From bundle route to build sheet, without the five-figure CAD seat.
Draw bundles, drop splices and clips, and get a 1:1 formboard drawing, connector tables and a BOM your floor can build from. No installer, no Excel copy-paste.
Catch the build errors before the harness hits the board
OneHarness checks the design as you work and flags what a technician would find the hard way: a wire end with no terminal, an empty cavity, two wires in one cavity, a bundle with no covering, twisted pairs of different gauges, a part without a part number.
Every wire, terminal and millimeter of tape, counted for you
Draw the harness and the wire list fills in: from, to, terminal, color, gauge, type and cut length. The BOM rolls up connectors, terminals, seals and locks, splices and heat shrink, clips, shielded cable by length, wire by color and gauge, and covering lengths.
Show the technician exactly how each clip sits
Place a fir-tree clip on a bundle and add a section cut. OneHarness draws the section view on the sheet, labeled A-A, B-B, so orientation on the board is never a guess.
Built for the harness bench, not the whole electrical stack
OneHarness does one job: turn a harness layout into documents a technician can build from on the first try.
1:1 formboard drawings
Print at true scale on ARCH sheets, tiled across pages when needed, with the title block filled in.
Splices, clips and coverings
Ultrasonic splices with heat shrink, fir-tree clips from a library with automatic section views, convolute and overlap tape with an insulation legend.
Connector tables on the sheet
Pin, wire ID, color, gauge, terminal, plating and twist sit next to every connector.
Real part numbers
Housings, terminals, secondary locks and shielded cable carry supplier part numbers into the BOM.
Clean revision history
Create a version before each release and keep Rev A and Rev B straight.
Nothing to install
Runs in the browser. Every update reaches you the moment it ships.
Pricing
Start free. Upgrade when your harnesses outgrow it. Annual plans save 15%.
Free
- 3 harness designs
- 20 connections per harness
- Manufacturing-ready documents
- 1:1 formboard drawings
- Schematic editor (coming soon)
Standard
- Unlimited harness designs
- 500 connections per harness
- Manufacturing-ready documents
- 1:1 formboard drawings
- Schematic editor (coming soon)
- Cancel any month
Pro
- Everything in Standard
- 5,000 connections per harness
- Schematic-to-harness sync (coming soon)
- Priority email support
- Feature requests reviewed first
Team licenses
Five users per license, one invoice, one admin. Annual plans save 15%.
Standard Team
- Everything in Standard for 5 users
- Unlimited harness designs
- 500 connections per harness
- Schematic editor (coming soon)
- One invoice for the whole team
Pro Team
- Everything in Pro for 5 users
- 5,000 connections per harness
- Schematic-to-harness sync (coming soon)
- Priority email support
- One invoice for the whole team
First 3 team licenses
on annual plans
Cancel anytime. You keep access until the end of the period you paid for. Not sure yet? Start on the free plan first.
Questions engineers ask first
Who owns my designs?
You do. Export your drawings and manufacturing data at any time, on any plan.
Can I print the formboard at full size?
Yes. Drawings export to PDF at 1:1 scale on standard ARCH sheet sizes, tiled across pages when needed.
How does billing work?
Payments are processed by Paddle, our reseller, which handles cards, invoices and sales tax. Cancel from your account whenever you want.
Is a schematic editor coming?
Yes. A logical schematic editor for circuits, connections and wire data is in development and will be included in every plan. Pro adds sync: define a connection once in the schematic and it flows to the harness drawing, wire list and BOM, and changes stay in step both ways. Founding customers get early access to both.
Draw your next harness in OneHarness this week.
Start on the free plan, or book 15 minutes and I will walk you through a real harness and answer questions about your workflow.