From Petoi · 30,000+ robots shipped - FUNDED SUCCESSFULLY on Kickstarter
Quaddle | The Open-Source, Do-It-All Desk Robot Dog
Quaddle is the world's first 4-servo omnidirectional quadruped robotics kit for makers, hackers, geeks & STEAM/Robotics/Physical AI educators.
✅ Learn robotics, coding, AI, and 3D printing - grow from beginner to expert, no lab required.
✅ Personalize its expressions, interactions, looks, and even its AI chatbot's persona to make it truly yours.
🔒 Free to join. Early access to our Kickstarter launch. Unsubscribe anytime.
⭐ GitHub's most-starred quadruped platform
🎓 Cited in 20+ academic papers 🌍 Shipped to 60+ Countries
Meet Quaddle - Petoi's do-it-all desk robot dog, and an open-source quadruped you build in an afternoon and reprogram for years. Start with drag-and-drop blocks, then grow into Python, C++, and ROS. Its four servos give it real four-legged movement: it walks, strafes, spins, talks back, and reacts to your touch. One robot that scales from a kid's first STEM project to a researcher's test bench.
What is Quaddle?
Quaddle is a programmable physical AI robot kit - a four-legged(qudruped) robot dog you assemble yourself and control with code. Unlike wheeled robots, it uses four servo motors to walk, turn, and self-balance like an animal. Retro-mechanical legs drive a full knee lift from a single motor, keeping the kit compact and affordable. It runs on Petoi's open-source OpenCat firmware and ships in three models - Builder, Buddy, and Scout - from $99.
Three Quaddles. Pick where you want to start.
Every model can be built from a kit, programmed in Block coding, Python, C++, and runs on open-source firmware OpenCat. Each one adds more on top of the last - reserve now and choose your exact model at launch.
Builder +
Curious kids & beginners
- Walks with 90+ movements and does tricks
- Raspberry Pi Zero socket + Arduino/ESP32 support
- Decorate it with LEGO-compatible blocks and custom 3D-printed parts
The essential open-source robot
MSRP - $179
Buddy
Most people
- Everything in Builder
- Open-domain AI conversation
- Learn & Replay - teach tricks by hand
Talks back, reacts to touch & remembers your moves
MSRP - $219
Scout
Makers, engineers & researchers
- Everything in Buddy
- Gesture, light & infrared sensors
- Most advanced senses light, objects & gestures
The full sensing & research platform
MSRP - $269
Why Quaddle
Most Robots Wow You For a Day, Then Collect Dust
Quaddle keeps surprising you. It talks, reacts to touch, and never stops being customizable and hackable from your desk to a research bench.
Legs Reinvented
A retro-mechanical design drives full knee lifts with a single motor - slashing cost, boosting battery life, and making advanced walking easy to hack.
World's first 4-servo omnidirectional Quadruped
Trots, glides sideways, and does crisp in-place spins - without piling on joints and actuators.
Built to take a hit
100+ resilient motions on an adaptable, research-ready platform built for real-world challenges.
Chat with it
Open-domain AI conversation - ask it almost anything (Buddy & Scout models).
Touch it
Tap Quaddle and it reacts with movements and expressions. Control it from a free mobile app.
Make it yours
Snap on LEGO-compatible blocks, design, print & attach your own 3D-printed parts to personalize Quaddle's look.
No code needed to start
Teach It a Trick with Your Hands
Physically guide Quaddle through any movement tap to record, tap to replay. No code, no app required.
✅ Learn & Replay available on Buddy and Scout
✅ Start with simple tricks, end up mastering robotics without realizing it
✅ Quaddle grows with you - desk toy today, research platform tomorrow
Code it your way
From drag-and-drop blocks to C++ and ROS
Drag blocks on an iPad or Android tablet. Graduate to Python when you're ready. AI helps you along the way.
✅ Block coding → MicroPython → Python → C++ (Arduino IDE) → ROS
✅ Built on OpenCat, cited in 20+ academic papers
✅ Free curricula for hands-on physical AI education — classrooms and self-learners.
