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3 other AI Search & Research tools we have sourced reviews for, from the same category (AI Search & Research). Within that, they're ordered by aitrove popularity, not by a quality score: we haven't tested them hands-on, so we don't rank them as "best".

ChatPDF in one minute

Best for: Quick Q&A on a text-based PDF.

Biggest catch: Free allows only 2 document analyses a day.

Skip it if: You work through many long documents a day and won't pay.

Price: Free tier: yes (2 documents/day, no account needed). Plus: unlimited documents. US iOS App Store lists $14.99/mo or $89.99/yr. Web price is shown at checkout. (checked Oct 10, 2026)

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At a glance

ToolBest forBiggest catchStarting price
NotebookLM (Gemini Notebook)Students and researchers digesting a pile of documents.Usage is compute-based, refreshing every 5 hours up to a weekly limitFree tier: yes. Higher limits via Google AI Pro ($19.99/mo). (checked Oct 10, 2026)
ElicitResearchers doing preliminary literature scans.One published study found search sensitivity of ~33–40% vs traditional searchingFree tier: yes. Plus $11/user/mo (annual), Pro $39/user/mo (annual). (checked Oct 10, 2026)
Perplexity Spaces (now Projects)Teams running ongoing research topics in Perplexity.Spaces have been renamed Projects, so the listing name is staleIncluded with Perplexity. Collaboration on Pro ($20/mo) and up. (checked Oct 11, 2026)

1. NotebookLM (Gemini Notebook)

AI Research Tools · Research Assistants

Best for: Students and researchers digesting a pile of documents.

Pros

  • Free with a Google account: 100 notebooks, 50 sources each
  • Answers are grounded in the sources you upload
  • Google AI Pro raises it to 500 notebooks / 300 sources each

Biggest catch

Usage is compute-based, refreshing every 5 hours up to a weekly limit

Skip it if: You need cross-project memory across many notebooks.

Starting price: Free tier: yes. Higher limits via Google AI Pro ($19.99/mo). (checked Oct 10, 2026)

Full NotebookLM (Gemini Notebook) review · NotebookLM (Gemini Notebook) alternatives

Sources for NotebookLM (Gemini Notebook)

2. Elicit

AI Research & Science · Research Assistant

Best for: Researchers doing preliminary literature scans.

Pros

  • Searches more than 138M papers, with unlimited summaries on Free
  • Data-extraction tables speed up literature reviews
  • Plus is $11/mo billed annually

Biggest catch

One published study found search sensitivity of ~33–40% vs traditional searching

Skip it if: You need exhaustive, systematic-review-grade search.

Starting price: Free tier: yes. Plus $11/user/mo (annual), Pro $39/user/mo (annual). (checked Oct 10, 2026)

Full Elicit review · Elicit alternatives

Sources for Elicit

3. Perplexity Spaces (now Projects) Renamed

AI Research Tools · Research Assistants

Best for: Teams running ongoing research topics in Perplexity.

Pros

  • Shared research workspaces with files, context and collaborators
  • Up to 5,000 files and 2.5 GB per project on every plan
  • Pro and Max can invite 5 collaborators, Enterprise up to 9,999

Biggest catch

Spaces have been renamed Projects, so the listing name is stale

Skip it if: You only do one-off searches.

Starting price: Included with Perplexity. Collaboration on Pro ($20/mo) and up. (checked Oct 11, 2026)

Full Perplexity Spaces (now Projects) review · Perplexity Spaces (now Projects) alternatives

Sources for Perplexity Spaces (now Projects)

Pros, catches and prices are compiled from public sources (official pricing and docs pages, published reviews, user reports), not hands-on testing. Prices change often, so check the vendor page before you buy.