chathub

ChatHub is a browser extension for Chrome and other Chromium-based browsers that lets you chat with multiple AI assistants from a single interface. Instead of opening separate tabs for different services, you open one panel and can send messages to ChatGPT, Google Gemini, Claude, Grok, DeepSeek, Llama, and others at the same time. Their responses appear side by side, which makes it easy to compare how different AI systems answer the same question.

The extension saves your conversation history locally on your device rather than sending it to any external server. You can export and import all your data, share individual conversations as markdown text, and use a built-in prompt library that includes both your own saved prompts and community-contributed ones. It also supports a keyboard shortcut to open the chat panel from anywhere in the browser without navigating away from whatever page you have open.

Other features include dark mode, web access so the AI can look things up, and proper formatting for code and markdown in responses. It supports direct API connections for ChatGPT and Claude alongside their web interfaces, and works with several open-source models as well.

To install it, you can find it in the Chrome Web Store by searching for ChatHub. If you prefer to build it yourself from source, the README includes steps to clone the repository, install dependencies with Yarn, build the project, and load the resulting folder as an unpacked extension in Chrome or Edge developer mode. No account or server setup is required to use the basic features.