You can read all about Teacherserver.com at Ed Week’s article, How One Researcher Used Teacher Feedback on AI to Create a New K-12....

It’s a free site that seems to respect data privacy, and offers more teacher tools than you can shake a stick at.

I think you can do most of activities there on ChatGPT on your own (but may be wrong on that). However, it’s clearly a lot easier using the Teacherserver site than having to continually write your own prompts to a chatbot.