Python framework for building and simulating dynamical systems using block diagrams
Stage
Established
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Founded
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Based in
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Pricing model
Freemium
Open source
Pricing
Community plan is free and open-source under MIT License. Growth plan starts at $45/month with 3 seats included. Enterprise plan available upon contact with custom pricing.
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Key features
Content Type Builder
REST and GraphQL APIs
Media Library
Role-Based Access Control
Content History
Webhooks
Internationalization
Audit Logs
Custom Fields
Releases
30+ solvers including implicit, explicit, and adaptive integrators
Zero-crossing detection and scheduled events for hybrid systems
Hot-swappable blocks and solvers during active simulation
Hierarchical subsystems for modular component design
MIMO support with multiple input and output ports
Browser-based visual editor with PathView
Domain toolboxes for chemical, battery, vehicle, flight, and RF engineering
Custom blocks through subclassing the base Block class
Supports continuous-time, discrete-time, and hybrid systems
FMI integration to wrap Co-Simulation and Model-Exchange FMUs
What makes it different
MIT-licensed and fully open-source code you control
Built as a Node.js framework with full customization capability
Flexible deployment options including self-hosting and managed cloud
Generates REST and GraphQL APIs from content models in minutes
Enterprise-ready with SOC 2 certification and GDPR compliance
Readable, scriptable alternative to traditional simulation tools with solver depth
Full ecosystem including FastSim Rust engine and standalone C code generation
Minimal runtime dependencies: only numpy, scipy, and matplotlib
Domain-specific toolboxes for chemical, battery, vehicle, flight, and RF engineering