AI Research Tools for Web, Academic, and Document Research
12 tools · listed in dataset order, no ranking
These tools differ mainly in what they search. Perplexity answers from the live web with numbered citations. Elicit and Consensus search academic literature, including preprints, and Scite shows whether later papers support or contrast a finding. Gemini Notebook (formerly NotebookLM) answers only from the documents you add. Exa Agent and You.com sell search and research APIs for developers building their own products. Deep Review, from Google Research, does not search for sources at all: it reads a paper or technical document you upload and writes a critique of it. OpenScience is an open-source agent that reads papers and runs analysis code, and OpenMAIC turns a topic or document into an interactive lesson. Pick by the sources your question needs, then check how each tool cites them.
Perplexity
Perplexity AI
AI Search Engine
Best for: Fact-checking, current events research, and cited answers
Elicit
Elicit
AI Research Assistant
Best for: Researchers, students, and R&D teams who need to process large volumes of scientific literature efficiently
Consensus
Consensus
AI Science Search Engine
Best for: Non-experts and analysts who want clear, source-backed answers from the scientific literature
You.com
You.com
Web Search & Research APIs for AI, plus Multi-Model Chat
Best for: Developers building AI agents and LLM apps that need real-time web search, content extraction, or research via API
Gemini Notebook (formerly NotebookLM)
AI Research Assistant for Your Documents
Best for: Researchers and students who need to ask questions about a defined set of documents with cited answers
Scite
Research Solutions (Scite)
Citation Intelligence for Scientific Research — Supporting vs Contrasting Evidence
Best for: Researchers, scientists, and systematic reviewers who need to evaluate the evidentiary weight and replication status of specific claims in the scientific literature — not general topic discovery
Exa Agent
Exa
Exa Agent: Web Research Agent API for List Building, Enrichment, and Deep Research
Best for: Developers and data teams who need cited, structured web research inside their own product or pipeline, such as account lists, CRM enrichment, due diligence, or KYC/KYB checks, without building their own search-and-verify agent loop
OpenScience
Synthetic Sciences
OpenScience: Open-Source AI Research Agent and Workbench for Scientific Computing
Best for: Computational scientists, ML researchers, and research engineers who want an open-source agent that runs analysis code and experiments on their own files and compute, with a full record of each step and their choice of model provider
OpenMAIC
Tsinghua University (THU-MAIC)
OpenMAIC: Open-Source Multi-Agent Classroom That Turns Topics and Documents into Interactive Lessons
Best for: Self-learners, teachers, and course or training builders who want AI-generated, multi-agent interactive lessons from a topic or their own materials, and technical teams that want to host, modify, or embed that capability under an MIT license
Deep Review
Google Research
Deep Review: Google Research's Multi-Agent Reviewer for Papers and Technical Documents
Best for: Researchers and graduate students who want a rigorous pre-submission check of a math- or experiment-heavy paper, and engineers, analysts, or lawyers who want a second read of a long technical, legal, or financial document
AlphaSense SuperAnalyst
AlphaSense
AlphaSense SuperAnalyst: AI Research Agent That Builds Cited Memos, Models and Decks from Broker Research and Filings
Best for: Buy-side and sell-side analysts, private equity and corporate development teams, and corporate strategy or competitive intelligence groups that already rely on AlphaSense content and want the platform to produce cited memos, models, dashboards and decks rather than answers they assemble by hand
DeepTutor
HKUDS (Data Intelligence Lab@HKU)
DeepTutor: Open-Source, Self-Hosted AI Tutor with Mastery Paths, Knowledge-Base RAG, and Inspectable Memory
Best for: Self-learners, students, and technically comfortable teachers or research labs who want a free, self-hosted tutor that teaches from their own documents, tracks mastery, and keeps an auditable memory, using whichever model provider or local model they choose
How to choose an AI research tool
Start with the sources your question needs
Recent events, product information, and fast-moving topics call for live web search: Perplexity searches the web for each question and lists numbered sources. Questions that studies answer call for an academic index. Elicit searches over 138 million papers from Semantic Scholar, PubMed, and OpenAlex, and Consensus indexes papers from Semantic Scholar, OpenAlex, PubMed, and publisher feeds. Both include preprints alongside journal articles (Consensus tags them), so check a paper's status before you rely on it. When the material is already in hand, such as reports, transcripts, or course readings, Gemini Notebook answers only from the sources you add.
A citation tells you where to look, not that the answer is right
Perplexity, Elicit, Consensus, and Gemini Notebook link their answers to sources, but the summary in between is still AI-generated, and Consensus says so in its own documentation. Without full-text access, Elicit works from a paper's title and abstract. Scite answers a different question: it classifies how later papers cite a finding (supporting, contrasting, or mentioning), which helps you weigh the evidence behind a claim rather than find it. Deep Review turns the check on your own draft: it reviews a manuscript or technical document for logical and mathematical problems and claims that need support, compares it with existing work, and leaves higher-level judgments to people. Its findings are a second read to act on, not a verdict. Read the original before you quote or cite it.
