OpenCat is a macOS and iOS native client that uses OpenAI API. It works out of the box. It is more convenient than the official web version and supports custom API addresses.
For this App, the developer @Baye complained like this:
OpenCat has a next-day retention rate of 62%, which can be said to be the product with the best data, but I don’t feel excited and inspired at all. This is the least technical or branded product I have ever made. It is just an api wrapper. I only felt the power of the hot spot, not mine. This feeling makes me very confused.
The biggest convenience of using OpenCat is that it can be used immediately, without waiting for the webpage to load, and without jumping out of real person detection, you can ask questions when you open it.
