ChatGPTBox

A free browser AI assistant connects to self-hosted or cloud models for page summaries, selected-text tasks and branching chats, under the MIT license.

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ChatGPTBox is a browser extension for people who want AI help while reading pages or searching the web. It connects to self-hosted models or services such as ChatGPT, Claude, Moonshot and Azure.

Page and video summaries: Summarize web pages from the context menu and use site integrations for video summaries and Git analysis.
Selected-text tools: Translate passages, edit writing, analyze sentiment or ask for code explanations from text selected on a page.
Search and site integration: Add AI responses to search results and use integrations with Reddit, Quora, YouTube, GitHub, GitLab and StackOverflow.
Branching conversations: Keep chats in floating windows or a separate conversation page, branch discussions, and save complete records or copy individual parts.

Responses support code highlighting and mathematical formulas. You can disable individual site integrations and selection tools, and custom API addresses let you choose the connected service.

The extension runs in the browser, while the selected backend handles model requests. A self-hosted connection uses your own model service; a cloud connection sends requests to that provider. ChatGPTBox is free and open source under the MIT license, with mobile-device support.