Feature List

This list is intended to drive development by breaking down high-level functional requirements into individual features that can be developed and integrated into the app piece-by-piece. This list is not organized by priority, or what will be included in an MVP.

General Application

• Cross-platform availability

  • Web app (via browser)

  • Offline native app (Electron-based for Windows/Mac/Linux)

• Local file-based storage

  • Human-readable YAML or JSON formats (.wh_proj, .wh_sch, etc.)

  • Autosave and manual save with "dirty" state tracking

  • No cloud storage, fully local and portable

• Git-friendly file structure

  • Files are structured to minimize merge conflicts

  • Semantic versioning support for projects

  • Optional wh.gitignore file for good repo management

• Undo/redo history system

  • Immutable state editing (copy-on-write)

  • Unlimited undo/redo stack with timestamps

• Extensible API for LLM integration

  • Fully documented JSON-based harness schema

  • Exposed API hooks for LLMs to generate/edit harnesses

  • Sandbox mode for simulated LLM-generated edits

• Responsive UI and theming

  • Light/dark modes

  • Zoom/pan for canvases

  • Layouts that adapt to screen size and OS

Project Data

• Project creation and loading

  • Start from scratch

  • import .wh_proj

  • Import from external netlists or ECAD exports

• Project metadata

  • Name, description, tags

  • Versioning, author, date

• Multi-sheet (hierarchal) schematic support

  • Tabs or hierarchical tree view

  • Cross-sheet net referencing

• File structure

  • project.wh_proj – entry point

  • schematic.wh_sch, layout.wh_2d, layout.wh_3d, components.wh_lib, etc.

• Multiple Harness Configurations

  • Create multiple versions of the harness schematics to support different features / changes.

  • The default editing context will apply to all configurations. Switch context to specifically edit a certain config. These edits will automatically be highlighted in output files (PDF harness schematics)

  • This feature is particularly used in automotive environments.

Schematics

• Object placement and editing

  • Drag-and-drop wires, terminals, connectors

  • Rotate, group, align

• Netlist editing

  • Manual entry or import from ECAD tools

  • Auto-generate nets from wire connections

• Labeling and annotations

  • Add net names, wire IDs, comments

  • Auto-label wires based on netlist or config

• Schematic snapping and grid system

  • Adjustable grid size

  • Smart alignment and spacing tools

• Copy/paste support across sheets

  • Clipboard integration

  • Object duplication with ID reassignment

Components

• Component creation wizard for manual creation

  • Define pin count, layout, gender, mount type

  • Assign part number and metadata

• Auto-generation of components from datasheet.

  • Use pre-trained LLM datasheet reading model to populate the creation wizard

  • dragging a datasheet directly into the canvas will active the wizard

• Wire types and attributes

  • Define gauge, insulation, color, voltage rating

  • Include mechanical and electrical specs

• Splices, terminations, breakouts

  • Specialized parts with rule-based usage

• Reusable component templates

  • Save user-created connectors and wires for future use

  • Allow users to save common bundling / looming schemes so they can be easily re-applied

Libraries

• Local component library system

  • Stored in components.wh_lib

  • User-editable JSON/YAML format

• Distributor API integration with search in-app

  • Octopart

  • Digikey

  • Mouser

  • Auto-fill metadata and datasheets

• Part metadata fields

  • Manufacturer

  • part number

  • specs, RoHS compliance, cost, etc.

• Library import/export

  • Share part libraries across users or organizations

2D Routing

• 2D layout editor

  • Draw bundles, wires, branches

  • Add mounting points and clamps

• Connector positioning and orientation

  • Define physical location and rotation

  • Mirror/layout tools

• Routing path tools

  • Auto-bundle wires by shared route

  • Manual and assisted routing

• Length estimation

  • Auto-calculate length of each wire

  • Include slack or tolerance factor

3D Routing

• Import 3D assemblies

  • Load vehicle or system geometry

  • STEP import

  • IGES import

• Route harness in 3D

  • Drag wires through mounting points

  • Define cable path constraints

  • harness bend radius limitations

  • Define component locations (connectors, devices)

  • intuitive 3D interaction with wires

• Auto-flatten to 2D harness board

  • For drawing harness build boards from 3D route

Design Rule Checks

• Pop up to easily set up DRC at the creation of a new project

• Schematic DRC

  • Unconnected pins

  • Open nets

  • Invalid net labels

  • Short circuits / net overlaps

  • Incompatible wire size with connector

  • Solder connection identification (ex:, notify if solder cup connectors violate rule for no soldering set by user)

  • unnecessary wire size change (ex: 20 awg goes to 18 awg without splicing)

  • inconsistent labeling

  • inconsistent wire colors

  • connector missing components (TPA, terminals, boots, key, plugs, etc)

  • incompatible connector mating (keying issue, pin - pin, etc)

• 3D Layout DRC

  • Wire length limits (voltage drop limit)

  • Unsupported bend radius

  • unsupported harness (length / weight limits between mounting points)

  • Missing strain reliefs

• Library validation

  • Incomplete component metadata

  • Deprecated parts warning

Project Data Exports

• Bill of Materials (BOM)

  • CSV export with part data and quantities

• Wire / cut-list

  • Pin-to-pin wire mappings with length, color, gauge

• Schematic PDF export

  • Printable format for documentation

• DXF export for 2D layouts

  • Send to vendors or import into CAD tools

• 3D harness export (future)

  • STEP file generation from 3D routing