Comparison guide
AI tools for academic research
Paper discovery, source-grounded answers and document analysis. Compare citation support, free access and data handling.
| Criterion | Perplexity | Elicit | Consensus | Julius AI | Gemini Notebook (formerly NotebookLM) |
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| Provider | Perplexity AI | Elicit | Consensus | Julius AI | |
| What it is for | An AI answer engine that searches the web and cites sources, with access to models from several providers on paid plans. | An AI research assistant that searches academic papers, extracts data into tables and produces research reports and systematic reviews. | An AI search engine that answers questions using peer-reviewed research, with Deep Search for literature-review style reports. | An AI workspace for analysing spreadsheets and databases in plain English, and creating charts, reports, slides and websites. | Google's source-grounded research notebook, renamed from NotebookLM to Gemini Notebook in July 2026. |
| Latest confirmed model | — | — | — | — | — |
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| Free plan | Yes 3 Pro Searches/day; 1 Research query/month; limited uploads | Yes Limited Research Agent and Reports usage | Yes 10 Pro messages and 3 Deep Searches per month | Yes Daily credits | Yes 100 notebooks per user; 50 sources per notebook |
| Cheapest paid plan | Education Pro: $10/mo With SheerID student verification | No monthly list price | No monthly list price | Plus: $20/mo $16/mo billed annually | No monthly list price |
| API access | Yes · docs (opens in a new tab) | Yes · docs (opens in a new tab) | Yes · docs (opens in a new tab) | No | No |
| Learning curve | Beginner-friendly | Some experience helps | Beginner-friendly | Beginner-friendly | Beginner-friendly |
| Last verified | Oct 19, 2026 | Oct 19, 2026 | Oct 19, 2026 | Oct 19, 2026 | Oct 19, 2026 |
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How to choose
- Need answers tied to your own PDFs: a source-grounded notebook.
- Need to find papers: a paper-search tool with citations.
- Verify every citation against the original paper.
The table shows up to five entries in the directory's editorial order, not a ranking. Every value links back to a record with sources and a last-verified date.