Providing on-line non-downloadable software for allowing users to securely and privately upload data in order to get personalized health recommendations; Providing on-line non-downloadable software for allowing users to receive concrete health insights and track progress; Providing on-line non-downloadable software for allowing users to customize, engage with and communicate with AI characters and personas; Providing on-line non-downloadable software for using digital twin technology for allowing users to engage with health data; Providing online non-downloadable computer software platforms for use in providing users with customized health recommendations and information about how to improve healthspan; Providing online non-downloadable computer software platforms for use in providing users with an online agent to answers to health questions; Providing temporary use of online non-downloadable chatbot software using artificial intelligence for allowing users to engage with health-expert curated information and data, as well as receive health recommendations