OpenCat

OpenCat is a native AI client for Apple platforms, designed so that chatting with an AI assistant feels as smooth as using any well-made Mac or iOS app. Instead of relying on a web interface, it ships as a downloadable application for macOS and a mobile app for iPhone and iPad, with fast, responsive scrolling, native text selection, and system-level integrations that a browser tab simply cannot offer.

Its feature set reaches well beyond a plain chat window. OpenCat supports multiple AI models, so you can route different tasks to different assistants, and includes a prompt library to save the prompts you use repeatedly. Voice chat lets you hold a spoken conversation and hear replies, while Siri Shortcuts let you jump into a chat without opening the app. The keyboard extension is the standout: it puts AI completion and question answering directly into Messages, Notes, Mail, and other apps. On top of that, OpenCat handles text-to-image generation, image-based conversations, translation, and Markdown rendering with bold, italics, links, and code blocks.

Pricing is structured to meet different needs. The free tier covers the essentials — prompt library, Markdown rendering, and access to multiple models — while the one-time OpenCat Pro purchase unlocks the keyboard extension, iCloud sync, Siri integration, and text to speech. A separate Cloud AI subscription provides fast access to multiple hosted models, including voice chat, vision chat, and text to image, for people who would rather not manage their own API keys. The app is built by an independent developer and is not affiliated with OpenAI, Anthropic, or any other model vendor it can connect to.