Our plugin SD Simulator vs STELLA

Comprehensive Feature Comparison for System Dynamics Modeling

Our plugin Advantages

Free and open source – no licensing fees
AI-powered model generation (unique feature)
WordPress integration – millions of potential sites
Web-native, works on any device
Modern, intuitive Loopy-style interface
Multiple AI providers (Claude, OpenAI, GLM, MiniMax)
Custom dashboard builder with widgets
No software installation required
Shortcode embedding anywhere
Fewer advanced simulation functions
No XMILE format support (yet)
No submodel/module support (yet)

STELLA Advantages

40+ years of development and refinement
Industry standard in academia and enterprise
Comprehensive function library
Multi-method modeling (SD, Agent-based, Discrete)
Advanced optimization and goal-seeking
XMILE format (industry standard)
Submodel and module support
Extensive documentation and tutorials
Professional support and training
Expensive ($1,999 – $3,999 per license)
No AI-powered model generation
Desktop-centric (web as add-on)

Pricing Comparison

Our plugin SD Simulator

FREE

Open source, self-hosted

Add your own AI API keys

No recurring fees

STELLA Designer

$1,999

Interface design only

Per license

STELLA Professional

$2,999

Full modeling + analysis

Per license

STELLA Architect

$3,999

Full features + multi-method

Per license

Simulation Engine Features

Feature	Our plugin	STELLA	Notes
Euler Integration	Yes	Yes	Basic numerical integration
Runge-Kutta 2 (RK2)	No	Yes	Second-order method
Runge-Kutta 4 (RK4)	Yes	Yes	High-precision integration
Adaptive Time Step	No	Yes	Auto-adjusts dt for stability
DELAY() Function	Yes	Yes	Material/information delays
DELAY1/SMOOTH()	Yes	Yes	First-order exponential delay
DELAY3()	Yes	Yes	Third-order cascaded delay
PULSE() Function	Yes	Yes	One-time or repeating impulse
STEP() Function	Yes	Yes	Step change at time
RAMP() Function	Yes	Yes	Linear ramp over time
Lookup Tables	Yes	Yes	Non-linear relationships
Random Functions	Yes	Yes	RANDOM(), NORMAL()
Array Variables	No	Yes	Multi-dimensional modeling
Unit Checking	No	Yes	Dimensional consistency
Conveyor Delays	No	Yes	Pipeline/conveyor modeling
Queues	No	Yes	FIFO/priority queuing
Agent-Based Modeling	No	Yes (Architect)	Individual agent simulation

Model Building Features

Feature	Our plugin	STELLA	Notes
Visual Drag-Drop Canvas	Yes	Yes	Both support visual modeling
Stock-Flow Diagrams	Yes	Yes	Core SD methodology
Causal Loop Diagrams	Yes	Yes	Relationship visualization
Submodels/Modules	No	Yes	Hierarchical organization
Model Sectors/Groups	No	Yes	Visual grouping
Ghost Variables	No	Yes	Duplicate display references
Auto-Layout	No	Yes	Automatic arrangement
Undo/Redo	Limited	Yes	Action history
Real-time Equation Validation	Yes	Yes	Syntax checking
Loopy-Style Aesthetics	Yes	No	Modern, approachable design
Glow Animation Effects	Yes	No	Visual feedback during simulation

Analysis & Optimization Tools

Feature	Our plugin	STELLA	Notes
Sensitivity Analysis	Yes	Yes	Parameter sweep analysis
Monte Carlo Simulation	No	Yes	Uncertainty quantification
Optimization/Goal-Seek	No	Yes	Find optimal parameters
Scenario Management	Yes	Yes	Save/compare scenarios
Parameter Sliders	Yes	Yes	Real-time adjustment
Batch Runs	No	Yes	Multiple automated runs
Equilibrium Analysis	No	Yes	Find steady states
Policy Analysis	No	Yes	Evaluate interventions

Visualization Features

Feature	Our plugin	STELLA	Notes
Time-Series Charts	Yes	Yes	Line graphs over time
Real-Time Animation	Yes	Yes	Live value updates
Comparative Graphs	Via Scenarios	Yes	Multiple run comparison
Phase Plots	No	Yes	Variable vs variable
Table Output	CSV Export	Yes	Tabular data display
Custom Dashboard Builder	Yes	Yes	Drag-drop widget interface
Gauge Widgets	Yes	Yes	Circular gauge displays
Slider Widgets	Yes	Yes	Interactive parameter controls
Storytelling Mode	No	Yes	Guided presentations

AI & Intelligent Features

Feature	Our plugin	STELLA	Notes
AI Model Generation	Unique	No	Create models from natural language
AI Model Modification	Unique	No	Adjust models via conversation
Multiple AI Providers	4 providers	No	Claude, OpenAI, GLM, MiniMax
Conversational Interface	Yes	No	Chat-based model building
AI Usage Limits by Role	Yes	No	Configurable per user role

Import/Export & Interoperability

Feature	Our plugin	STELLA	Notes
XMILE Format	No	Yes	Industry standard XML
Vensim Import	No	Yes	Import from Vensim
SD-JSON Format	Unique	No	Compatible with SD-AI project
CSV Export	Yes	Yes	Simulation results export
Excel Export	No	Yes	Native Excel format
Image/PDF Export	No	Yes	Diagram export
WordPress Shortcode Embed	Unique	No	Embed anywhere in WP

Platform & Deployment

Feature	Our plugin	STELLA	Notes
Web-Native	Yes	Stella Online	Browser-based experience
Desktop Application	No	Yes	Native desktop app
Self-Hosted	Yes	No	Your server, your data
WordPress Integration	Unique	No	Native WP plugin
Mobile Responsive	Yes	Limited	Works on all devices
No Installation Required	Yes	No	Access via browser
Offline Mode	No	Yes	Work without internet
Open Source	Yes	No	Full source code access

User Experience & Learning Curve

Aspect	Our plugin	STELLA
Learning Curve	Low – intuitive interface	Steep – professional tool
Target Audience	Educators, students, small businesses, consultants	Enterprises, academics, professional modelers
Design Philosophy	Accessible, AI-assisted, web-first	Feature-complete, professional-grade
Documentation	Growing	Extensive (40+ years)
Community	WordPress community	Large academic community
Support	Community/GitHub	Professional support

Pre-Built Templates

Template Type	Our plugin	STELLA
Population Growth	Yes	Yes
SIR Epidemic Model	Yes	Yes
Inventory Management	Yes	Yes
Predator-Prey (Lotka-Volterra)	Yes	Yes
Project Management	Yes	Yes
Savings/Finance	Yes	Yes
Resource Depletion	Yes	Yes
Workforce Dynamics	Yes	Yes
Total Templates	8	100+ (with examples)

When to Choose Each Tool

Choose Our plugin if you:

Want AI-powered model generation, need WordPress integration, are budget-conscious, prefer web-based tools, are teaching SD concepts, need to embed models in websites, or want an accessible entry point to System Dynamics modeling.

Choose STELLA if you:

Need enterprise-grade features, require multi-method modeling, need extensive function library, want industry-standard XMILE format, require professional support, need optimization capabilities, or are working on large-scale complex models.