X =
Chat with your documents
Ask questions across your own PDFs, spreadsheets, and documents and get answers you can check against the source.
Use
SearchPlus
SearchPlus turns a set of your documents into a workspace you can question: every answer cites the exact passages it draws on, and Deep Analysis (in beta) works across documents. Workspaces persist, so a collection you build today is still there for the next question.
Best for
Document collections you question again and again, like due diligence or research
Input
PDF, DOCX, XLSX, and TXT files, or supported web pages
Output
Answers with inline citations, inspectable excerpts, and cross-document analysis
Pricing
Pro $9.99/mo; Team $39.99/mo (3 users)
Use something else if
Use NotebookLM instead if you want a free tool and are happy working inside a Google account
NotebookLM grounds answers in the sources you upload with citations and adds summaries and audio overviews; the core product is free.
Alternatives in full
Tool
Best for
Input / output
Pricing
SearchPlus
Persistent workspaces and cross-document analysis
PDF, DOCX, XLSX, TXT, or web pages / cited answers and Deep Analysis
Pro $9.99/mo; Team $39.99/mo (3 users)
NotebookLM
Free, source-grounded answers with citations
Your sources to cited answers, summaries, audio overviews
Free; Plus tier (see site)
Related values of X
Based on each tool's official site, checked 2026-09-22 and 2026-09-23. No hands-on test. SearchPlus Pro includes 600 pages a month and Team 3,000, with per-page charges beyond that; Deep Analysis is in beta; the site notes AI answers can be incomplete or inaccurate.