Free browser-based developer tools for everyday tasks
Python framework for building and simulating dynamical systems using block diagrams
Stage
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Founded
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Based in
BD
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Pricing model
Freemium
Open source
Pricing
Free plan available. Starter: $4.99/mo (1 GB cloud storage, up to 50 MB file processing, 1 team seat). Pro: $19.99/mo (10 GB cloud storage, up to 500 MB file processing, 3 team seats). Max: $49.99/mo (50 GB cloud storage, up to 5 GB file processing, 10 team seats). Yearly plans available at 20% disc
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Key features
440 tools across 14 categories
Local browser processing for core tools
JSON formatting and Base64 encoding
QR code generation
Word counting and text analysis
Image processing and resizing
Cloud storage for paid plans
Team collaboration features
API access for Pro and Max plans
No ads or sponsor strip for paid users
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
Most tools run locally in browser without requiring an account
Fast results with instant processing as you type
Clean, intuitive interface without friction
Completely free tools available with no signup required
Large collection of 440 specialized tools in one place
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
Toolblip