Schemo
A browser-based electrical and HVAC schematic editor — drag-and-drop IEC symbols, smart wiring, and QR-accessible live panel diagrams, all without installing anything.
Electrical diagrams trapped in desktop software.
Creating electrical and HVAC schematics has always meant expensive desktop CAD licences, locked to a single machine. Field technicians can't access or update diagrams on-site, engineers waste time with clunky tools that haven't changed in decades, and sharing a drawing means exporting PDFs and emailing files back and forth. There's no way to scan a panel and pull up its live diagram instantly.
A full schematic editor, in the browser.
We built Schemo as a professional-grade schematic editor that runs entirely in the browser. It features a full canvas engine with drag-and-drop components from a library of over 100 IEC 60617 symbols — covering electronics, electrical distribution, HVAC, PLC/BMS, and network devices. Every symbol carries metadata: model numbers, serial numbers, voltage ratings, and specs.
The wiring system supports both direct and Manhattan routing with automatic connection-point snapping. Components get auto-assigned reference designators (R1, C1, TB1) based on type. Layer management, undo/redo history, copy/paste, a command palette, and full keyboard shortcuts make it feel like a native application — except it opens in a tab. QR codes on physical panels link directly to their live diagrams.
From panel to diagram, instantly.
Schemo replaces the need for heavyweight desktop CAD tools with a fast, accessible browser application. Engineers create and edit schematics from anywhere, technicians scan QR codes on panels to pull up live diagrams in the field, and the entire workflow — from drawing to documentation — happens in one place with zero installs.