Overview
LoomFlow is a schematic-first harness editor I build and use on the FSAE
electrical bench. Connectors are nodes, cavities are pins, and wires are a drag
away — edit the connections the way you think about them and every derived
artifact (BOM, cut list, per-connector pinouts, and print-style drawing sheets)
updates itself. It runs fully offline, stores a whole harness in a single
portable .loomflow file, and syncs to the cloud only when you want it to.
Why it exists
Nothing else combined a direct-manipulation editor with files you actually control. Form-driven tools make you hunt through dialogs to change one wire; YAML-driven tools mean no canvas. LoomFlow keeps the schematic as the single source of truth and derives everything else from it.
Highlights
- Drag-to-connect schematic canvas — group wires into signals, twist pairs, add shields and inline splices; edits stay fluid because the design is connections, not spreadsheet rows.
- Built-in manufacturer library — 1,600+ connectors across 56 manufacturers (Deutsch, TE, Molex, Amphenol, Aptiv, JST…) with mating faces, contacts, seals, cavity plugs, and current ratings. Place a part and the pinout and BOM come pre-filled.
- Checks an EE would actually run, live while editing — per-cavity ampacity from contact and wire gauge, bundle derating by conductor count, one-way voltage drop, crimp-range warnings, and duplicate-pin validation.
- Drawings that draw themselves — one-click export of print-style technical drawing sheets (whole layout or per-harness), plus BOM and cut list, to PDF, SVG, and CSV.
- Harness groups — lay out enclosures and PCBs, and LoomFlow auto-detects isolated bundles into nameable harness groups, each with its own drawing sheet and grouped cut list for the bench.
- One portable file — connectors, layout, and device images all live in a
single
.loomflowfile on disk; optional cloud sync adds version history and read-only sharing.
Status
Browser demo is live and free for small designs; a Windows desktop app and paid cloud-sync tiers are in progress. The tool is developed in tight loops against real FSAE builds — cut lists come off LoomFlow and onto the bench, and clumsy workflows get fixed the same weekend they turn up at the track.