ChatGPT, Claude, Gemini and Grok can answer almost anything, but finding an old answer is another story. If you remember what an AI told you but not the conversation title, you're stuck scrolling. ChatShelf searches the actual messages inside all four AI assistants from one place, so you can find the answer you remember without remembering where you had the conversation. Everything is indexed locally in your browser. No server. No account. Nothing is uploaded.