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opensource
AnimatedLLM explains how large language models work through a web application.
About opensource
AnimatedLLM is an open-source educational web application that explains how large language models work. Rather than static diagrams or equations, it presents dynamic, step-by-step visualizations of the Transformer architecture in action, and it runs entirely in the browser using pre-computed data. The project is published on GitHub under an MIT license, with source built using D3.js and GSAP.
Key features
- Step-by-step animated visualizations of the Transformer architecture
- Keyboard controls to play, pause, step, reset and skip tokens
- Runs entirely in the browser using pre-computed data
- Light and dark theme toggle plus language switching
- Source code on GitHub under an MIT license
- Can be run locally with Node.js 20.9.0+ and npm
Best for: Students, teachers and researchers who want an interactive visual walkthrough of how Transformer-based language models process text.
Good for
- Open source under an MIT license, with contributions welcomed
- Runs in the browser using pre-computed data, so no local model setup is needed to view it
- Documented citation for use in research or teaching
Watch out for
- Running the app on your own device requires Node.js version 20.9.0 or higher and npm
- The animation relies on pre-computed data rather than live model execution
opensource at a glance
- Category
- AI & Machine Learning › AI Learning & Guides
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
opensource alternatives
Tools and sites you could use instead, ranked by how closely they match.
AnimatedLLM uses animations to explain the mechanisms behind large language models.
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opensource FAQ
What is AnimatedLLM?
An educational web application designed to teach how large language models work, using dynamic step-by-step visualizations of the Transformer architecture.
What is needed to run it locally?
Node.js version 20.9.0 or higher and npm; install dependencies with npm install and start the development server with npm run dev.
How should AnimatedLLM be cited?
The repository provides a citation for the paper "AnimatedLLM: Explaining LLMs with Interactive Visualizations" by Zdeněk Kasner and Ondřej Dušek, 2025, arXiv 2601.04213.
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