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Quick search ranks up to 60 of the most relevant papers for your query. Deep search reads up to 200, which matters for broad questions and cross-disciplinary topics.
It maps the papers in your search as a landscape: topics that are well studied form deep basins, and the barriers between them are the open gaps. Each paper gets an Impact score for how much of a gap it closes. Opening a graph you already built does not count again.
Yes, anytime. Your plan stays active until the end of the period you paid for and is not renewed after that.
No. You sign in to both with the same account, but each product has its own plan, so you only pay for what you use.