Are there any free or low cost AI alternatives to deep research

Deep research just started allowing people to create 5 reports a month for free. This is a pretty awesome service. Right now I’m writing up a report about a health issue I have that I don’t really understand to get some ideas on the causes.

For people who want more than 5 reports a month, what alternatives are there?

I found this website with 4 alternatives.

Perplexity AI is supposedly a good alternative to deep research.

Does anyone have experience on deep research or deep research alternatives?