Cable Harness Design Made Simple

Splice is a web-based harness configurator that enables simple graphical design and documentation of cable and electrical assemblies.

Start Designing View Tutorial

Layout View - Assembly documentation in Harness Builder

Complete Design Environment

Integrated canvas, parts library, and bill of materials in one interface

auto_awesome AI Generator

Text-driven harness assembly generation

Use AI to get close to your target design

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Try these examples:

code Web Embed

splice-embed

Embed Splice's interactive harness viewer in your web applications.

check React/Vue/Vanilla JS

check Interactive SVG viewer

check Zero dependencies

View on GitHub open_in_new

terminal Python Library

splice-py

Python library for programmatic harness creation and automation.

check Python 3.8+

check Full API access

check Batch operations

View on GitHub open_in_new

Explore Examples

Jump right in with these harness and assembly designs from different industries

CNC Router Control System

CNC

Complete wiring harness for a CNC router powered by Brookwood Design's Teensy 4.1 grblHAL board. Includes stepper motor controller and motor connections and spindle control.

precision_manufacturing CNC Control

Open Design

Protected DC Power Distribution

DC Power Distribution

Industrial power distribution schematic stepping down AC line voltage to dual protected DC branch circuits. Features circuit breaker protection and safe distribution to downstream loads.

electrical_services Power Systems

Open Design

Garmin GNS430 to Dynon Interface

Avionics

Aviation interface harness connecting Garmin GNS430 GPS/NAV/COMM to Dynon SV-ARINC-429 glass cockpit system.

flight Avionics

Open Design

Harness Builder

Design complete cable harnesses with our drag-and-drop interface. Place connectors, route wires and cables, assign signals, and generate documentation.

Interactive SVG canvas
Smart wire routing
Automatic BOM generation
Export diagrams, BOMs, and engineering drawings

Harness Builder

Component Creator

Create custom components across multiple categories when parts aren't in our library. Design connectors, motors, relays, power supplies, and industrial components with flexible pin layouts.

Connectors & terminals with custom pin layouts
Motors & drives with power and control connections
Relays, contactors & switching components
Power supplies & conversion modules
Template library for common footprints

Component Creator

Cable Creator

Define multi-core cables for your harness designs. Specify conductor properties, insulation, and jacket materials.

Multi-core cable definition
Wire specification library
Material documentation

Cable Creator

draw

Interactive Canvas

Drag-and-drop interface for placing connectors and routing wires. Real-time visual feedback with SVG-based rendering.

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Parts Database

Expanding library of connectors, wires, and terminals. Full-text search with manufacturer specifications.

description

BOM Generation

Automatic bill of materials creation with accurate part counts and specifications for procurement.

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Export Options

Export your designs as high-resolution SVG, PNG, or PDF files ready for manufacturing documentation.

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Version Control

Built-in revision tracking keeps your design history safe and allows easy rollback to previous versions.

Smart Search

Fuzzy search and filtering help you find the exact parts you need from thousands of components.

Supported Connector Manufacturers

Our expanding parts database includes connectors from leading manufacturers

Manufacturer	Series
JST Sales America Inc.	ACHACHFBDBHEHGHNHPAPHSHSMVHXHZH...and 90+ more
Molex	Micro-Fit 3.0Mini-Fit JrMini-Fit SrNano-FitPico-LockPicoBlade
Samtec Inc.	Mini Mate®Micro Mate™Tiger Eye™Power Mate®
Tensility International Corp	M8M12M5
TE Connectivity AMP Connectors	AMPLIMITEAMPMODUMIL-DTL-24308