14 Best Free AI Search & Research Tools (2026)
These 14 AI Search & Research Tools let you start without paying: each has a free plan, is completely free, or is open source.
Quick comparison
| # | Tool | Score | Pricing | Available on |
|---|---|---|---|---|
| 1 | Perplexity | No reviews yet | Free plan + paid plans | Web, iOS, Android, macOS, Windows |
| 2 | You.com | No reviews yet | Free plan + paid plans | Web, iOS, Android |
| 3 | NotebookLM | No reviews yet | Free plan + paid plans | Web, iOS, Android |
| 4 | Consensus | No reviews yet | Free plan + paid plans | Web |
| 5 | Elicit | No reviews yet | Free plan + paid plans | Web |
| 6 | Semantic Scholar | No reviews yet | Free | Web, API |
| 7 | SciSpace | No reviews yet | Free plan + paid plans | Web, Chrome extension |
| 8 | Paperpal | No reviews yet | Free plan + paid plans | Web, Microsoft Word |
| 9 | Humata | No reviews yet | Free plan + paid plans | Web |
| 10 | ChatPDF | No reviews yet | Free plan + paid plans | Web |
| 11 | Felo | No reviews yet | Free plan + paid plans | Web, iOS, Android, Chrome extension |
| 12 | Undermind | No reviews yet | Free plan + paid plans | Web |
| 13 | Julius AI | No reviews yet | Free plan + paid plans | Web, iOS |
| 14 | Litmaps | No reviews yet | Free plan + paid plans | Web |
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1
Perplexity
No reviews yet Free plan + paid plans
AI answer engine that searches the web and cites its sources.
- Answers with cited sources
- Deep research reports
- Follow-up questions
- File and image analysis
Best for: Researchers and students, Professionals checking facts, People who want sources with answers
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2
You.com
No reviews yet Free plan + paid plans
AI search and research assistant with cited answers.
- Cited AI answers
- Research mode
- Choice of AI models
- Custom agents
Best for: Researchers, Businesses needing AI search, Developers
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3
NotebookLM
No reviews yet Free plan + paid plans
Google's research notebook that answers questions from your own sources.
- Answers grounded in your sources
- Citations to exact passages
- Audio Overviews
- Study guides and mind maps
Best for: Students, Researchers, Professionals digesting documents
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4
Consensus
No reviews yet Free plan + paid plans
Searches scientific papers and summarises what the research says.
- Search across peer-reviewed papers
- Summaries of findings
- Consensus meter
- Study quality signals
Best for: Students, Healthcare professionals, Researchers
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5
Elicit
No reviews yet Free plan + paid plans
AI research assistant for finding and analysing academic papers.
- Find relevant papers
- Summaries of studies
- Data extraction into tables
- Research reports
Best for: Academic researchers, Graduate students, Policy and health analysts
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6
Semantic Scholar
No reviews yet Free
Free AI-powered search engine for scientific literature.
- Free search of scientific papers
- TLDR paper summaries
- Citation graphs
- Semantic Reader
Best for: Researchers, Students, Developers building research tools
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7
SciSpace
No reviews yet Free plan + paid plans
AI assistant for reading, writing and searching research papers.
- Explains papers in plain language
- Literature review assistant
- Academic search
- AI writing and paraphrasing
Best for: Students reading papers, Early-career researchers, Literature reviews
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8
Paperpal
No reviews yet Free plan + paid plans
AI writing and language help for academic researchers.
- Academic grammar and language checks
- Rephrasing and trimming
- Literature search with citations
- Plagiarism check
Best for: Researchers writing papers, PhD students, Non-native English academics
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9
Humata
No reviews yet Free plan + paid plans
Ask questions of your PDFs and documents.
- Ask questions about PDFs
- Answers with page citations
- Summaries
- Compare documents
Best for: Students, Researchers, Teams with long reports
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10
ChatPDF
No reviews yet Free plan + paid plans
Chat with any PDF to get answers and summaries.
- Chat with any PDF
- Page references in answers
- Summaries
- Multilingual support
Best for: Students, Professionals reading reports, Quick document questions
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11
Felo
No reviews yet Free plan + paid plans
Multilingual AI search engine with research and slide tools.
- AI search with sources
- Cross-language search
- Mind maps from results
- AI slide generation
Best for: Multilingual researchers, Students, Professionals preparing presentations
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12
Undermind
No reviews yet Free plan + paid plans
Deep research agent for scientific literature.
- Deep searches for specific research questions
- Reads and ranks papers
- Explanations of relevance
- Coverage estimates
Best for: Academic researchers, PhD students, R&D teams
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13
Julius AI
No reviews yet Free plan + paid plans
Analyse data and make charts by chatting with your spreadsheets.
- Chat with spreadsheets and data
- Charts and visualisations
- Statistical analysis
- Data cleaning
Best for: Business analysts, Students, Researchers without coding skills
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14
Litmaps
No reviews yet Free plan + paid plans
Visual literature maps for discovering related research.
- Visual citation maps
- Discover related papers
- New publication alerts
- Shareable maps
Best for: Graduate students, Researchers, Literature reviews
Questions
What are the best Free AI Search & Research Tools?
Based on customer scores on TrustKite, the top picks right now are Perplexity, You.com and NotebookLM. The order updates automatically as new reviews come in.
How is this list ranked?
Tools are ordered by their TrustKite score, which comes only from published customer reviews and is adjusted so a single review cannot put a new tool on top. Tools without reviews yet are listed by how widely used they are. No company can pay to be included or to rank higher.