Open hardware supply

OpenKit

The parts counter for open hardware. Indexed projects, verified BOMs, and every part in one box.

Explore popular projects Buy a kit

Browse the index

Component Index

Shop by bench

All 51 parts

Complete Builds

Kits with a complete BOM

All eight kits

BOM Import

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 verified stock, flag what needs a human, and put the whole thing in one cart.

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

Try the BOM matcher

TinyPlotter Rev C 11 lines matched

Qty	Component / Line item	Status	Price
2×	NEMA 17 stepper, 0.9°	Matched	$27.00
2×	TMC2209 stepper driver	Matched	$9.80
1×	ESP32-S3 DevKit	Matched	$11.50
1×	GT2 belt + pulley set	Matched	$8.20
1×	MGN12H rail, 300 mm	Matched	$18.40
4×	M3 socket head, 12 mm	Review	$4.80
1×	0.96″ OLED I²C display	Matched	$5.90

13 of 14 lines matched · 1 substitution offered Subtotal: $123.50

Open Hardware Ecosystem

From the field index

All 76 projects

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

Sourcing Assurance

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.

Weekly Bench Notes

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 spam.