Blue

Blue is a native macOS client for ChatGPT that opens with option and space inside any app. AppVision reads the active window for context, and messages stay encrypted on the device rather than in the cloud.

Blue is a native macOS application that puts ChatGPT inside whatever app is already open. Instead of copying text into a browser tab, the user presses option and space, and a chat window appears on top of the current document, spreadsheet or editor. The app then answers using the context of the active window, so a request for a summary, a translation or a rewrite does not need a pasted excerpt or a long explanation of what the work is about. The mechanism behind that context is AppVision, which Blue describes as a layer built on the accessibility technology already inside macOS. It reads the text and the spatial layout of the frontmost window (alignment, positioning and other visual cues) and passes only that material to the model when a question is asked. AppVision can be switched off entirely, and Blue says it never retains the data sent with a request. The client also picks between models automatically, routing heavy jobs to GPT-4o and lighter work to GPT-3.5 Turbo, and can use a personal OpenAI API key for users who prefer to manage their own limits. The audience is professionals who already use AI daily but dislike pasting sensitive material into a consumer chatbot. Privacy is the pitch: messages and files stay on the Mac encrypted with AES-256 under the user's Apple ID, traffic uses TLS 1.2 or above, EU users can keep processing inside the EU on the Professional tier, and no query is used for model training. GDPR compliance is a stated design goal rather than an afterthought. Against plain ChatGPT, Blue trades the browser for speed and locality, and trades a broad plugin ecosystem for a narrow, deep macOS integration. Teams needing shared workspaces and admin controls will find it thin; individuals who work window to window on a Mac and care where their data sits will find it a clean fit.