LLM for WhatsApp

LLM for WhatsApp is a free desktop app that turns WhatsApp into an AI-assisted inbox, automatically composing and sending replies powered by the large language model of your choice. The open-source project has more than 160 stars on GitHub and is released under the MIT license.

Overview

Instead of a cloud service, LLM for WhatsApp runs on your own computer — Windows, macOS or Linux. You download the release package, run the setup script for your platform, connect your WhatsApp account, and the app watches your incoming chats. When a message arrives in a chat where auto-reply is enabled, the app sends the conversation to your chosen model — OpenAI’s GPT models, a local model served by Ollama or llama.cpp, a Hugging Face endpoint, or another custom LLM API — and posts the generated reply for you. Conversation history is kept per chat so answers stay in context, and a customizable system prompt lets you define the assistant’s tone and role, for example a support agent for your small business. Setup is deliberately light: the release bundle installs what it needs and launches the app, with a manual path documented for developers. The project was actively updated into 2025.

Key Features

• Multi-provider LLM support – OpenAI GPT, local models via Ollama and llama.cpp, Hugging Face and custom APIs.
• Selective auto-reply – turn automatic answers on or off per chat, so only chosen conversations are handled.
• Custom system prompts – define exactly how the assistant should behave, sound and sign off.
• Conversation memory – message history is maintained so replies stay coherent across a thread.
• Cross-platform desktop app – one download with guided setup scripts for Windows, macOS and Linux.
• Self-hosted privacy – messages are processed on your machine and sent only to the model provider you pick.

💳 Pricing

LLM for WhatsApp is free and open source under the MIT license. You pay nothing for the app itself; if you connect a commercial API such as OpenAI you pay that provider’s usage fees, while local models run at no cost.

Who Is It For

It is aimed at freelancers, small-business owners and community managers who answer a high volume of WhatsApp messages and want an AI first responder — especially those who prefer local models and keeping data on their own machine.