I built this because I kept losing track of important parts in my long conversations with Claude/ChatGPT.
Threadline adds a sidebar that shows all your messages as a clickable table of contents. Click any entry, jump straight there. Hover to preview the full message before navigating.
Works on both Claude and ChatGPT. Auto-updates as you chat, matches dark/light themes, and stays out of your way when you don't need it.
https://chromewebstore.google.com/detail/aamihahiiogceidpbnf...