What is WebLLM Chat used for?

WebLLM Chat is a private AI chat that runs large language models entirely in your browser using WebGPU, with no server and optional offline use. It is a good fit for chatting with an AI model without sending data to the cloud and experimenting with local models in a browser.

Is WebLLM Chat open source?

Yes. WebLLM Chat is open source under the Apache-2.0 licence. Its source code is on GitHub at mlc-ai/web-llm-chat and is written mainly in TypeScript.

Yes. WebLLM Chat is open source, so the software itself is free to use. A managed cloud version is also available.

Can I self-host WebLLM Chat?

Yes. WebLLM Chat can be self-hosted on your own server or infrastructure.

What is WebLLM Chat an alternative to?

WebLLM Chat is an open-source alternative to ChatGPT and Claude. Other open-source alternatives to ChatGPT include GPT4All, Jan and Zola Chat.

Is WebLLM Chat actively maintained?

The most recent commit to WebLLM Chat was on 18 February 2026. The project has 1.1k stars on GitHub.

WebLLM Chat: open-source alternative to ChatGPT, Claude

About WebLLM Chat

WebLLM Chat is a chat interface that runs large language models locally in the browser through WebGPU acceleration. Because inference happens on your own hardware, conversations never leave your computer, and no server-side processing or cloud service is needed. It combines the WebLLM engine with the user interface of NextChat and is part of the MLC.ai family of projects. It is aimed at people who want private AI chat without handing data to a provider.

After the initial model download, it can run fully offline. It supports vision models, so you can upload images and ask questions about them, and offers markdown rendering, dark mode and a responsive layout. You can also connect to custom models in your local environment through MLC-LLM, and the open-source framework can be customized to build your own AI applications.

A hosted copy of the app is available at chat.webllm.ai, and the code is written in TypeScript with Next.js under Apache-2.0. Performance depends on your device's GPU and browser WebGPU support, so check compatibility before relying on it.

Key features

Runs LLMs in the browser with WebGPU
Conversations stay on your device
Works offline after model download
Vision model image uploads
Custom models through MLC-LLM
Markdown support and dark mode

Good fit for

→Chatting with an AI model without sending data to the cloud
→Experimenting with local models in a browser

Built with: TypeScript; Next.js
Tags: webllm; webgpu; local-ai; ai-chat; privacy; llm; offline; nextjs

WebLLM Chat: questions and answers

What is WebLLM Chat used for?: WebLLM Chat is a private AI chat that runs large language models entirely in your browser using WebGPU, with no server and optional offline use. It is a good fit for chatting with an AI model without sending data to the cloud and experimenting with local models in a browser.
Is WebLLM Chat open source?: Yes. WebLLM Chat is open source under the Apache-2.0 licence. Its source code is on GitHub at mlc-ai/web-llm-chat and is written mainly in TypeScript.
Is WebLLM Chat free?: Yes. WebLLM Chat is open source, so the software itself is free to use. A managed cloud version is also available.
Can I self-host WebLLM Chat?: Yes. WebLLM Chat can be self-hosted on your own server or infrastructure.
What is WebLLM Chat an alternative to?: WebLLM Chat is an open-source alternative to ChatGPT and Claude. Other open-source alternatives to ChatGPT include GPT4All, Jan and Zola Chat.
Is WebLLM Chat actively maintained?: The most recent commit to WebLLM Chat was on 18 February 2026. The project has 1.1k stars on GitHub.