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Konium Designer: free PCB design for engineers who work in Altium Designer

        
Konium Designer is free schematic capture and PCB layout software in the same environment as Altium Designer, with the menus, panels, dialogs and shortcut keys you already know. It opens, edits and saves real Altium projects, schematics, boards and libraries, in your browser or installed on your computer, and works offline. Your files stay on your computer.

        
Work with Altium files without Altium Designer

        
Open, edit and save projects (.PrjPcb), schematics (.SchDoc), PCBs (.PcbDoc), schematic and PCB libraries (.SchLib, .PcbLib), database libraries (.DbLib, their database read in the browser), Output Jobs (.OutJob) and Draftsman documents (.PCBDwf); read integrated libraries (.IntLib). Drop a project folder or files on the window and they open as Altium Designer shows them; save them back in the same formats.

        
What you can do

        
    
          
  • Schematic capture: parts, wires, buses, net labels, ports, sheet symbols and harnesses; annotation; compile and electrical rules check.
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  • PCB layout: interactive routing that walks round or pushes obstacles, differential pairs, length tuning, polygon pours, rooms, unions, design rules and DRC.
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  • Libraries: schematic symbols and PCB footprints, the Component Wizard, library reports.
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  • AI Component Builder: PCB footprints and schematic symbols from a datasheet PDF — its variants surveyed, the land pattern read, measured on the drawing itself and checked against it, the pin table laid out as a symbol and checked against the footprint, then added to your libraries (the free Konium service, your own AI key or a model on your computer).
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  • AI Design Adviser: the schematic and the board reviewed before they are made — supplies, decoupling, buses wired the wrong way, layout measured — each part checked against its own datasheet.
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  • Signal Integrity: every net screened for overshoot, undershoot, flight time and slope, terminations suggested and tried, reflections and crosstalk drawn as waveforms; Signal Integrity rules checked by DRC.
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  • Draftsman documents (.PCBDwf): fabrication and assembly drawings — board views, drill, layer stack and BOM tables, title blocks — opened, edited, printed and saved.
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  • Multi-board design: multi-board projects, their schematic of modules and connections (every pin the boards share, checked) and their assembly in 3D.
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  • Harness design: harness projects, their wiring diagrams and layout drawings, and the wire list with each wire's ends, cable and length along the bundles.
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  • Diagrams: block diagrams, flowcharts and circuit sketches beside your design, with shape libraries (circuit symbols among them), connectors, layers and formatted labels; blocks linked to the project's schematic sheets; .drawio and Visio (.vsdx) files opened, and diagrams exported as them, as PNG and SVG, or as PDF through the print dialog.
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  • Enclosure designer: a box for the board made to be 3D printed: base and lid or two shells, press fit, snap catches or screws, standoffs, openings found for the parts at the board's edge and for its LEDs, switches and displays; your own holes, cut-outs, slots, pockets, vents, bosses, pins, ribs, text and logos placed by clicking a face, in 3D or in a face view with a grid and snapping; colours and finishes, text in a second colour; checked for printing, exported as STL, 3MF or STEP, and saved as pictures to show.
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  • Requirements: a project's requirements in requirements documents, under sections, each with its identifier, priority, status, source and verification; linked to parts, nets, sheets or the board and followed back to the design; checks against the design (copper layers, board size and thickness, the tallest parts, parts, BOM lines, cost per board, operating temperature, narrowest track, smallest hole, design rules, compile errors, enclosure size) that verify them as you work; formatted text (lists, tables, links, pictures pasted from Word or dropped in) and attached files, kept in the document; import from Excel or CSV and export to them; a compliance report; a specification (text, Markdown, Word or PDF) split into requirements by AI.
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  • ActiveRoute: the selected connections routed in one go on the layers you choose, with no vias, optionally along a route guide you draw; pins can be swapped within their swap groups first where that shortens them.
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  • BOM handling: ActiveBOM documents in which a line can be given part choices, by hand or from parts searched for in a public copy of JLCPCB's parts list or at Digi-Key and Mouser, with stock and price breaks where given; the cost for a production quantity, BOM checks, JLCPCB's assembly BOM, and part numbers suggested by AI and looked up in JLCPCB's parts list.
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  • Update the PCB from the schematic and the schematic from the PCB.
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  • Outputs: Gerber and NC drill files, pick and place, bill of materials, Smart PDF, a 3D view with STEP models, STEP and STL export.
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  • Circuit simulation: SPICE in the browser — operating point, transient, DC sweep, AC and transfer function analyses of the schematic, waveforms in SimView.
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  • Other tools: import KiCad, PADS, EasyEDA, OrCAD Capture, Allegro, EAGLE and IPC-2581 designs as Altium projects; export a project to KiCad, PADS, EasyEDA, OrCAD, Allegro or EAGLE.
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Free, offline, private

        
No account, no adverts, nothing to install unless you want to: install it from the browser or download it as a single HTML file and it runs without a connection. Offline mode stops every connection, and has the browser itself refuse them; About lists each connection Konium Designer can make. Konium Designer is supported by donations.

        
Questions

        
Can I open Altium Designer files without Altium Designer?

        
Yes. Konium Designer opens .PrjPcb, .SchDoc, .PcbDoc, .SchLib and .PcbLib files and saves them back as Altium files; it reads integrated libraries (.IntLib) too.

        
Can it import designs from KiCad, PADS, EasyEDA, OrCAD, Allegro or EAGLE?

        
Yes. File › Import Wizard brings KiCad projects and libraries, PADS ASCII files, EasyEDA projects, OrCAD Capture designs and libraries, Allegro boards, EAGLE designs and libraries and IPC-2581 boards in as Altium projects, and File › Export Wizard writes a project as KiCad, PADS, EasyEDA or EAGLE files, or for OrCAD and Allegro.

        
Will it feel familiar?

        
That is what it is built for: the same environment as Altium Designer, so you feel at home.

        
Which browsers?

        
Chrome and Edge, on Windows, macOS and Linux, with whole project folders. Other browsers open files one by one.

        
Altium Designer is a trademark of Altium Ltd. Konium Designer is independent and not affiliated with it.

        
Opened the source file? It only runs through the dev server: run npm install then npm run dev, or open the built dist/index.html.