No longer in active development.
This simulator stays free and online, but I am not adding to it any more. All the work goes into studio.rungs.dev — same idea, free in the browser, with a wider instruction set, Structured Text, and an AI assistant.
About
PLC Simulator Online brings the power of Programmable Logic Controller (PLC) coding to your fingertips. Our platform provides a unique, interactive experience, bridging the gap between theory and practice.
The simulator lets you code, simulate, and share Ladder Logic diagrams directly in your browser — no hardware, no setup. It started in 2020 as a learning tool and has grown into one of the most-used free PLC simulators on the web.
A Growing Community
PLC Simulator Online is used by 250,000+ students, hobbyists, and engineers every year, across 190+ countries. Together they have created and shared more than 95,000 saved projects.
Open-Source
In August 2024, PLC Simulator Online was released as an open-source project, inviting developers worldwide to contribute. Read the announcement (opens in a new tab) or visit the GitHub repository (opens in a new tab).
What's Next: Rungs
The next chapter for learning PLC programming is rungs.dev (opens in a new tab) — a modern browser-based simulator with Ladder Logic, Structured Text, an AI assistant, and a full tag database. Built for the next generation of PLC engineers.