Built a free tool to bookmark individual ChatGPT responses (not full chats)

ChatGPT's bookmark/archive only works at the conversation level, which is annoying when one chat has 15 messages and you only want to keep one answer. Coffer adds a save button to every response. You can: * Save the one answer you care about, not the whole chat * Tag and search across saved responses * Mix snippets from ChatGPT, Claude, and Gemini in one vault Everything is stored locally in your browser. No account, no servers, no tracking. Free, just shipped to the Chrome Web Store. Built it because I kept losing useful ChatGPT outputs in long sessions and the existing solutions all wanted me to sign up for something.