Freshness and coverage vary
Live web search is current but mixes sources of very different quality; Perplexity labels some cited domains, such as government or academic sites, and says the labels are not endorsements. Academic indexes lag publication: Elicit updates its corpus weekly, and Consensus notes that papers from the last few weeks may be missing. Gemini Notebook keeps Google Drive sources in sync but treats other uploads as fixed copies, so re-add a file after it changes. Paywalled full text limits every tool here.
Research APIs and agents are building blocks, not reading tools
Exa Agent is an asynchronous API: you describe the data and the JSON shape you want, and it searches, reads, and returns cited, structured results, priced per run. You.com now leads with web search, contents, answer, and research APIs plus an MCP server, and Perplexity sells a Search API and an Agent API with built-in citations. These suit developers adding research to their own products or pipelines. OpenScience is different again: an open-source (Apache 2.0) agent that reads papers, writes and runs analysis code on your files and compute, and records every step, with the model you choose.
Compare by sources, citations, documents, and freshness
Seven tools that cover the main kinds of research in this category, using what each vendor publishes on its own site, checked on October 20, 2026. We have not run the same research question through every tool.
- What it searches
- The live web, for each question
- Citations and evidence
- Numbered citations linking to sources; some domains labeled government, academic, or trusted
- Your own documents
- File uploads (limited on the free plan)
- Freshness
- Real-time web search
- Plans
- Free plan; Pro, Max, and Enterprise Pro; Search API at $5 per 1,000 requests
- What it searches
- 138M+ papers from Semantic Scholar, PubMed, and OpenAlex, including preprints, plus ClinicalTrials.gov
- Citations and evidence
- Sentence-level citations; uses title and abstract when full text is unavailable
- Your own documents
- Research Agent can draw on uploaded documents; custom extraction from uploaded papers on Pro
- Freshness
- Corpus updated weekly
- Plans
- Free Basic plan; Plus from $11/user/mo billed annually; Pro, Scale, and Enterprise
- What it searches
- Academic papers from Semantic Scholar, OpenAlex, PubMed, and publisher feeds; preprints included and tagged
- Citations and evidence
- Each claim links to its source paper; Consensus notes its summaries are still LLM-generated
- Your own documents
- Built around its paper index
- Freshness
- Updated continuously; the newest few weeks of papers may be missing
- Plans
- Free plan; Pro, Team, and Enterprise; REST API and MCP server
- What it searches
- 300M+ articles, preprints, books, patents, and datasets
- Citations and evidence
- Classifies citing statements as supporting, contrasting, or mentioning
- Your own documents
- Reference Check: upload a manuscript PDF to see how its references have been cited and flag retractions
- Freshness
- Collections alert you to new supporting or contrasting citations and retractions
- Plans
- No free plan; 7-day trial; Basic $12/mo billed yearly
- What it searches
- The document you upload; may search the web for related work while reviewing
- Citations and evidence
- A written review of your document, not cited answers; checks references against existing work
- Your own documents
- Upload a PDF or text, or import from Google Drive; stored up to a year, not used for training unless you opt in
- Freshness
- Not a search index; a review typically takes 10 to 30 minutes
- Plans
- Two free reviews a week; then your own Gemini API key at standard API rates; REST API
- What it searches
- Only the sources you add; Fast Research and Deep Research can find web sources to import
- Citations and evidence
- Answers cite passages in your sources
- Your own documents
- PDFs, Google Docs and Slides, Word, web pages, YouTube videos with captions, audio, and images; 50 sources per notebook free, up to 300 on Pro
- Freshness
- Google Drive sources sync; other uploads are fixed copies
- Plans
- Free; higher limits with Google AI plans
- What it searches
- Exa's own web index, searched per request
- Citations and evidence
- Schema-validated JSON results with web citations
- Your own documents
- None needed: you describe the data you want back
- Freshness
- Searches at run time
- Plans
- $10 of free credits a month; $0.012–$1.00 per run
| Tool | What it searches | Citations and evidence | Your own documents | Freshness | Plans |
|---|---|---|---|---|---|
| Perplexity | The live web, for each question | Numbered citations linking to sources; some domains labeled government, academic, or trusted | File uploads (limited on the free plan) | Real-time web search | Free plan; Pro, Max, and Enterprise Pro; Search API at $5 per 1,000 requests |
| Elicit | 138M+ papers from Semantic Scholar, PubMed, and OpenAlex, including preprints, plus ClinicalTrials.gov | Sentence-level citations; uses title and abstract when full text is unavailable | Research Agent can draw on uploaded documents; custom extraction from uploaded papers on Pro | Corpus updated weekly | Free Basic plan; Plus from $11/user/mo billed annually; Pro, Scale, and Enterprise |
| Consensus | Academic papers from Semantic Scholar, OpenAlex, PubMed, and publisher feeds; preprints included and tagged | Each claim links to its source paper; Consensus notes its summaries are still LLM-generated | Built around its paper index | Updated continuously; the newest few weeks of papers may be missing | Free plan; Pro, Team, and Enterprise; REST API and MCP server |
