Ladder Diagram Simulator
Quick answer: Draw ladder-style control diagrams online and analyze supported electrical models for contactors, relays, starters, and seal-in circuits. This is not a PLC scan-cycle emulator.
Best fit
Use this browser workflow when an editable drawing, structured electrical data, fast sharing, and common exports matter more than a native specialist desktop format.
Not the best fit
Use specialist software when the project requires native DWG intelligence, enterprise plant engineering, advanced production PCB/DFM, arbitrary vendor simulation models, certified power studies, or mechanical panel engineering.
Available capabilities
- Industrial control symbols
- DOL and star-delta starter templates
- Supported electrical model analysis
- Wire, terminal, PLC I/O, and BOM reports
Representative test
Open a relevant sample, change one component and connection, then verify the exact drawing, report, analysis, and export your job requires.
Other tools buyers evaluate
PLCLogix, LogixPro, CODESYS, Do-more Designer. Verify each vendor’s current primary documentation before purchase; this page does not claim feature parity.
Frequently asked questions
Can I draw ladder diagrams with this tool?
Yes. The Industrial symbol pack (160 symbols) includes contactors, overload relays, control relays, push buttons, limit switches, timers, and motor starters — everything needed to draw ladder-style control diagrams. Pre-built templates cover DOL and star-delta starters and three-wire start-stop seal-in circuits.
Does it simulate ladder logic like a PLC?
It simulates the electrical circuit behind the ladder diagram — the browser circuit-analysis engine solves the actual voltages and currents in your control circuit. For rung-by-rung PLC ladder-logic execution with virtual I/O, our companion tool at plcsimulationsoftware.com runs ladder programs with virtual I/O in the browser.
Is the ladder diagram tool free?
Yes. You can draw and export ladder-style control diagrams free on the starter plan with no signup to begin. Paid plans unlock unlimited diagrams, the full Industrial symbol pack, and additional supported-model analyses.
What ladder diagram examples are included?
The template library and diagram library include DOL motor starters, star-delta starters, reverse-forward starters, start-stop seal-in circuits, and dozens of published ladder-logic reference diagrams you can open, edit, and export.
Can I export ladder diagrams for documentation?
Yes. Export as high-resolution PNG, scalable SVG, or print-ready PDF with multi-page title-block support, plus a Bill of Materials CSV listing every contactor, relay, and device in the drawing.