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Margin notes for Claude, ChatGPT, and Gemini. Highlight text, ask in a side bubble, never touch the main thread. Offthread (formerly Tangent) adds margin notes to Claude, ChatGPT, and Gemini. Highlight any span, click Ask Offthread, and ask a short question in a bubble next to the text. The answer streams into that bubble. Your main conversation stays untouched. Features • Ask Offthread on Claude, ChatGPT, and Gemini • Side bubbles docked next to the message • Streaming answers from your existing session (no API key) • Follow-ups stay inside the bubble thread • Soft persistence per conversation • Collapsed chips that expand when you need them again How to use 1. Install Offthread and sign in to Claude, ChatGPT, or Gemini as usual. 2. Open a conversation and highlight text in a reply. 3. Click Ask Offthread. 4. Type your question in the bubble and send. 5. Click outside to collapse; expand the chip later to continue. Requirements • Chromium-based browser with the CSS Custom Highlight API (Chrome 105+) • An active session on the host you are using Notes • Runs on claude.ai, chatgpt.com, chat.openai.com, and gemini.google.com • Uses the signed-in session in the page; there is no separate Offthread account • Host web APIs can change; if something breaks, check for an extension update Site: https://r0han99.github.io/offthread/ Source: https://r0han99.github.io/offthread/ Privacy: https://r0han99.github.io/offthread/privacy.html