient sideways locomotion and rapid in-place spin — capabilities rarely seen in robots with such a simple structure.

Goes Further than You'd Imagine

Swap the foot tips, and it paddles in water or scrambles across the ceiling. Climb steps.

One robot, more tricks than the box suggests.

"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.

90–100+ Built-in Movements, ready to amaze

Only four joints — one per leg — but with more moves than you'd expect. Something that actually feels alive.

It Wants to Play with You

Learn & Replay Your Trick

Physically guide Quaddle through any movement — no code, no app. It records and replays on command. (available on Buddy and Scout)

Be The First in Line

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

Meet the Quaddle Family

Walks, does tricks & codes in Block/Python/C++

Builder plus AI conversation & Learn & Replay

Buddy plus gesture, light & infrared sensors

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

Be The First in Line

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

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.

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.

From Desk Toy to Research Platform

Start by teaching it tricks. End up doing robotics research. Quaddle grows with you.

Prototype and test walking gaits within hours — swap 3D-printed parts, iterate fast. Conduct research in AI robotics, autonomous navigation, and reinforcement learning — no big lab required

A Physical AI Platform You Can Extend

Plug things in. Make it yours.

Arduino/ESP32 module support

expand what Quaddle can sense and do with hardware 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)

Quaddle Scout with Sensing

Quaddle Scout is the most advanced Quaddle, capable of sensing light and objects and detecting gestures.

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.

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
Open-source since 2016 — published on GitHub, actively maintained
Market Pioneer: Proven and validated the market for maker-level, servo-driven quadruped robots.