Research

Perplexity fits open questions about the world, since it searches the web and shows the sources behind each answer. NotebookLM fits when the answer must come from your own material, such as a folder of reports or interview notes. Claude is strong at reading long documents and reasoning through them, for example comparing two contracts. Many people use Perplexity to find sources and NotebookLM or Claude to work through them.

NotebookLM, Claude, Elicit and ChatGPT can all be used without paying. Elicit's free plan runs on credits, so heavy literature reviews need a paid tier. Paid plans across these tools add more usage, longer reports and team workspaces. Start free on one real question and upgrade the tool you return to.

ChatGPT searches the web, analyses files and answers everyday questions, which covers a lot of research. Perplexity is built around sources: every claim links back, and you can narrow the search to academic or specific sites. NotebookLM keeps answers inside your own documents and cites the passage, which reduces made-up details. Add one of them if you often need to show where a fact came from.

Open the cited source and find the sentence the answer relies on, especially for numbers, dates and quotes. Perplexity and NotebookLM make this quick because each answer links to its source or passage. Ask the same question a second way and compare the results. For anything you publish or base a decision on, confirm the key fact in a primary source.

Elicit is built for it: it searches scientific papers, summarises findings and extracts data from studies into tables. Perplexity can narrow its search to academic sources. NotebookLM works well once you have the papers, answering questions across them with citations. Check your university's or journal's rules on AI use before you rely on any of them in published work.