The cheapest open-source humanoids to build

Last updated: 21 October 2026.

Two-legged robots you can build yourself, cheapest first, with the cost as their creators state it. What a cost covers differs from one project to another (shipping, filament, tools, a phone or a computer may be left out), and prices change: read each creator's note before you buy. Only robots with an open license file are listed.

RoboPrime
“The total cost is about $60-$100” (README)
≈ €53–89 · GPL-3.0 · 21 joints · Buildability 69
Its repository includes a Windows program (AnimHelper.exe); its page says so.
Bambot
“low-cost humanoid ($300)” (README)
≈ €267 · Apache-2.0 · Buildability 58
Open Duck Mini v2
“The full BOM cost should be under $400” (README)
under ≈ €356 · Apache-2.0 · 42 cm · Buildability 85
two-legged duck
PhoneBot
“approximately $400 excluding the phone” (project page)
≈ €356 + a phone · CC BY-NC 4.0 (hardware) · 48 cm, 1.8 kg
not on Robotheca yet
Microban
“the total cost of the robot is kept relatively low ($550-$600)” (README)
≈ €489–534 · CC BY-NC-SA 4.0 · 30 cm · Buildability 94
Endeavor II
“the cost of this robot ranges between $600 to $800” (README)
≈ €534–712 · MIT · 50 cm, 4 kg · Buildability 69
NanoLoong
“The cost of the whole machine is less than 15,000 RMB” (README)
under ≈ €2,000 · Apache-2.0 · 60 cm · Buildability 70
ToddlerBot
“keeping the total cost under 6,000 USD” (paper, arXiv 2502.00893)
under ≈ €5,340 · MIT · 56 cm, 3.4 kg · Buildability 60
Roboto Origin
“TOTAL: 49713 CNY” (parts list)
≈ €6,630 · CERN-OHL-W-2.0 / GPL-3.0 · full size · Buildability 87
Poppy Humanoid
“Building a complete Poppy Humanoid costs $8000-9000” (README)
≈ €7,120–8,010 · CC-BY-SA-4.0 / GPL-3.0 · Buildability 68

Open-source humanoids, cheapest first, with their creators' stated costs
Robot	Size	The creator says	≈ €	License	Buildability
RoboPrimeIts repository includes a Windows program (AnimHelper.exe); its page says so.	21 joints	“The total cost is about $60-$100” (README)	53–89	GPL-3.0	69
Bambot	–	“low-cost humanoid ($300)” (README)	267	Apache-2.0	58
Open Duck Mini v2two-legged duck	42 cm	“The full BOM cost should be under $400” (README)	under 356	Apache-2.0	85
PhoneBotnot on Robotheca yet	48 cm, 1.8 kg	“approximately $400 excluding the phone” (project page)	356 + a phone	CC BY-NC 4.0 (hardware)	–
Microban	30 cm	“the total cost of the robot is kept relatively low ($550-$600)” (README)	489–534	CC BY-NC-SA 4.0	94
Endeavor II	50 cm, 4 kg	“the cost of this robot ranges between $600 to $800” (README)	534–712	MIT	69
NanoLoong	60 cm	“The cost of the whole machine is less than 15,000 RMB” (README)	under 2,000	Apache-2.0	70
ToddlerBot	56 cm, 3.4 kg	“keeping the total cost under 6,000 USD” (paper, arXiv 2502.00893)	under 5,340	MIT	60
Roboto Origin	full size	“TOTAL: 49713 CNY” (parts list)	6,630	CERN-OHL-W-2.0 / GPL-3.0	87
Poppy Humanoid	–	“Building a complete Poppy Humanoid costs $8000-9000” (README)	7,120–8,010	CC-BY-SA-4.0 / GPL-3.0	68

Non-commercial licenses: Microban (CC BY-NC-SA 4.0) and PhoneBot's hardware (CC BY-NC 4.0) may be built and shared, not sold.

Left out: robots that state a cost but have no license file (so they are not open source), and humanoids whose creators state no cost. All humanoids are in Explore.

How to read the table. Buildability is Robotheca's score of how completely a robot is documented (how we score). On each robot's page, the parts list can be multiplied for several robots (“Robots to build”).

Euro amounts use the ECB rate of 21 October 2026 (1 EUR = 1.12 USD = 7.50 CNY), for comparison only.