If you want to build your own chatbots using your own content and domain expertise, CustomGPT is a good choice. The service lets businesses use GPT-4 technology for chatbots that can provide authoritative and knowledgeable responses. It's designed to be easy to set up with no programming required, either by adding it to a website or uploading a document, and can be used in a variety of ways, including through an application programming interface and customized pricing. The service has a range of pricing levels for everything from small to large businesses.