Best AI Search Engines
Compare 21 AI Search tools by verified monthly pricing, free plans, and features.
AI search engines answer questions with synthesized, cited responses instead of a list of links, combining live web results with language models.
ToolScanner currently tracks 21 AI Search tools. 20 of them offer a real free plan, so you can start without paying. 1 offer a free trial. Verified paid plans start from $5 per month on a monthly-billing basis.
When you compare options, the factors that usually matter are: Source citations you can check, Freshness of results, Privacy and data handling, Price and free plan (monthly-billing basis).
Every tool below has a detail page with verified pricing. You can compare any two side by side, or use AI Finder and the stack builder to plan a full setup within your budget.
Category snapshot
Featured tools
AI answer engine with cited, up-to-date sources.
Best for Research questions that need cited sources
Google's AI research assistant that summarizes and answers questions from your own documents.
AI search engine that answers questions using findings from research papers.
AI research assistant for finding, summarizing, and extracting data from papers.
Search and content-extraction API for building AI agents and LLM applications.
Upload a PDF and ask questions or get a summary from an AI chat.
How to choose
What matters most depends on your use case. For AI Search tools, weigh these factors:
- Source citations you can check
- Freshness of results
- Privacy and data handling
- Price and free plan (monthly-billing basis)
Free options
AI answer engine with cited, up-to-date sources.
Best for Research questions that need cited sources
Google's AI research assistant that summarizes and answers questions from your own documents.
AI search engine that answers questions using findings from research papers.
AI research assistant for finding, summarizing, and extracting data from papers.
Search and content-extraction API for building AI agents and LLM applications.
Upload a PDF and ask questions or get a summary from an AI chat.
Best for…
Related comparisons
All 21 tools
AI answer engine with cited, up-to-date sources.
Best for Research questions that need cited sources
Google's AI research assistant that summarizes and answers questions from your own documents.
AI search engine that answers questions using findings from research papers.
AI research assistant for finding, summarizing, and extracting data from papers.
Search and content-extraction API for building AI agents and LLM applications.
Upload a PDF and ask questions or get a summary from an AI chat.
AI tool that summarizes academic papers and articles.
Free AI-powered academic search engine for research papers.
AI tool that shows how academic papers are cited by later research.
AI-powered tool for discovering and mapping related academic papers.
Ad-free, subscription search engine with AI-assisted answers.
AI-powered search engine with a conversational answer format.
AI search agent that generates custom answer pages for queries.
AI-native search engine and API built for retrieving web content.
Multilingual AI search engine that answers with sources and can turn results into mind maps and presentations.
Best for multilingual AI answer engine
AI search and research assistant emphasizing reliable, citation-backed answers, with highlighting across web and PDFs.
Best for research with trusted citations
AI research agent that performs deep, systematic searches of scientific literature, mimicking how a careful human researcher works.
AI platform for academic research: search papers, chat with PDFs, run literature reviews, and draft with citations.
Visual tool that builds a graph of related academic papers from one seed paper, making literature discovery intuitive.
Best for visual map of related papers
AI-native browser from The Browser Company where you chat with your tabs and automate browsing with skills.
Perplexity's AI browser, with an assistant that can read your tabs and carry out browsing tasks. Free on web, desktop and mobile.
Frequently asked questions
What are AI Search tools?
AI search engines answer questions with synthesized, cited responses instead of a list of links, combining live web results with language models. ToolScanner currently tracks 21 AI Search tools.
Are there free AI Search tools?
Yes — Perplexity, NotebookLM, Consensus, Elicit offer a verified free plan.
How do I choose a AI Search tool?
Start from your use case, then compare: Source citations you can check, Freshness of results, Privacy and data handling, Price and free plan (monthly-billing basis). Prices on ToolScanner are verified on a monthly-billing basis, so you're comparing like for like.
Which AI Search tools offer an API?
Based on recorded platform data: Perplexity, Exa.
How much do AI Search tools cost?
Verified paid plans in this category start from $5 per month, and 20 tools offer a free plan. Several tools use usage-based or quote-based pricing — check each detail page.
Can I compare AI Search tools side by side?
Yes — select any tools for an interactive side-by-side comparison, start from a curated comparison page, or let AI Finder shortlist tools by budget and use case.