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What UnifCAD is
A browser-based simulator where the electrical schematic, the PLC program and the plant run as one live system.
UnifCAD runs entirely in the browser at app.unifcad.com. There is nothing to install.
A project is not a drawing — it is a working machine made of three modules that share the same signals:
| Module | What you do there |
|---|---|
| Schematic | Draw the control circuit: supplies, protections, contactors, push buttons, sensors, motors, PLCs. |
| Programming | Write the program each device runs. You choose its language when you create it: ladder logic (LD) or structured text (ST/SCL), with further IEC 61131-3 languages on the way. |
| Process | Model the plant in 3D — tanks, conveyors, valves — so the whole installation can be simulated, not just the cabinet. |
Press Simulate and all three run together: pressing a push button in the schematic energises a coil, the PLC scans its program, and the plant reacts.
Two modes, and only one of them lets you edit
UnifCAD is always in one of two modes:
- Design mode — you place, wire, move and configure components.
- Simulation — the circuit is live. You operate it, you do not edit it.
If a button looks disabled, check the mode first. The editor will tell you "Stop simulation first" when an action needs design mode.
Auto-save pauses during simulation
Your work is saved automatically while you design. During a simulation run the auto-save is deliberately switched off, so a test run never overwrites the drawing you saved before it.
Where your projects are stored
Projects are stored in your own browser, which is why they open instantly and work offline. That also means they live on that computer, in that browser.
- The Free plan keeps up to 5 local projects.
- Pro adds cloud saving, so the same project follows you to another machine, plus custom components and export.
Clearing site data deletes local projects
"Clear browsing data" for the site removes the local project store. If a project matters, save it to the cloud or export it before you clean up your browser.