Best AI Search Engines & Research Tools (2027)
AI search engines and research assistants answer questions with cited sources, search academic papers and summarise long documents so you can learn faster. These are the 86 best AI search engines in our AI tools directory, ranked by our editors — our top picks right now are Google Lens, Google Scholar, Kagi and OpenEvidence.
All 86 AI search engines, ranked
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1
Google LensFree
Search what you see with your camera
Google’s visual search that identifies objects, translates text, solves homework and finds products from photos or your screen.
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2
Google ScholarFree
Search engine for academic literature
Google’s free index of scholarly papers, theses and court opinions with citation tracking, author profiles and AI-powered Scholar Labs.
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3
KagiPaid
Ad-free premium search with AI
Paid, ad-free search engine with personalised results, quick AI answers and the Kagi Assistant for many LLMs.
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4
OpenEvidenceFree
AI medical search for clinicians
Free evidence-based answers for doctors, grounded in peer-reviewed medical literature with citations.
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5
Semantic ScholarFree
Free AI-powered research search
Allen Institute for AI’s free search engine (since 2015) for 200M+ papers, with TLDR summaries and a smart reader.
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6
TypesenseFreemium
Open-source search engine with vector search
Fast, typo-tolerant open-source search engine with vector and semantic search, conversational RAG and a hosted cloud.
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7
AlgoliaFreemium
AI search for websites & apps
Search and discovery API (since 2012) with NeuralSearch, recommendations and AI answers for sites and apps.
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8
AlphaSensePaid
Market intelligence with generative AI
Searches earnings calls, broker research, filings and expert calls with AI summaries for analysts and strategists.
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9
ChatGPT SearchFree
Web search inside ChatGPT
ChatGPT’s built-in web search that returns timely answers with source links for news, sports, prices and research.
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10
Connected PapersFreemium
Visual graphs of related papers
Builds a visual graph of papers similar to the one you enter, so you can explore a research field at a glance.
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11
ConsensusFreemium
AI search engine for science
Answers questions with evidence from 200M+ peer-reviewed papers, showing a 'Consensus Meter' of where the research agrees.
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12
ConstructorPaid
AI e-commerce search and discovery
AI search and recommendations platform used by big US retailers to rank products by shopper intent and business goals.
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13
ElasticFreemium
Search AI platform (Elasticsearch)
The company behind Elasticsearch, offering vector search, AI search and observability built on the open-source engine.
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14
ElicitFreemium
AI research assistant for papers
Searches 125M+ academic papers, summarises findings and extracts data into tables to speed up literature reviews.
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15
ExaFreemium
Web search API built for AI
Neural search engine and API that finds pages by meaning, used by AI apps and agents to fetch fresh, relevant web content.
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16
GleanPaid
Work AI and enterprise search
Searches across all your company apps and powers assistants and agents grounded in permission-aware company knowledge.
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17
Google AI ModeFree
Conversational AI search from Google
Google Search’s AI mode that breaks complex questions into sub-searches, shows cited answers and supports follow-ups, images and voice.
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18
Yandex Search with Alice AIFree
Russia’s top search engine with AI answers
Russia’s most-used search engine, now answering complex questions with Alice AI summaries drawn from multiple sources, alongside classic results.
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19
Azure AI SearchPay-per-use
Retrieval for AI apps on Azure
Microsoft’s search service with vector, hybrid and semantic ranking, widely used as the retrieval layer for RAG apps.
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20
BloomreachPaid
AI personalisation and product search
Commerce platform combining AI product search, merchandising, marketing automation and conversational shopping.
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21
Brave SearchFreemium
Private search with AI answers
Independent, privacy-first search engine with its own index, AI-generated answers with sources and the Leo assistant.
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22
Doximity GPTFree
Free AI assistant for US clinicians
The US physician network’s HIPAA-compliant AI that drafts letters, answers clinical questions with citations and speeds up paperwork.
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23
Fiscal.aiFreemium
AI stock research terminal
Formerly FinChat, a US investment-research platform with AI copilot, fundamentals, KPIs and transcripts for 100,000+ stocks.
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24
ResearchRabbitFree
Spotify for research papers
Free tool that recommends related papers and authors from your collections and maps citation networks.
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25
SciSpaceFreemium
AI research agent for science
Search 280M+ papers, chat with PDFs, run literature reviews and get explanations of maths and tables in plain language.
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26
ScitePaid
Smart citations for research
Shows whether papers support or contradict a claim using 1.2B+ classified citation statements, with an AI assistant.
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27
TavilyFreemium
Search API for AI agents
Real-time search and extraction API optimised for LLMs and agents, returning clean, relevant results.
