Open source PCB designs you can simulate
22,480 boards
Every public KiCad project we can find on GitHub, with its processor, full parts list and a render of the board. Any of them can be brought up in simulation: open one and run firmware on it before you order a single PCB.
TMS9918A
jblang
99.1 × 49.9 mm36 parts2LNo license145
68000
jefftranter
134.6 × 208.3 mm90 parts2LNo license132
Vic2020mainboard
danwerner21
357.8 × 124.5 mm127 parts2LNo license78
CGA Redux
hkzlab
337.6 × 105.7 mm168 parts4LCC-BY-NC-4.056
Zeta sbc
skiselev
170.2 × 100 mm74 partsGPL-3.051
TEC-1G
MarkJelic
63.5 × 85.6 mm31 parts2LGPL-3.046
Zx2022
michalin
100 × 100 mm34 parts2LGPL-3.041
C128-mmu-256k exp
ytmytm
48.3 × 90.2 mm12 parts2LMIT26
RetroZ SBC for S80
formix
127 × 73.7 mm48 parts2LApache-2.022
New enet
jayacotton
254 × 134.6 mm36 parts2LMIT21
ISA DualUARTParport
176.5 × 90.2 mm69 parts2LCC-BY-NC-4.018
Zx81-external eprom
zxinfo-diy-electronics
60.3 × 52.4 mm13 parts2LNo license7
Kraft80 REV2.2
ARMCoderBR
150.6 × 171.7 mm150 parts2LGPL-2.05
Atari65 130XE C070067
jimbro1000
323.9 × 204 mm327 parts4LNo license4
Mainboard
mianderson2469
101.4 × 137.7 mm33 parts2LNo license3
WZ80 IO Board
makesthingsxyz
74.9 × 110.5 mm22 parts2LMIT3
JFF
herraa1
250 × 150 mm132 parts2LGPL-3.02
Peoples permacomputer
genossen
208.3 × 146.1 mm121 parts2LCustom license2
XOSERA RCBUS
codesmythe
101.6 × 55.9 mm48 parts4LCC-BY-NC-4.02
SVI-2017
patricklaf
100 × 100 mm40 parts2LNo license2
C128-u3-replacement
21.5 × 37.3 mm5 parts2LMIT2
6502PC
244 × 244 mm154 parts2LNo license1
Cpu board 03
sim82
99.1 × 94.2 mm63 parts2LMIT1
SBC 8080 ECB
sladek
160.5 × 100.2 mm111 parts2LNo license0
68k-SBC
transistorfet
154.9 × 139.7 mm72 parts2LGPL-3.069- schematic only · 26 parts
Spies-Labs-NicePrint-Card
markadev
26 parts2LNo license23 
AVR/ArduinoRetroZ-disk
76.2 × 73.7 mm22 parts2LApache-2.022- schematic only · 34 parts
S100 enet
34 parts2LMIT21 
RC202-68000 SIO 1
MarkD833
101.6 × 53.3 mm40 parts4LCC-BY-NC-4.08
Svi coleco adapter
popolonx
250 × 100 mm70 parts2LNo license7
AlphaPlus
150.6 × 110.4 mm78 parts2LGPL-2.05
Project RackZ80 - Serial RS232
jkreucher
160 × 100 mm42 parts2LGPL-3.02
Cpu board 03 4l
99.1 × 94.2 mm62 parts4LMIT1
TRS-80 Color Computer 3
baldengineer
280 × 155.3 mm204 parts2LCC-BY-4.0442
AVR/ArduinoRC6502 Terminal
tebl
99.1 × 81.9 mm45 parts2LGPL-3.0192
Z80CTCDART2
lynchaj
100 × 100 mm73 parts2LNo license31
About these open source PCB designs
Every board here is a published hardware project: a public GitHub repository with KiCad design files and a bill of materials. HardLabs reads those files directly — the board outline for its size, the copper layers, every footprint for the parts list — and draws the render from the layout itself, so what you see is the design as committed rather than a product photo.
Boards are indexed by the microcontroller they are built around, by what they are for, and by every IC and module on them. That makes the gallery a quick way to find a reference design: look up a part number to see how other engineers power, decouple and connect it.
Using an open source board as a reference design
- Find boards built on your chip or with the part you are designing around.
- Compare their size, layer count and bill of materials, and open the KiCad files on GitHub.
- Check the license before reusing any of the design.
- Simulate the firmware on HardLabs to test your changes before you order a PCB.
Open source PCB designs: common questions
What is an open source PCB?
A printed circuit board whose design files — schematic, layout and bill of materials — are published for anyone to study and, depending on the license, to modify and manufacture.
Are these PCB designs free to use?
It depends on each project's license. Open hardware licenses such as CERN-OHL and CC BY-SA, and software licenses such as MIT, allow reuse on their terms; a repository with no license keeps all rights with its author. Every board page shows its license.
What design files do the boards come with?
They are KiCad projects: the .kicad_pcb layout and the schematic (or a netlist from older KiCad versions), plus a bill of materials, usually a CSV. Each board page links to those files in the original GitHub repository.
How do I find boards that use a specific part?
Search for the part number, or open the part's page from the list of parts. It shows every board built with that part and the parts most often used alongside it.
How many boards are there, and how often is the list updated?
22,480 boards from 11,293 repositories today. New projects are found and added every night.
Can I test a board's firmware before ordering the PCB?
Yes. HardLabs builds a simulation of a board from its netlist and BOM, so you can boot and debug firmware against it with no hardware on your desk.