Closed hardware
Bittle / Bittle X
Petoi · Quadruped · active · 2020
Palm-sized servo-driven robot dog kit for STEM education running the open-source OpenCat framework; Bittle X is the current version.
Two ways to get Bittle / Bittle X
Compare all →- Drawing
- /petoi/bittle
- Maker
- Petoi
- Country
- Pittsburgh, US
- Package rev
- none
- Level
- L1 Compiled
- Availability
- Kit
- Openness
- 45/100
- HW licence
- unknown
- Last checked
- 2026-09-24
- Mass
- 0.29 kg
- Actuators
- PWM servos
Only the firmware/software (OpenCat) is open: GitHub reports MIT while Petoi's site says GPL3+. Injection-molded frame CAD not found published, so cad/bom=false. Runtime ~1 h walking per New Atlas. OpenCat repo was renamed from PetoiCamp/OpenCat. A simplified URDF (bittle_simple.urdf/.xml) is in Resources/SimulationModels.
Build · not possible
Build it. Buy it, or build something like it.
Closed hardware; no public CAD or BOM.
- Availability
- Kit
- Indicative price
- unknown
- Price note
- US$195 on the 2020 Kickstarter; see Petoi store for current Bittle X price
Open robots of similar size you can build
- Aero Hand Open/chestnut/aero-hand-open · 0.389 kgL2
- AmazingHand/pollen/amazing-hand · 0.4 kgL1
- Solo-12/odri/solo-12 · 2.5 kgL1
- Pupper v3/stanford/pupper-v3 · 3 kgL1
Nearest by height and mass where both are known; otherwise same class. Size comparison only, not capability.
Level gate
Holds L1 · evidence, not confidence- L0Indexed
Known to exist. Atlas page only.
- 4 sources on record(met)
- L1Compiled
Package validates against the spec; every fact has a source.
- No build package compiled(not met)
- 4 sources across robot and package(met)
- L2Sim-verified
Loads in browser and GPU sim, mass within tolerance of the BOM, holds a stand. Unlocks .training.
- URDF/MJCF is public(met)
- Sim load, mass tolerance and stand are checked on .training(checked elsewhere)
- L3Sourced
Every BOM line resolves to a live offer in at least two regions. Unlocks the one-click cart.
- Not reachable: no open hardware to source or build.
- L4Built
At least one community build report with photos and bring-up logs. Unlocks Build it as the main action.
- Not reachable: no open hardware to source or build.
- L5Certified
The robot's maintainer signs the package. Unlocks certified teams and kit sales.
- Not reachable: no open hardware to source or build.
Levels are cumulative and set by the registry from reviewed evidence. This panel shows what can be measured from the package today.
Same robot, other verbs
- Know ithumanoidrobots.systems/petoi/bittle
- Build ithumanoidrobot.buildClosed hardware; no public CAD or BOM.
- Train ithumanoidrobots.training/petoi/bittle
- Find its crewpartialhumanoidrobots.team/petoi/bittleOwners and labs, not builders.
- See it on the mappartialhumanoidrobots.earth/petoi/bittleOwned units, not builds.
Revisions and sources
Every fact on this sheet traces to one of these| Rev | Description | Checked |
|---|---|---|
| PKG | No build package compiled | — |
| S1 | New Atlas: Bittle Kickstarternewatlas.com | 2026-09-24 |
| S2 | OpenCat repogithub.com | 2026-09-24 |
| S3 | BBC Science Focus reviewsciencefocus.com | 2026-09-24 |
| S4 | Petoi Bittle X product pagepetoi.com | 2026-09-24 |