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28
VespaFreemium
AI search platform at scale
Open-source engine, born at Yahoo, for large-scale vector, text and structured search plus recommendation and RAG.
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29
Ai2 AstaFree
AI research assistant for scientists
The Allen Institute for AI’s agent for finding papers, summarising literature and analysing data with transparent sources.
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30
Box AIPaid
AI for enterprise content
Box’s secure AI that answers questions, extracts data and runs agents across documents stored in Box.
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31
BrightwavePaid
AI research for investment professionals
AI research platform that reads filings, transcripts and news to produce cited investment analysis for funds and banks.
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32
FutureHouseFreemium
AI agents for scientific discovery
US non-profit lab whose AI scientist agents search literature, analyse data and propose hypotheses for biology research.
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33
Glass HealthFreemium
Clinical decision support AI
US clinical AI that drafts differential diagnoses, assessment plans and evidence-based answers for clinicians.
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34
GuruPaid
AI knowledge base for teams
Verified company knowledge base with AI answers in Slack, Teams and the browser, keeping information accurate.
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35
HebbiaPaid
AI for financial & legal research
Matrix-style AI that reads thousands of documents at once to answer complex questions for finance and legal teams.
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36
Jina AIFreemium
Search foundation models & APIs
Embeddings, rerankers, a Reader API that turns URLs into LLM-ready text, and DeepSearch for building search AI.
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37
LinerFreemium
AI research assistant with reliable sources
Answers research questions with citations from academic papers and trusted sites, plus a web highlighter.
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38
LitmapsFreemium
Literature maps & discovery
Visual citation maps that help you discover, track and share the research literature around a topic.
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39
ParallelPay-per-use
Web search infrastructure for AI agents
US company offering search, extract and deep-research APIs built for AI agents rather than humans.
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40
RecallFreemium
AI knowledge base for everything you read
Summarises articles, videos and podcasts and connects them into a personal knowledge graph you can chat with.
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41
TinEyeFreemium
Reverse image search engine
Toronto-made reverse image search that finds where an image appears online, with commercial APIs for brands and stock agencies.
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42
UndermindFreemium
Deep search for scientific papers
AI research agent that reads and ranks hundreds of papers to find exactly what you are looking for, like a human expert.
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43
Vane (Perplexica)Free
Open-source AI answering engine
Formerly Perplexica, a self-hosted open-source alternative to Perplexity that searches the web and answers with sources using local or cloud models.
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44
AnaraFreemium
AI research workspace (formerly Unriddle)
Chat with papers, notes and lectures, write with citations and organise sources in one research workspace.
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45
ChatDOCFreemium
AI chat for documents with citations
Reads PDFs, Word files and scanned documents, including tables, and answers questions with traceable sources.
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46
Copilot Search in BingFree
Microsoft’s AI answer search
Bing’s AI search mode that writes summarised, cited answers and lets you dig deeper with suggested follow-up questions.
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47
CoveoPaid
AI search & generative experiences
Enterprise AI search and relevance platform (founded 2005) for commerce, service and websites, with generative answers.
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48
DimensionsFreemium
Research database with AI insights
Linked database of publications, grants, patents and clinical trials with AI summaries and analytics.
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49
Duck.aiFree
DuckDuckGo’s private AI chat
Free, anonymous access to popular AI models from DuckDuckGo — chats aren’t used for training and aren’t tied to you.
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50
FeloFreemium
Multilingual AI search engine
AI search that answers in your language using global sources, and turns results into mind maps and slides.
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51
GlaspFree
Social web highlighter with AI
Highlight web pages and YouTube, get AI summaries and see what like-minded readers are learning.
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52
HumataFreemium
Chat with your PDFs and files
Ask questions about long PDFs and documents and get answers with highlighted citations from the source.
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53
LucidworksPaid
AI-powered search and product discovery
US enterprise search platform built on Solr with AI ranking, semantic search and generative answers for commerce and support.
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54
PatSnapPaid
AI for patents & R&D intelligence
Innovation intelligence platform with AI patent search, novelty checks and technology landscapes.
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55
Reddit AnswersFree
AI answers from Reddit conversations
Reddit’s AI search that summarises real discussions from communities into answers with links to the threads.
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56
SanaPaid
AI assistant for enterprise knowledge
Workday-owned AI assistant that searches across company tools, takes meeting notes and builds agents on your knowledge.
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57
ScholarAIFreemium
AI research assistant for papers
Searches and reads peer-reviewed literature, summarises full texts and answers questions with citations for students and clinicians.
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58
ScholarcyFreemium
Summarise research papers into flashcards
Turns long papers, reports and articles into summary flashcards with key findings, references and figures.
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59
Scopus AIPaid
Elsevier’s generative research assistant
Generative AI on top of Scopus’s curated abstract database, giving referenced summaries and concept maps.
