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Nirai
$19Starting price
1.6KMonthly visits
4Popularity
About Nirai
Nirai is a browser-based system dynamics simulator that represents stocks and flows as animated water moving through tanks and pipes. Models are built on an auto-layout canvas where nodes are positioned automatically, and users can extend systems by right-clicking existing elements or describing structure in plain language. The tool includes a formula engine supporting trigonometric functions, lookup tables, and random functions for stochastic behavior, alongside a Rust-based RK4 solver that runs entirely in the browser for instant feedback. Users can adjust parameters via sliders and observe real-time changes without server round-trips. Simulations can be exported as shareable MP4 videos with or without watermarks, and existing models from Vensim or Stella can be imported in XMILE or STMX format. The platform also offers an AI assistant that proposes model changes using a user’s own API key, with changes rendered directly onto the canvas rather than provided as text explanations.
Key features
- Real-time water-based animation of stocks and flows
- Auto-layout canvas with automatic node positioning
- RK4 solver running in-browser for instant feedback
- Formula engine with trig functions, lookup tables, and random functions
- AI assistant for model structure and formula suggestions
- MP4 export with or without watermark
- Import of XMILE and STMX models from Vensim/Stella
- Interactive parameter sliders for live simulation adjustments
Use cases
- Teaching system dynamics concepts with visual feedback
- Creating client presentations with animated simulations
- Prototyping supply chain or ecosystem models
Pros
- Real-time fluid animation of system dynamics
- Auto-layout canvas with no manual node dragging
- MP4 export for presentations and sharing
- Supports import of Vensim and Stella models
- AI assistant that modifies models directly on canvas
Cons
- Free tier limited to 1,000 time steps
- Pro features require a one-time $99 payment
- No offline desktop application available
- AI generation requires user-provided API key
Frequently asked questions about Nirai
What is Nirai and what does it do?
Nirai is a browser-based system dynamics simulator that visualizes stocks and flows as animated water moving through tanks and pipes. It allows users to build, simulate, and share interactive models entirely in the browser without requiring desktop software or license fees.
Who is Nirai designed for?
Nirai is designed for educators, researchers, consultants, and business analysts who need to model complex systems such as supply chains, ecosystems, or business growth. Its intuitive interface and real-time visual feedback make it accessible to users without advanced technical skills.
Can I import models from other system dynamics tools?
Yes, Nirai supports importing existing models from Vensim or Stella in XMILE or STMX format. The model structure transfers instantly, though formulas using unsupported functions or subscripts may require adjustments.
Does Nirai offer AI assistance for modeling?
Yes, Nirai includes an AI assistant that can suggest model changes, such as adding stocks, flows, or formulas, based on user prompts. Users can bring their own API key (e.g., from Gemini, OpenAI, or OpenRouter) to enable this feature.
How do I export my simulations?
Simulations can be exported as shareable MP4 videos with or without watermarks. The export includes the full animated flow, making it suitable for presentations, lectures, or client decks.
What are the limitations of the free tier?
The free tier allows users to build and simulate models with up to 1,000 time steps. For unlimited simulations and advanced features, a paid plan is available.
Nirai Website Engagement
Last Update: 9 days ago
Total Monthly Visits
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Bounce Rate
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Visit Duration (avg)
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Pages Per Visit
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Country Rank
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India
Global Rank
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