AssisChat is an AI assistant chat app designed for iPhone users. This app offers powerful and simple functions with high customization ability. Users can interact with AI models like OpenAI (ChatGPT) and Anthropic (Claude) by utilizing custom API keys. Additionally, the app allows flexible customization of conversation rules and supports sharing content to chats from other apps through the Share Extension feature.

Moreover, AssisChat integrates seamlessly into input fields with its Keyboard Extension, enabling a smooth user experience. It also provides URL content fetching, iCloud Sync, Markdown support for messages, streaming message replies, auto copy messages, custom themes, and more. AssisChat caters to users looking for an AI-driven assistant chat app with extensive customization options.