Echoo is a macOS application that uses artificial intelligence to transform text directly within the user’s existing applications. Its primary function is to allow users to draft content in their native language and then convert it into polished, professional English using a keyboard shortcut. The tool also supports rewriting, translation, summarization, and voice dictation, all without requiring the user to switch tabs or perform copy and paste operations. The application operates by integrating with macOS Accessibility features. After installation and granting the necessary permissions, users can select text in any Mac app, trigger a command via a customizable keyboard shortcut or voice, and receive the processed result inline. Echoo includes a set of ready made commands for improving clarity, grammar, and translation while preserving the user’s original tone and meaning. Users can also edit these command prompts to tailor the output to their specific needs. Echoo offers two modes of operation. In the cloud mode, each request is sent to a selected AI provider under that provider’s data policy. In local mode, processing occurs on the user’s Mac. The application provides 10 free credits upon installation, with no requirement for an API key or credit card. For continued use, users can subscribe to the Pro plan at $6.99 per month, which includes 300 credits each month, or they can bring their own provider key (BYOK) to use the tool for free. Typical use cases include drafting emails, messages, or documents in a non English language and receiving natural English output, rewriting existing text to adjust tone or style, and summarizing longer passages. The workflow involves installing the app, granting Accessibility access, selecting text, and pressing a shortcut. Echoo was featured in VVMac Magazine and has received verified user reviews. The application is designed for macOS and requires the user to grant Accessibility permissions for text selection interaction.