Xcos

Overview

Xcos is a desktop graphical editor for constructing and simulating hybrid dynamical-system models. It suits engineers, researchers, and students working with mechanical, hydraulic, or control systems; its breadth of modeling tools is compelling, though Modelica work adds a setup requirement.

Models can be designed, loaded, saved, compiled, and simulated in both discrete and continuous time domains. That makes Xcos a focused environment for system modeling rather than a general-purpose simulation tool. Its offline access is useful for desktop workflows, but there is no lesson library for people who need built-in instruction.

Key features

Standard palettes and blocks give modelers a starting point, and user-defined palettes let them build reusable collections for their own work. Superblocks help organize and reuse model components, while configurable and conditionally executed subsystems support more involved model structures. These are practical strengths for users maintaining complex models, but they are less relevant to someone seeking a simple, guided introduction to simulation.

Signals can use any Scilab data type. Xcos also supports creating and customizing Modelica blocks, a useful extension for Modelica-oriented workflows, but those blocks require a C compiler. A C compiler is optional for general Scilab installation, so users who only need other Xcos capabilities can avoid that dependency.

The maker offers an FMI toolbox for Model-Exchange and Co-Simulation with Scilab and Xcos, as well as enterprise integration services. Professional services and support for Scilab are also offered.

Pricing

Xcos is free: its Free plan costs nothing and is distributed with Scilab. There are no paid plan tiers to weigh against the included modeling capabilities. This suits users who want a desktop modeling environment without a software charge; the trade-off is that advanced Modelica use still depends on a C compiler.

Platforms

Xcos is delivered as desktop software through the Scilab distribution for Windows, Linux, and Intel or ARM macOS. Offline access supports work without a web connection, but the desktop-only delivery will not suit readers who need a browser-based modeling environment.

Who it's for

Xcos is a sensible fit for industrial and academic users building models of mechanical systems, hydraulic circuits, or control systems. Its reusable superblocks, custom palettes, and configurable subsystems favor people with structured modeling workflows. It is a weaker fit for readers looking for guided lessons, a web app, or Modelica support without installing a C compiler.

Pros and cons

Pros

• Free access to the modeling environment: the Free plan is distributed with Scilab at no cost.
• Supports model organization and reuse: user-defined palettes and superblocks can help users build consistent libraries and simplify larger models.
• Wide system-modeling scope: it covers discrete and continuous time and use cases including mechanical, hydraulic, and control systems.
• Works offline across three desktop operating systems: Scilab provides the distribution for Windows, Linux, and Intel or ARM macOS.

Cons

• Modelica use needs a C compiler: this adds a dependency for users who want to create or customize Modelica blocks.
• Desktop delivery only: users seeking browser access will need another tool.
• No lesson library: learners looking for built-in instruction will need to find guidance elsewhere.

Alternatives

For a broader set of physics simulation software, compare tools by the systems and workflows they support. OpenFOAM is another free option for Linux, macOS, Windows, and self-hosted use; its support and code-customization services are separate and limited by hours. Choose it when those services and that deployment range better fit your needs.

OpenSim is free, open-source, and available for Linux, macOS, and Windows, with API access; downloading it requires a SimTK account. It is worth considering when that platform and account-based download suit your workflow. ngspice is a free circuit simulator for Linux, macOS, Windows, and self-hosted use, but it uses command-line or file-based input rather than schematic entry. It is the more direct alternative when circuit simulation is the priority and schematic drawing is not required.

SimFlow offers a free plan and a free trial across Linux, macOS, Windows, and web. GNU FisicaLab is free GPL-licensed software for Linux and Windows. FeenoX is free open-source software with API, Linux, self-hosted, and web availability, but has no graphical interface and targets GNU/Linux. Step is a free option for Linux. ASCEND is free open-source software for Linux, macOS, and Windows.

Verdict

Choose Xcos if you need a free desktop editor for designing and simulating hybrid dynamical-system models, particularly for industrial or academic work. Reusable model components, customizable palettes, and a broad system-modeling scope are its strongest reasons to choose it. Look elsewhere if you need browser delivery, built-in lessons, or Modelica capabilities without a C compiler requirement.