OpenCat – AI Chat, Agent, MCP

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OpenCat is a cross-platform application for macOS, iOS, and iPad designed to integrate artificial intelligence into daily workflows. The app provides a unified interface for chat, writing assistance, translation, and search tasks. Users can access AI capabilities through multiple channels: downloading open-source models locally for offline use via Apple silicon acceleration, connecting personal API keys from over 25 providers, or subscribing to OpenCat Cloud for immediate access to major commercial models without configuration. A key feature is system-wide translation, allowing users to select text in any app for instant LLM-powered translation. Additional tools include an AI keyboard for inline text polishing, MCP support for tool calls, and content rendering for LaTeX, Markdown, and code. Data privacy is emphasized through local storage and iCloud syncing. The app supports online search via OpenCat Cloud and select providers.