Smarter Robot with sensors
Quaddle Scout
The most advanced model for embodied robotics
✅ Senses light, objects, and gestures, then decides how to move.
✅ Compatible with an optional AI vision module for richer perception.
Feature | Quaddle Mini Robot | Bittle X Robot Dog | Nybble Q Robot Cat |
|---|---|---|---|
Servos | 4 (omnidirectional) | 9 | 11 |
Movement | Walks, strafes sideways, spins in place | Dog-like walk, run, backflip | Agile cat-like motion |
Build difficulty - no soldering | Easiest - beginner-friendly. Takes minutes to build, | Moderate - take 30-60 minutes to build | Advanced - no kit option |
On-board AI chat | Yes (Buddy & Scout) | Voice control | Voice control |
Sensors & modules | Built-in gyroscope & PIR sensor | Built-in gyroscope | Built-in gyroscope & ultrasonic distance sensor |
Coding | Blocks, Python, C++, ROS/ROS2 | Blocks, Python, C++, ROS/ROS2 | Blocks, Python, C++, ROS/ROS2 |
Best for | Beginners → researchers | Beginners → researchers demanding feedback servos for precise movement programming | Advanced makers & researchers |
Looking for an open-source robot dog or quadruped robot kit alternative? Quaddle pairs a fully open OpenCat firmware stack with a beginner-friendly, no-soldering build and a price that starts far below multi-servo robots - so you get a hackable research-grade platform without the lab budget or the steep entry point.
Design Your Quaddle - Your Colors Could Become the Real Thing
Try the Color DesignerFeel The Control Of Quaddle - Try Our Simulator
Try the Simulatorback vs buy
Why back Quaddle instead of buying something off the shelf?
Backing a robotics Kickstarter is a fair thing to be cautious about - so here's the honest case. Petoi isn't a first-time team: we've shipped 30,000+ robots to 60+ countries since our Bittle campaign raised $567k, and OpenCat is the most-starred open-source quadruped platform on GitHub. Quaddle runs on that same proven stack.Backing gets you the earliest price (from $154) and a say in the final production details and the campaign is already past its funding goal, so it's shipping. Buying an established desk robot gets you plug-and-play convenience - but a closed system you can't reprogram. If you want an open, affordable, legged companion you can actually code, Quaddle is built by a team that has delivered before.
Quaddle vs. screen-based AI assistants
Quaddle vs. screen-based AI assistants: which feels more alive?
Screen-based companions (and most "AI pets") are a face on a display - they talk, but they don't move. Quaddle is a physical, legged robot: it walks across your desk, balances, reacts to touch, and responds to voice. The difference is presence. A screen assistant lives in an app; Quaddle lives on your desk. And because it's open-source and programmable in blocks, Python, or C++, you can change what it does - a screen assistant only does what its maker allows.
The AI companion that also teaches you to code.
Most AI companions are closed boxes. Quaddle is the one that teaches you to code. Start with Scratch-style blocks, graduate to Python, and go all the way to C++ on real hardware - the same robot grows with you from first block to real robotics. It's a companion and a coding platform in one, built on the open-source OpenCat framework.
Best AI robot companion gift under $300: Quaddle
If you're buying for someone who wants an interactive robot that feels alive, not another screen gadget - Quaddle is a standout. It's an open-source desk robot dog that walks, responds to voice, and can be programmed in blocks, Python, or C++. From ~$154, it's a gift that's playful out of the box and genuinely teaches coding, from a team that's shipped 30,000+ robots worldwide.
See the full video of mobilizing LEGO's Star Wars AT-AT - a display model with no motor
About Petoi Open Source Robots
30,000+
robots shipped worldwide
$1 million+
raised on Kickstarter & Indiegogo
60+
countries
Since 2018
open-source OpenCat platform
Petoi robots are Trusted by makers, STEM teachers & researchers
Frequently Asked Questions
Have a Question? We’ve Got the Answer!
Join 30,000+ Petoi robot owners — be first in line
Reserve your Quaddle - free