harness.design - web-based wire harness CAD tool for EV builders

[anonomouse]

Some Background

I've been lurking on Endless-Sphere since 2015, and it was my go-to resource for learning about electric vehicles. I'd spend hours diving deep into liveforphysics' posts on brushless motor tuning, troubleshooting some esoteric controller quirk, or reading up on different ways to fit a ridiculously heavy hub motor into the back of an old Giant DH Comp. At the time there just wasn't anywhere else to learn it.

That eventually led me to a job in the industry designing electric motorcycles for a startup in NZ.

The Problem

When I got to that work, I was struggling to find the right software to design the harness. What I found was either expensive enterprise tools or legacy desktop applications built for large engineering teams. Nothing that actually worked for someone like me, just trying to get a harness designed and documented.

So my friend Avario and I built harness.design

The Pitch

harness.design is a web-based CAD tool for designing wire harnesses. It's fast and visual by design. Instead of filling out tables or clicking through menus, you work directly on the canvas: dragging, connecting, and arranging your harness interactively. The result is a clean, readable design you can produce in a fraction of the time, whether you're building a custom e-bike, converting a car, wiring a motorcycle, or anything else that needs a harness.

Being fully web-based means there's nothing to install. Just open a browser and start designing.

We launched the beta in October 2025 and hit full release in April 2026.

Try it out

If you're working on a project that needs a harness, I'd love for you to give this a try and build something with it. Tell me what's missing, broken, or annoying.

-Sam

harness.design

 

[neptronix]

It's not a product i'd use but it's neat for what it is, and the free plan looks decent.


I build web pages for companies as part of my business and here's some feedback:

- This video about how it works? put that on your landing page. The faster you can show the product in action, the sooner the consumer can decide if it's for them. An animated gif could also work.

- I would also put this pitch on the webpage. The back story is interesting. It includes the human element, which is refreshing in this age of inauthenticity. The text also fits in a nice 3 column layout

Good luck on your quest!

 

[anonomouse]

Hey, thanks for the feedback!

We used to have the video as the default hero element on the home page, but recently changed it to an embedded interactive version of the app. But I totally agree with you. We're sort of thinking maybe the best approach is creating a specific video for the landing page that's more about showing it off than teaching the user how it works.

That's an interesting thought about putting the story/pitch on the webpage. I feel like the story particularly resonates here, as there is a genuine connection with this community. Maybe we can find a way to put something similar, but slightly modified, onto the website.

 

[mrmojorising]

This is awesome, I remember seeing a tiny snippet of this on the business's Instagram/Facebook story and thinking the UI was super clean and straightforward. Glad to see it being put out there! Guess I'll have to start a new project to give it a test

p.s. big fan of your team's attention to detail and clean, robust design. Without doxxing, I'm very keen to see your upcoming bike, I was lucky to have a sneak peek at some renders when chatting with Ian

 

[anonomouse]

Hey, thanks! It's a small world!

The UI is something we've put a lot of thought and care into, so it's really nice to hear that comes through!

The Arlington build is coming along well, I'm pretty excited about getting it out there. Ian will have to do a post here once it's done and share the story. The thing should rip.

Would love to hear what you think if you do get a chance to give it a go! (The bike and the software )

 

[bananu7]

This looks really cool. I'll try to use it with the upcoming rewiring of my bike, but it looks like it might do exactly what i need.

 

[anonomouse]

This looks really cool. I'll try to use it with the upcoming rewiring of my bike, but it looks like it might do exactly what i need.

Thanks! If you use it let me know what you think and if there is anything we can improve on!