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60
VectaraFreemium
Trusted RAG platform
RAG-as-a-service platform for building accurate AI assistants and agents with built-in hallucination detection.
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61
Web of Science Research AssistantPaid
AI assistant over Web of Science data
Clarivate’s generative AI that answers research questions and guides literature discovery using the trusted Web of Science citation index.
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62
YextPaid
AI search and brand visibility platform
US platform that manages business listings and knowledge for AI search engines and powers on-site AI search and chat.
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63
Amazon KendraPay-per-use
Intelligent enterprise search on AWS
AWS’s ML-powered search service that finds precise answers across company documents, wikis and databases.
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64
Amazon Q BusinessPaid
Enterprise knowledge assistant from AWS
AWS’s generative AI assistant that answers questions, summarises and builds apps from company data across 40+ connectors.
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65
Amazon RufusFree
AI shopping assistant in the Amazon app
Amazon’s generative AI shopping assistant that answers product questions, compares items and tracks deals inside the Amazon app.
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66
AnswerThisFreemium
AI literature review assistant
Generates literature reviews with real citations from 250M+ papers and manages your research library.
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67
AskYourPDFFreemium
Chat with any PDF
Upload PDFs or link documents to summarise, ask questions and generate notes, with plugins for chat apps.
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68
EightifyFreemium
YouTube video summaries
Browser extension that summarises YouTube videos into key ideas with timestamps in dozens of languages.
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69
ExplainpaperFreemium
Understand research papers easily
Upload a research paper and highlight confusing passages to get plain-language explanations and follow-up answers.
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70
KeeniousFreemium
Research recommendations from your writing
Analyses the document you are writing and recommends relevant papers, inside Word, Google Docs or the web.
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71
PaperguideFreemium
AI for scientific research & systematic reviews
Research assistant that answers questions from papers, runs systematic reviews and helps you read and write with references.
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72
R DiscoveryFreemium
Personalised research paper feed
App that recommends new papers daily from 250M+ articles, with audio summaries and translations.
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73
RogoPaid
AI analyst for investment banks
Generative AI platform built for bankers and investors, researching companies and drafting analysis from financial data.
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74
STORMFree
Stanford’s AI that writes cited reports
Research prototype from Stanford that researches a topic across the web and writes a Wikipedia-style article with citations.
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75
AndiFree
Conversational AI search
Free, ad-free search assistant that answers questions in plain language with visual results and sources.
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76
BearlyFreemium
AI for reading, writing and research
Desktop and web app that summarises articles and PDFs, chats with documents and helps you write with several models.
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77
iAsk.aiFree
Free AI answer engine
Free AI search engine that gives detailed, sourced answers to factual and academic questions without sign-up.
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78
Iris.aiPaid
AI engine for scientific text
Research platform that maps, filters and extracts data from scientific literature for R&D teams.
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79
KomoFreemium
AI search engine for answers & exploration
AI search engine with an ad-free answer mode, topic exploration and community insights alongside web results.
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80
LogicallyFreemium
Research, cite and write with AI (formerly Afforai)
Research assistant (formerly Afforai) that finds sources, chats with your papers and helps you write with accurate citations.
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81
MorphicFree
Open-source AI answer engine
Open-source, Perplexity-style answer engine with generative UI that you can use online or self-host.
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82
Paper DigestFree
Summaries of the latest research
Free service that digests new papers and conferences into short highlights and lets you query research trends.
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83
SourcelyFreemium
Find academic sources with AI
Paste your essay or topic and Sourcely suggests relevant academic sources with summaries and ready citations.
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84
TLDR ThisFreemium
Summarise any article or document
Turns articles, papers and documents into short key-point summaries, with a browser extension.
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85
UpwordFreemium
AI research and summary assistant
Summarises articles, PDFs and videos and organises them into research projects with cited notes.
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86
WaldoFreemium
AI search for professional research
Search tool for strategists and analysts that pulls insights and sources together into structured research.
Best AI Search Engines & Research Tools — FAQ
What is the best AI research tool in 2027?
Google Lens is our top-rated AI research tool right now (4.6/5), followed by Google Scholar and Kagi. The best choice depends on your use case — compare features and pricing in the list above.
Are there free AI search engines?
Yes — 63 of the 86 AI search engines on this list are free or have a free plan, including Google Lens, Google Scholar, OpenEvidence and Semantic Scholar. See every one on our free AI tools list.
How does ZORGO AI rank AI search engines?
Every tool is reviewed and rated out of 5 by a human editor for quality, usefulness and reliability, then ranked by rating and popularity. Paid placements are labelled “Sponsored” and editor ratings are never for sale.