WebSage - AI Browser Extension is a Chrome add-on developed by BrowserNative, available for free. This extension offers AI-powered summary and explanation capabilities, enabling users to utilize custom prompts for enhanced functionality. It integrates with OpenAI and Google Gemini, including Chrome's built-in Gemini Nano model.

Users are required to provide their own OpenAI or Google Gemini API key to leverage the extension's features. Supported AI models include OpenAI's GPT-4o-mini, GPT-4 Omni, and gpt-3.5-turbo, as well as Google's Gemini Pro and Gemini Flash versions. Additionally, experimental support is offered for Chrome's built-in Gemini Nano model. For detailed usage guidelines and privacy policies, users can refer to the provided webpage.