| Scite | 300M+ articles, preprints, books, patents, and datasets | Classifies citing statements as supporting, contrasting, or mentioning | Reference Check: upload a manuscript PDF to see how its references have been cited and flag retractions | Collections alert you to new supporting or contrasting citations and retractions | No free plan; 7-day trial; Basic $12/mo billed yearly |
| Deep Review | The document you upload; may search the web for related work while reviewing | A written review of your document, not cited answers; checks references against existing work | Upload a PDF or text, or import from Google Drive; stored up to a year, not used for training unless you opt in | Not a search index; a review typically takes 10 to 30 minutes | Two free reviews a week; then your own Gemini API key at standard API rates; REST API |
| Gemini Notebook (formerly NotebookLM) | Only the sources you add; Fast Research and Deep Research can find web sources to import | Answers cite passages in your sources | PDFs, Google Docs and Slides, Word, web pages, YouTube videos with captions, audio, and images; 50 sources per notebook free, up to 300 on Pro | Google Drive sources sync; other uploads are fixed copies | Free; higher limits with Google AI plans |
| Exa Agent | Exa's own web index, searched per request | Schema-validated JSON results with web citations | None needed: you describe the data you want back | Searches at run time | $10 of free credits a month; $0.012–$1.00 per run |
Prices are the vendors' published figures in USD. Editorial comparison, not a ranking.
Common questions about research tools
What is the difference between Gemini Notebook (NotebookLM) and Perplexity?
Gemini Notebook, formerly NotebookLM, answers only from the sources in your notebook, though its Fast Research and Deep Research features can find web sources to add. Perplexity searches the live web for every question. Use Gemini Notebook when you have a specific set of documents to analyse; use Perplexity when you need to find and synthesise information from across the web. Full comparison →
What is the difference between Perplexity and Elicit?
Perplexity searches the live web and suits current information, quick lookups, and broad research. Elicit searches academic papers, including preprints, cites them sentence by sentence, and extracts structured data across studies for literature and systematic reviews. They answer different kinds of questions.
Do Elicit and Consensus only search peer-reviewed papers?
No. Elicit includes preprints from arXiv, bioRxiv, medRxiv, and SSRN alongside journal articles and conference papers. Consensus includes preprints by default and tags them in results. Both are useful starting points for academic research, but check whether a paper has been peer reviewed, and read it, before you cite it. Compare Consensus and Elicit →
Which tool helps me check whether a finding holds up?
Scite, for published findings. For papers it covers, it shows how later work cites a finding, classified as supporting, contrasting, or mentioning, and its Reference Check flags how the references in your own manuscript have been cited, including retractions. To check the reasoning of your own draft before submission, Google Research's Deep Review reviews the document itself for logical and mathematical problems and unsupported claims. Both complement a search tool such as Elicit or Consensus rather than replacing one. See Scite · See Deep Review →
Can I trust AI research tools for formal writing?
Use them to find and triage sources, not to replace reading. A citation shows where a claim came from, not that the summary is accurate, and tools without full-text access may be working from abstracts. Verify claims against the original source before citing them in formal or academic work.
Do all the tools in this category cite their sources?
The search and question-answering tools do: Perplexity, Elicit, Consensus, Gemini Notebook, and the Exa Agent and You.com research APIs return citations with their answers. OpenScience records each step it takes, Deep Review returns a critique of your own document rather than cited answers, and OpenMAIC generates lessons. Source quality still varies by tool and question.
What are research APIs, and who are they for?
They are for developers adding search or research to their own product or data pipeline. Exa Agent takes a description of the data you want and returns structured, cited results, priced per run; You.com and Perplexity sell web search and answer APIs. If you want to read and evaluate research yourself, a search tool such as Perplexity, Elicit, or Consensus is the better fit. See Exa Agent →
Related
- Consensus vs Elicit: two academic search tools compared
Quick evidence answers vs structured extraction for literature reviews.
- Gemini Notebook (NotebookLM) vs Perplexity
Answering from your own documents vs searching the live web.
- Browse AI chat assistants
General assistants such as ChatGPT, Claude, and Gemini also search the web, with less focus on sources.
Vendor facts in this guide last checked October 20, 2026 against: How Perplexity works, Perplexity plans, Perplexity API pricing, Elicit's sources for papers, Elicit pricing, Consensus (llms.txt), Scite features, Scite pricing, Gemini Notebook rename, Gemini Notebook sources, Gemini Notebook limits, Exa pricing, You.com API pricing, OpenScience, Deep Review, Deep Review launch. Picks and tradeoffs are editorial judgments.