PLC-LadderLooking for a LogixPro alternative? Five free options for practicing ladder logic in 2026 — browser simulators, open source and vendor tools — compared fairly.
LogixPro earned its place: for two decades of PLC courses, its RSLogix-style editor and animated exercises — the silo, the traffic light, the batch mixer — were how students practiced ladder logic without a hardware trainer. But people search for a LogixPro alternative for consistent reasons: it's paid (modest, but real for a student), Windows-only in an era of Chromebooks and Macs, styled on the older RSLogix 500 world, and locked to its built-in exercises. Here are five free alternatives in 2026, matched honestly to what you're actually trying to replace — including the cases where paying for LogixPro remains the right call.
What You're Replacing (Be Specific)
LogixPro bundles three things: an editor that feels like Allen-Bradley, a simulator that runs your rungs, and canned exercises with animated machinery. No single free tool replaces all three identically, so pick by which one you need most.
1. PLC-Ladder (browser, free plan — that's us)
PLC-Ladder replaces the editor and simulator outright: ladder (plus FBD and structured text) in any browser, no install, compiler-checked logic, live animation, and OPC UA exposure for driving your practice logic from a real HMI — something LogixPro never did. It speaks IEC rather than the Rockwell dialect, so pair it with our XIC/XIO/OTE translation guide if your course is Allen-Bradley-flavored. For the canned-exercise gap, the ten practice projects replicate the classic LogixPro assignments (traffic light, batch, conveyor) as specs. Best for: anyone on a Mac/Chromebook, anyone starting today, anyone who wants all three IEC languages.
2. OpenPLC (open source)
Free and GPL-licensed, all five IEC languages, runs on Windows/Mac/Linux and — its party trick — on real cheap hardware (Raspberry Pi, ESP32), so practice can graduate to physical I/O for the price of a pizza. Rougher edges than commercial tools and some assembly required. Best for: tinkerers who want their alternative to eventually blink real LEDs.
3. Connected Components Workbench (Rockwell, free)
If what you liked about LogixPro was Rockwell-ness, the closest free source is Rockwell themselves: CCW is a free download with ladder, FBD and ST and a simulation mode. The honest catch: it targets the Micro800 line, whose dialect differs in places from the RSLogix 500/5000 world LogixPro imitates — closer than anything else free, still not identical. Windows-only, heavyweight install. Best for: students specifically headed into Allen-Bradley plants.
4. Do-more Designer (AutomationDirect, free)
A full professional IDE with a genuinely good built-in simulator, free with no time limit. Its instruction set is AutomationDirect's own dialect — a fine place to learn ladder thinking, with the same transfer caveat as any vendor tool. Windows-only. Best for: a free, stable, installable Windows simulator with commercial depth.
5. PLC Fiddle (browser, free)
The minimalist option: ladder only, simplified instructions, instant. It replaces LogixPro the way a notepad replaces a workbook — fine for sketching one rung idea, outgrown within weeks of serious study. Best for: absolute-first-contact simplicity.
Quick Comparison
| Cost | Platform | Languages | Feels like AB? | Exercises included? | |
|---|---|---|---|---|---|
| PLC-Ladder | Free plan | Any browser | LD, FBD, ST | IEC (guide provided) | Project specs on the blog |
| OpenPLC | Free | Win/Mac/Linux + boards | All five | No | No |
| CCW | Free | Windows | LD, FBD, ST | Closest free | No |
| Do-more Designer | Free | Windows | LD (dialect) | No | Some samples |
| PLC Fiddle | Free | Any browser | LD only | No | No |
| LogixPro (reference) | Paid | Windows | LD (RSLogix-style) | Yes (500-era) | Yes, animated |
When LogixPro Is Still the Right Answer
Fairness cuts both ways: if your course assigns LogixPro exercises and grades against them, buy it — fighting your syllabus costs more than the license. Its animated process simulations (watching the silo actually fill) remain pedagogically lovely, and no free tool replicates them exactly. For everyone else — self-learners, Mac/Chromebook students, anyone who wants modern IEC languages or to test logic against a real SCADA client — the free stack above covers the ground, and the best first step is the one with zero friction: open the browser simulator, build the seal-in from Ladder Logic for Beginners, and be running rungs before a download would have finished.