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Thanks!

For internal part numbers, are you wanting to assign internal part numbers for components (like connectors, etc.) used in an assembly or an internal part number to the assembly itself?

An internal part number for the assembly is coming soon, but the internal part numbers for individual components is not something that's planned right now.

Currently, all wires in a bundle (all wires between the same two connectors are part of a bundle) are forced to have the same length. Do you want to override that?

The connector graphics are not currently exported to WireViz YAML, so you'd have to re-link them manually with your own image file. The ability to download a zip with the graphics included is in the works.


Thanks for pointing this out!


Interesting application - not sure the visualization currently lends itself well to that. My first approach would be to make the modules components and then arrange them to mimic the actual appearance. We don't currently have text on the component creator so labeling may be tough.

I'll put something together with the current features and share here.


Hi -

Download as in run the app locally or download a design?

If the former, that's not currently possible.

If the latter, you can use the Download button on the harness builder (top floating button menu) to choose an available format for an engineering drawing, diagram, or BOM or choose JSON or WireVIZ YAML; see the Export and Documentation section here: https://splice-cad.com/#/tutorial


Thanks Chris!

I intend to keep the current functionality (50 harness/assembly designs per account) free. A collaboration feature is coming soon that will allow creating teams and sharing harnesses with specific accounts - we may charge here at some tier but this is TBD.

I was unaware of the YC company (https://www.loombotic.com/ I think) - thanks for pointing me to it.


Thanks Nick - I'm a fan of your site. Email coming your way.


:( I bungled the tutorial URL: https://splice-cad.com/#/tutorial


How do you mean? The trailing slash? I just removed it but let me know if you you need it (or anything else) changed in some other way.


Yes, the trailing slash - thanks for fixing it!


Hi all -

Nate, thanks for sharing this - I actually posted this over here (https://news.ycombinator.com/item?id=44417587) a few days ago.

Regarding pricing, etc. - right now we're limiting users to 50 harnesses per account. There are no plans to charge for usage below this amount with the current features. I'm hoping people find the tool useful and we can use the feedback to improve it.

You can can get in touch here: [email protected]

Re mate vs wire side, that's just my preference - no ambiguity in orientation!


Thanks for the reply! If this information were available on the landing page, I'd have felt a lot more comfortable investing the time to try the tool out. I do appreciate how far you can explore even without an account.

Couple more ideas for the landing page:

- Provide links to examples of generated exports in the formats you support, so folks can get a feel for how it might integrate into their workflow.

- The elements under "Everything You Need for Cable Design" animate as though they're interactive, but clicking them does nothing. Confused me for a bit.

- Page is very hard to read on mobile.

Other thoughts:

- I wasn't able to figure out how to pan the editor view around.

- Adding some sort of json/yaml/xml import/export would open up a lot more workflow possibilities. For example, I want to associate a harness version with a git tag, without needing to manually make a copy of a harness version in the app. Git (and/or github) integration would be great. Honestly, even an opaque blob export would be tolerable.


Thanks for the feedback, Gia - we were able to get a couple of the items on your list fixed in an update today.

To pan, click and hold the right mouse key (or wheel) and drag. Are you trying this from a tablet?

There’s now a blog section on the site: https://splice-cad.com/#/blog/splice-updates-july-2025 where we’re documenting changes, fixes, and future plans. The feedback from this post has been very helpful.


Super, I'll check it out. I'm on Firefox in Linux (Kubuntu) using a plain old mouse - pretty sure I tried a right click pan. I tried again and it still didn't work. Also- clicking around on the canvas I get: Uncaught ReferenceError: TouchEvent is not defined Ks https://splice-cad.com/assets/SvgPage.zgJCQbB-.js:302 Ia https://splice-cad.com/assets/SvgPage.zgJCQbB-.js:302


Finally fixed, along with some more updates here: https://splice-cad.com/#/blog/splice-updates-july-20-2025


Thanks for reporting, Gia - we added a repo to track issues on Github here: https://github.com/splice-cad/splice-cad-app/issues


Looks great! Your editor design is beautiful.


I've been working on Splice CAD – an in-browser cable-harness designer.

https://splice-cad.com

Building cables for multiple personal and professional projects, I was frustrated by having to cobble together harness diagrams in Illustrator or Visio, cut snippets from from PDFs for connector outlines, map pin-outs, wire specs, cable constructions, mating terminals, and manually updating an Excel BOM.

Splice gives you:

An SVG canvas to drag-and-drop any connector or cable from your library to quickly route and bundle wires. Assign signal names to wires or cable cores.

Complete part data Connector outlines, pin-outs, terminal selections (by connector family & AWG), cable core colors & strand counts, wire AWG/color.

Automated BOM & exports parts-ready diagrams, wiring drawings, and a clean BOM in SVG, PNG, or PDF.

Connector & Cable Creators. Connectors or cables not in the existing library can be added with an optional outline and full specs (manufacturer, MPN, series, pitch, positions, IP-rating, operating temp, etc.), then publish privately or share publicly.

Demos & tutorials: Harness Builder → https://www.youtube.com/watch?v=JfQVB_iTD1I

Connector Creator → https://www.youtube.com/watch?v=zqDsCROhpy8

Cable Creator → https://www.youtube.com/watch?v=GFdQaXQxKzU

Full tutorials → https://splice-cad.com/#/tutorial/

No signup required to try—just jump in and start laying out your harness: https://splice-cad.com/#/harness. If you want to save, sign up with Google or email/password.


Continuing to make some additions and changes to ease use and improve the appearance of the harness design:

[1] Added many standard DSub, M8/M12, and USB connector outlines/pin arrangements to aid in the creation of connectors not currently in the library

[2] In concert with the addition of more connector outlines, added a Magic Button on the Connector and Cable Creator pages that pulls all fields for an entered MPN from Digikey or Mouser. Now, you can just enter your part number (like CDM806-04A-MP-F011-67 for this CUI connector, https://www.digikey.com/en/products/detail/same-sky-formerly...) and the fields will populate automatically. If a standard outline is recognized, you have the option to load the outline and pin arrangement too. For cables, this will pull the core count and other cable properties.

[3] The Harness Builder now features a grid and snap-to functionality to align items. You can also share a link (ie, https://splice-cad.com/#/shared/lgcy2htze9zlqs4igdgycfncy98f...) to a harness design that a collaborator can view or clone/edit).


omg, I wish there was a service like jlpcb / pcbway but for cable harnesses.. do you know of any? I'd love to take something like your tool and choose length and quantity and order it....


Thanks for the comment...yes, I've had that thought many times. There's on demand fab for about everything else, but no low-volume cable house with auto-quoting and a nice design interface.

Check out https://www.hi-harnesses.com/ - limited parts at this point but the closest thing I know of.


thanks i will check them out.


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