ChatExtender is a Mac app that wraps your own logged-in ChatGPT and Claude accounts to provide persistent memory, long conversations that never lose context, and full-text search across every chat. It automatically hands each new session a running summary plus saved notes and files so context is never silently lost when a thread grows long. All conversation history is stored locally on your Mac and never leaves the device. The app is available for a one-time purchase of $30 with no subscription, and is currently in private beta.