NotebookLM
It only answers from documents you upload — so it cannot wander off and invent things. Start here if you care about being right.
Pros
- +Answers only from your own sources
- +Cites the passage behind each claim
- +Free tier is genuinely usable
Cons
- −Useless without documents to feed it
- −Will not search the open web
- −Upload limits on the free tier