TokenScope is a lightweight browser extension that quietly watches the LLM API calls made by any tab - ChatGPT, Claude, Gemini, or any OpenAI-compatible endpoint - and shows you in real time exactly how many tokens went in and out. Zero config. No account needed. 100% local - nothing ever leaves your browser. Works with ChatGPT, Claude, Gemini, OpenRouter, DeepSeek, and any custom gateway.