OpenSim vs Xcos

OpenSim8.4Visit Xcos8.2Visit

Higher score OpenSim #5 in Physics Simulation Software 8.4/10 Free plan Free plan✓ 4 of 6 features Visit OpenSim

vs

Xcos #7 in Physics Simulation Software 8.2/10 Free plan Free plan✓ 2 of 6 features Visit Xcos

• OpenSim fits best

  Free musculoskeletal simulation

• Xcos fits best

  Free engineering system modeling

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Side by side

Feature	OpenSim 8.4/10 Visit ↗	Xcos 8.2/10 Visit ↗
At a glance
Editor score	8.4	8.2
Ranking	#5 in Physics Simulation Software	#7 in Physics Simulation Software
Best for	Free musculoskeletal simulation	Free engineering system modeling
Pricing model	Free	Free
Starting price	Free plan	Free
Free plan	✓	✓
Free trial	—	—
Deployment	Desktop	Desktop
Platforms	Windows, macOS, Linux	Windows, macOS, Linux
Support	Community, Docs	Email, Community, Docs
Built for	Small business, Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features OpenSim 4/6 · Xcos 2/6
Lesson library	✓ (best)	—
Authoring tools	✓	✓
Assessment tools	Not checked yet	Not checked yet
3D visuals	✓ (best)	Not checked yet
Offline access	Not checked yet	✓ (best)
Data export	✓ (best)	Not checked yet
Specs
Delivery mode	Desktop	Desktop
Our review
Pros	Inverse kinematics, inverse dynamics, and muscle-control workflows Moco supports direct-collocation optimal control Python, Java, C++, and MATLAB interfaces plus export tools	Free, open-source desktop software distributed with Scilab Supports continuous, discrete, symbolic-equation, and hybrid simulation Custom blocks, Modelica modeling, and Scilab post-processing
Cons	Focused on musculoskeletal modeling rather than general physics simulation Desktop delivery may not fit browser-first workflows No AI features are provided	Desktop delivery may not suit browser-first teams Requires working within the Scilab ecosystem No lesson library for guided learning
Our verdict	OpenSim is open-source software for developing musculoskeletal models and creating dynamic movement simulations. It is aimed at biomechanics, rehabilitation, orthopaedics, performance, and movement-science researchers, as well as teams… Read the review →	Xcos is a graphical editor and simulator for designing, loading, saving, compiling, and simulating hybrid dynamical-system models. It is distributed with the free, open-source Scilab software and is suited to engineering, science,… Read the review →

Strengths and trade-offs

• OpenSim — where it wins

  • Inverse kinematics, inverse dynamics, and muscle-control workflows
  • Moco supports direct-collocation optimal control
  • Python, Java, C++, and MATLAB interfaces plus export tools

  Where it doesn't

  • Focused on musculoskeletal modeling rather than general physics simulation
  • Desktop delivery may not fit browser-first workflows
  • No AI features are provided

• Xcos — where it wins

  • Free, open-source desktop software distributed with Scilab
  • Supports continuous, discrete, symbolic-equation, and hybrid simulation
  • Custom blocks, Modelica modeling, and Scilab post-processing

  Where it doesn't

  • Desktop delivery may not suit browser-first teams
  • Requires working within the Scilab ecosystem
  • No lesson library for guided learning

• OpenSim8.4/10 · Free plan

  A free, research-focused toolkit for detailed musculoskeletal simulation and analysis.

  Visit OpenSimFull verdict →
• Xcos8.2/10 · Free plan

  Free, open-source system modeling across continuous, discrete, hybrid, and Modelica workflows.

  Visit XcosFull verdict →