Show HN: I made an AI-powered checklist management web app (checkoff.ai)

I've found that I increasingly use simple checklists to keep track of what I need to do. Although there are lots of checklist apps out there, I couldn't quite find the one that does all the stuff I need, so I made a new one. It allows you to do things such as:

- create templates and then create multiple checklists from them (for example, morning routine template) - use LLM to auto-populate the checklist items by name and descriptions (best historical fiction books to read, etc) - auto-expand the checklist and item descriptions

The app is completely free, including the AI features. Try it out and let me know what you think.