AI search with source-linked answers
Perplexity
Perplexity brings web sources, document analysis and Research reports into one search workspace, with Projects that keep files and context together.
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Find answers, discover relevant papers and make sense of source material with AI search and research tools. Our collection covers web-answer engines, academic discovery and assistants that work with your own documents.
Perplexity brings web sources, document analysis and Research reports into one search workspace, with Projects that keep files and context together.
Turn documents, websites and media into cited research answers, Audio Overviews, study aids and presentations with Gemini Notebook, formerly NotebookLM.
Find studies, extract evidence into tables and produce cited reports with Elicit’s Research Agent and dedicated systematic-review tools.
Search scientific papers, read cited AI answers and explore longer literature reviews with tools for study details, evidence tables and saved research.
Discover research and inspect the context behind its citations, with supporting, contrasting and mentioning statements, cited AI answers and paper collections.
Add web search, page extraction and cited research answers to AI applications with You.com’s Search, Contents, Answer and Research APIs.
Search scientific papers, explore citations and organise a research library with Semantic Scholar, Ai2’s free academic discovery tool.
Find academic papers, ask cited questions about PDFs and extract evidence into comparison tables with SciSpace’s research tools and AI Agent.
ChatGPT combines Deep Research and file uploads with a general assistant; research allowances vary by subscription.
Gemini includes Deep Research alongside conversation and connected Google features, with tier-dependent access.
Perplexity combines web search with answers and source links. General assistants such as ChatGPT and Gemini also offer research tools, while You.com focuses on web search and grounded-answer APIs for developers. These services address current web information rather than a fixed library of uploaded documents.
Elicit supports evidence extraction and review tables. Consensus centres on scientific paper search, and Scite adds the context in which other papers support, discuss or contrast a citation. Semantic Scholar offers free literature discovery and citation connections. Together, these tools cover different stages of academic research.
Source-based notebooks and PDF assistants organise material supplied by the reader. Gemini Notebook produces source-grounded explanations and audio overviews; SciSpace offers PDF chat alongside literature tools. Source references make an answer easier to trace, while access to a paper’s full text still depends on its publisher and availability.
Elicit, Consensus, Scite, Semantic Scholar and SciSpace focus on scholarly material. Their strengths include paper discovery, extraction, citation context and PDF reading rather than general-purpose web browsing.
Several tools support uploaded PDFs or paper files. Upload allowances, extraction features and exports differ between products and subscription tiers.
AI assistants bring writing, research and creative tools into a conversation. Discover leading chatbots for answering questions, working with documents, generating images and getting more from the apps you already use.
Write clearer copy, polish a draft or translate a document with specialist AI writing tools. Discover grammar checkers, paraphrasers, translation services and content platforms for personal and professional writing.
Build study resources, practise languages and prepare classroom materials with AI learning tools. Explore tutoring assistants, flashcards, document-based study and teacher platforms with dedicated classroom features.
Convert, edit and prepare files with our own browser utilities.
Product information checked 3 October 2026. About our editorial coverage
