NextAI Translator is a multi-platform translation application that provides text translation, polishing, summarization, and OCR capabilities using various LLM providers. It operates as a browser extension (Chrome/Firefox), desktop application (Windows/macOS/Linux via Tauri), userscript, and Safari extension. The application features a modular architecture with shared core logic and platform-specific implementations, supporting real-time text selection translation, translation history, vocabulary management, customizable actions, and text-to-speech functionality. Built with React, TypeScript, and Vite, it employs sophisticated cross-platform abstractions for fetch operations, settings management, and AI provider integration.