WebLLM

● Identity checked

Code · Vendor site 2026-10-04

WebLLM is a high-performance in-browser large language model inference engine that uses WebGPU acceleration to run models locally without server-side processing. It supports OpenAI-compatible APIs, streaming, function calling, and many open models installable via NPM, Yarn, or CDN.

Updated 2026-10-04View sources

Official website

Category: Code
Free access: WebLLM is an open-source browser inference project with no subscription pricing on the project homepage.
API access: Projects can integrate WebLLM with OpenAI-compatible APIs supporting JSON mode, function calling, and streaming.

Is WebLLM right for you?

A good fit for

Developers who want private, client-side LLM inference directly in web applications without routing prompts to a hosted API.

Before you choose

Performance and supported models depend on the visitor browser WebGPU capabilities and chosen model weights.

Browser-native LLM engine

WebLLM brings generative AI directly into browser tabs with OpenAI-compatible APIs and WebGPU acceleration.

What it can do

Features & capabilities

Unknown is different from unavailable. Each fact carries its own evidence.

Capability	Value	Evidence	Checked
In-browser inference	WebLLM runs LLM operations in the browser using WebGPU hardware acceleration.	Facts sourced	2026-10-04
Model support	The engine supports Llama, Phi, Gemma, Mistral, Qwen, and other models in MLC format.	Facts sourced	2026-10-04
Integration	Developers can install WebLLM via NPM, Yarn, or CDN with modular UI hooks.	Facts sourced	2026-10-04

Understand the total cost

WebLLM pricing & plans

Free

WebLLM is an open-source browser inference project with no subscription pricing on the project homepage.

Access: WebLLM is an open-source browser inference project with no subscription pricing on the project homepage.

Explore pricing & history

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The practical questions

Frequently asked questions

What is WebLLM used for?

Does WebLLM have a free plan?

WebLLM is an open-source browser inference project with no subscription pricing on the project homepage.. This record lists ongoing free access; check the plan limits before starting.

How much does WebLLM cost?

No paid monthly price is listed; this record treats the product as free to start. See the plan cards for entitlements, billing commitments and seat minimums.

Can I use WebLLM through an API?

Projects can integrate WebLLM with OpenAI-compatible APIs supporting JSON mode, function calling, and streaming.. API access and subscription access may have different terms; consult the linked sources.

What should I check before choosing it?

Performance and supported models depend on the visitor browser WebGPU capabilities and chosen model weights.

Price history

No retained pricing changes yet. A current price alone does not establish a historical trend.

How this profile is supported

Identity and profile

Reviewed vendor source

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2026-10-04

Facts apply to the named version and check date. Send a sourced correction if something changed.