AI Engine: the best WP AI Plugin tool

I have been looking for AI Chatbot and RAG tool plugin in WP for sometime and had tried different AI free plugins. I found that Meowapp AI Engine is the one most easy to setup and use. It has many useful features even in the free version. After testing the reliability of the plugin and seeing the technical responses in its support forum, I decide to purchase the Pro version since it includes some advanced features like embeddings for RAG function, which allows AI query on my own uploaded docs.