Nirai
Watch your system dynamics model flow, not just chart
What it does
Most system dynamics tools show results as line charts — you read the numbers. Nirai animates the same stock-and-flow model as real water flowing through tanks and pipes, so feedback loops and bottlenecks are something you watch, not decode. Export the whole simulation as MP4 for slides, decks, or explainers — no other SD tool does this. Runs fully in-browser: Rust/WASM engine, RK4 solver, formula engine with lookups + randoms. AI edits your model on-canvas using your own API key.
Does the same job
all alternatives →- ISI simulated closing the Strait of Hormuz on real oil trade dataJul 2026 · globaloilnetwork.staffinganalytics.io · ▲244
OP here: I created this visualization tool as the byproduct of a supply chain class I taught at Columbia. The pedagogical exercise grew into a full blown visualization and paper about global oil trade. The model: The mechanics are the same as the financial network Eisenberg-Noe: Instead of banks, every country consumes oil interconnected via bilateral trading. Shocks propagate throughout the network, depleting oil reserves when bottleneck nodes (such as the Strait of Hormuz) are blocked. Insights: The interesting part is the mechanics of how the crisis unfolds: for example, France receives 0…
- CDCreate diagrams of complex data flows in software systems2024 · github.com · ▲205
Hello HN, It has been a while since I contributed to the web, so I decided to get back in shape and publish "something". This app is a POC of "what if diagrams were more dynamic". I'm a software engineer by trade, and with conventional tools, I often times struggle to explain flows of data in complex software systems. I got inspired by video games like The Incredible Machine and Factorio, as in some ways, software systems tend to become Rube Goldberg-esque machines ;) As a side quest, I also wanted to craft diagrams faster than text-based tools (ex: mermaid), as I am always forgetting their…
- AN
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