OpenCat is a native AI client for OpenAI/ChatGPT, designed to provide a seamless and efficient chat experience on iOS, macOS, and iPadOS devices. It allows users to use their own API keys and does not require a login. The app offers fast response times, a prompt library, and cross-device synchronization to enhance user interaction with AI models. Its intuitive interface is tailored to deliver a superior user experience.

Write Mail AI is an advanced AI email generator that helps users write, analyze, and reply to emails effortlessly. It offers various personalization options, including selecting the language and tone of the response. This service is free and does not require logging in, making it easy to generate responses for different email services. With a user-friendly interface, users can copy the generated email response and paste it into their preferred email service, editing as necessary to ensure the message meets their needs.