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Vensim VS Nirai.app

Compare Vensim VS Nirai.app and see what are their differences

Vensim

Ventana Systems' Vensim software creates in-depth analytical data for clients with a special focus on the energy, environment and infrastructure sectors... read more.

Rating
0 reviews
Alternatives Is it good?
Nirai.app

Create interactive system dynamics and stock-and-flow models online. Visualize water flowing through tanks and pipes, run simulations, export MP4 animations.

Rating
0 reviews
Pricing
Freemium Free trial
Alternatives Is it good?
HIVLY.APP
Give Hivly an idea. Get a finished social post. Add a photo and one sentence. Hivly writes the caption, designs the post, and schedules it for Facebook, Instagram, and LinkedIn. sponsored

Which is more popular?

Simulation Modeling popularity
71% vs 29%
alternatives listed
25 vs 4

Base details

Website, pricing, platforms and company facts side by side.

Vensim
Nirai.app
Website ventanasystems.com nirai.app
Pricing —
Freemium Free trial Official pricing
Platforms —
Web
Listed in
Technical Computing Simulation Modeling Numerical Computation Data Visualization +1
Systems Data Visualization Social Media Tools Simulation Modeling +1

About Vensim and Nirai.app

In their own words, as submitted to SaaSHub.

Vensim
Nirai.app

No description of Vensim yet.

Nirai is a browser-based system dynamics and stock-and-flow simulator. Unlike traditional tools that show results as line charts, Nirai animates the same model as real water flowing through tanks and pipes — so feedback loops and bottlenecks are something you watch, not decode. Built on a...

Read more about Nirai.app

Features and specs

What each product offers, as listed by its team.

Vensim 0 features
Nirai.app 7 features

No features have been listed yet.

  • Stock-and-flow modelling
    Build system dynamics models visually with stocks, flows, auxiliaries, and connectors
  • Interactive visualisation
    Simulation renders as real water flowing through tanks and pipes in real time — not line charts
  • AI tutor
    AI assistant proposes and edits stocks and flows directly on your canvas using your own API key
  • MP4 export
    Export the full animated simulation as an MP4 video for slides, decks, or lectures
  • XMILE import
    Import existing models from Vensim or Stella Architect via the XMILE standard
  • Client-side execution
    Rust/WASM engine runs fully in-browser — no server, no install, instant slider feedback
  • Bring your own API key
    Supports OpenAI, Gemini, and OpenRouter — your key stays local, never stored on Nirai servers

Analysis

An editorial look at what each product does well and who it suits.

Vensim
Nirai.app

Overall verdict

  • Vensim is a mature, well-regarded system dynamics modeling tool that offers powerful simulation, optimization, and sensitivity analysis capabilities, making it a strong choice for building and analyzing dynamic feedback models.

Why this product is good

  • Robust support for system dynamics modeling with stocks, flows, and feedback loops
  • Powerful analysis features including Monte Carlo sensitivity analysis, optimization, and calibration
  • Free PLE (Personal Learning Edition) available for students and educational use, lowering the barrier to entry
  • Long-established, stable software with a proven track record in academia and industry
  • Good documentation, tutorials, and an active user community
  • Handles complex, large-scale models efficiently

Recommended for

  • Academics and researchers studying system dynamics
  • Students learning modeling and simulation (via the free PLE)
  • Business analysts building strategic and policy models
  • Engineers and scientists needing dynamic feedback simulations
  • Public policy and epidemiological modelers
  • Organizations requiring rigorous sensitivity and optimization analysis

No analysis of Nirai.app yet.

Videos

Walkthroughs and reviews on video.

Vensim 3 videos + Add
Nirai.app 1 video + Add

System Dynamics dengan Vensim [beserta contoh model dan simulasi]

More videos

  • - VENSIM - Basics Tutorial (Simple)
  • - SOS212: Units in Vensim - Unit Synonyms and Checking Units

Getting started

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
Vensim
Nirai.app
71% 71%
Simulation Modeling
29% 29%
0% 0%
Systems
100% 100%
69% 69%
Data Visualization
31% 31%
0% 0%
Social Media Tools
100% 100%

Questions & Answers

As answered by people managing Vensim and Nirai.app.

What makes your product unique?

Nirai.app's answer:

Nirai is the only system dynamics simulator that animates your model as real water flowing through tanks and pipes — instead of plotting results as line charts. This makes feedback loops, bottlenecks, and oscillations immediately visible without decoding numbers. It runs entirely in the browser via a Rust/WASM engine with no install required, exports simulations as MP4 videos, imports XMILE files from Vensim and Stella, and includes an AI tutor that edits your model directly on the canvas using your own API key. Nothing is processed on Nirai's servers

Which are the primary technologies used for building your product?

Nirai.app's answer:

Nirai is built with Rust compiled to WebAssembly (WASM) for the simulation engine, using RK4 numerical integration and the fasteval2 formula engine for lookup tables, trigonometric functions, and stochastic expressions. The frontend is Vue 3 with Tailwind CSS, compiled with Vite and pre-rendered as static pages via Vite SSG. The AI assistant integrates with OpenAI, Google Gemini, and OpenRouter via the user's own API key. The app is hosted on Netlify and functions as a Progressive Web App with offline support.

Why should a person choose your product over its competitors?

Nirai.app's answer:

Vensim and Stella Architect require desktop installation, cost hundreds of dollars per year, and show results only as line charts. InsightMaker is browser-based but has no animation, no MP4 export, and no AI assistance. Nirai combines all the things competitors lack: runs in the browser for free, animates the simulation visually, exports MP4 for presentations, imports existing XMILE models so you don't start from scratch, and includes an AI tutor that works on your canvas. Pro is a one-time $99 — not a recurring subscription.

How would you describe the primary audience of your product?

Nirai.app's answer:

Nirai is built for three groups. Educators and students who teach or learn system dynamics and need a free, browser-based tool that requires no installation and produces shareable, visual results. Analysts and consultants who need to communicate system behaviour to non-technical clients and want to export animated simulations into slides or decks. Engineers and researchers who already use Vensim or Stella and want a faster, browser-native tool that can import their existing XMILE models.

What's the story behind your product?

Nirai.app's answer:

Nirai was built by a solo developer who was frustrated that every system dynamics tool — Vensim, Stella, InsightMaker — shows simulation results as line charts you have to read and interpret. The idea was simple: what if the simulation looked like the thing it was modelling? A supply chain model where you can actually watch inventory surge and lag. An epidemic model where you watch people move between compartments. That visual clarity became the core of Nirai. The simulation engine was built in Rust compiled to WebAssembly so it runs at native speed entirely in the browser, with no server round-trips and no install barrier

Who are some of the biggest customers of your product?

Nirai.app's answer:

Nirai launched in 2026 and is in its early stage. Current users include system dynamics educators, independent analysts, and engineers exploring browser-based alternatives to Vensim and Stella. If you are using Nirai in a classroom or professional context, we'd love to hear from you at admin@nirai.app.

User comments

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