Monica is a comprehensive AI assistant available as a browser extension and mobile/desktop app that integrates multiple cutting-edge AI models including GPT-5, Claude 4.5 Sonnet, Gemini 3 Pro, and DeepSeek V3.1. It offers advanced chat capabilities with the ability to switch between different language models, real-time web search and summarization of web pages, PDFs, and YouTube videos. Monica includes writing assistance features for content creation, email reply suggestions, image and video generation, voice input/output support in multiple languages, document analysis, and a smart search agent that cross-references multiple keywords to find accurate answers. The tool functions as a sidebar accessible from any webpage and provides context-aware assistance across browsers, desktop, and mobile platforms.