Open hardware, sourced properly

The parts counter for open hardware.

OpenKit indexes 76 open-source hardware projects, matches their BOMs to real stock, and ships the parts in one box. Pinouts checked. Licenses respected. Substitutions that actually fit.

New The 76-project field index is open

Pinout-verified License-aware Ships from PDX + RTM 30-day bench returns

51+Parts on the index

08Open kits, complete BOMs

76Projects in the field index

24hDispatch window

Fig. 01 / Index

Shop by bench

All parts

Fig. 02 / Kits

Kits with a complete BOM

All eight kits

Fig. 03 / BOM matcher

Import the BOM.
Skip the six tabs.

Paste a bill of materials, a CSV from KiCad, or a line from a build guide. We match it against the index, flag what needs a human, and put the whole thing in one cart.

01
Paste or drop a BOMReference designators, quantities and vague descriptions are all fine.
02
Review the matchesFuzzy matches are marked, not hidden. Swap any line for an alternative.
03
Send it to the sheetOne cart, one box, one shipping line. Export the matched BOM as CSV.

Try the BOM matcher

ok-bom / tinyplotter-v3.csvrev C

2×NEMA 17 stepper, 0.9°Matched

2×TMC2209 stepper driverMatched

1×ESP32-S3 DevKitMatched

1×GT2 belt + pulley setMatched

1×MGN12H rail, 300 mmMatched

4×M3 socket head, 12 mmReview

1×0.96″ OLED I²CMatched

1×EC11 rotary encoderMatched

13 of 14 lines matched · one substitution offered$123.50

Fig. 04 / Field index

From the field index

All 76 projects

Ranked by community, documentation, maturity and hardware availability.Where to buy the parts · Engineering stack

Fig. 05 / Standards

Sourcing, with receipts

How we check

Pinouts, not guesses

Every breakout is photographed, pinned and checked against the vendor drawing before it reaches the index.

Licenses travel with the BOM

Each kit states its hardware license and what that means for a derivative, a classroom or a small run.

Substitutions with reasons

Out of stock does not mean stuck. See the drop-in, the close-enough, and exactly what changes.

Stock that is actually stock

Counts refresh from the shelf, not from a distributor's optimistic CSV. Backorders say so.

Bench notes / weekly

Have a project that deserves better sourcing?

Send us the repository or the BOM. If it is open, we will index it, check the parts, and tell you what does not add up. One useful email a week, no growth hacks.