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Show HN: Splice – CAD for Cable Harnesses and Electrical Assemblies

Show HN: Splice – CAD for Cable Harnesses and Electrical Assemblies

4 comments

·August 21, 2025

I first posted Splice CAD as an in-browser tool for making cable harnesses.

Since then it’s grown in both features and scope — the direction is moving from “harness-only” toward a lightweight CAD for wiring and electrical assemblies. New functionality includes:

Editing Enhancements

- Full undo/redo to easily restore editor state

- Multi-select & group actions to move, delete, and add components

- Bulk connect tool to create straight-through, crossover, or custom wiring patterns quickly

- Multiple connections per pin allow for daisy chains, etc.

Documentation Additions

- Multi-page PDF configurator to add A2, A3, or A4 pages for engineering drawing downloads

- WireViz YAML export (generate WireViz diagrams directly: https://www.danielrojas.net/projects/wireviz)

Library and Component Additions

- Expanded beyond harnesses to include categories for more applications: connectors, cables, breakers, fuses, switches, motors, power supplies

- Magic MPN button in the Component Creator to auto-fill specs from part numbers

Try it out, no signup: https://splice-cad.com/#/harness

Docs & tutorials: https://splice-cad.com/#/tutorial

Visit

nickpinkston

This looks great and well designed.

If you want a bigger parts library, let us know at Volition:

https://govolition.com/

nick@govolition.com

djsdjs

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

tomhow

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.

djsdjs

Yes, the trailing slash - thanks for fixing it!