AI Cost Viewer is a Chrome extension designed to provide real-time tracking of AI API costs for OpenAI, Anthropic Claude, and Google Gemini models. This free tool displays the exact cost of each API request as it occurs, eliminating unexpected expenses and enhancing financial transparency for developers and users alike. Key features include a real-time cost overlay, session cost summary, and detailed per-request breakdowns, making it highly beneficial for developers, product managers, and researchers looking to monitor their AI usage effectively.

The extension works seamlessly on popular platforms like ChatGPT, Claude, and Google AI Studio without requiring any configuration. It operates locally in the browser to ensure user privacy, with no data being sent to external servers. Users can easily export their session costs for further analysis, making it an ideal tool for freelancers and agencies. With its lightweight design and zero impact on page performance, AI Cost Viewer stands out as a must-have tool for anyone working with AI APIs.