An AI search engine should answer the question and show where the answer came from. Beyond that, decide whether you want to replace Google outright, search a specialist corpus like scientific papers, or follow live news.
Perplexity is the best AI search engine: Free gives unlimited Quick searches and 5 Pro searches a day, with citations on every answer. Kagi Professional ($10/mo) replaces Google with unlimited ad-free search and bundles an AI assistant. For peer-reviewed answers, use Consensus.
| App | Free tier | Paid from | Top plan | Best for |
|---|---|---|---|---|
| Perplexity | Yes | $20/mo | $200/mo | Research with verifiable sources, fact-checking, exploring unfamiliar topics |
| Kagi Assistant | No | $5/mo | $25/mo | Privacy-minded users who want to replace both Google and a ChatGPT-style subscription with one bundle |
| Consensus | Yes | $20/mo | $65/mo | Students, academics and clinicians who need evidence-backed answers with citations to peer-reviewed studies |
| Grok | Yes | $30–40/mo | $300/mo | Current events, X/Twitter integration, less-filtered responses |
| Mistral Vibe | Yes | $14.99/mo | $24.99/mo | Users who want a privacy-conscious European alternative to ChatGPT/Claude with all-day agentic coding built in |
Monthly prices in US dollars before tax, from each vendor's official pricing (US list price; weekly-billed plans converted to a monthly figure). Updated November 2, 2026
Search-first AI where every answer comes with citations to sources. Free includes unlimited Quick searches and 5 Pro searches a day; Pro ($20/mo) raises that to 300+ Pro searches a day with GPT-5.6, Claude Sonnet 5 and Sonar 2.
Pick it if: you want cited answers instead of a page of links.
Where it falls short: Less suited to creative writing or open-ended chat.
Full Perplexity pricing →A paid, ad-free search engine bundled with Kagi Assistant, a multi-model AI chat, in one plan. Professional ($10/mo) includes unlimited searches; Ultimate adds Research mode and flagship models.
Pick it if: you care about privacy and want one bill for search and AI chat.
Where it falls short: AI usage is capped at your plan's dollar value in tokens, flagship models need Ultimate, and prices exclude sales tax.
Full Kagi Assistant pricing →Searches 250M+ peer-reviewed papers and answers with citations to the studies. Free includes basic paper search, 10 Pro messages and 3 Deep reviews a month; Pro ($20/mo) makes Pro messages unlimited.
Pick it if: you need evidence from studies, not web pages.
Where it falls short: It only answers from scientific literature, not as a general chatbot.
Full Consensus pricing →Native to X, with real-time search and access to the timeline even on the free tier; SuperGrok adds Deep search and higher limits.
Pick it if: you follow breaking news and what people on X are saying about it.
Where it falls short: Free is limited to 2 prompts every 2 hours, and quality is inconsistent next to frontier models.
Full Grok pricing →Mistral's assistant includes web searches on Free and expanded web search limits on Pro ($14.99/mo), from a Paris-based lab positioned as a privacy-conscious alternative to ChatGPT and Claude.
Pick it if: you prefer a European provider.
Where it falls short: Free-tier message and search limits aren't published as exact numbers.
Full Mistral Vibe pricing →An AI summary can misread the page it cites. For anything you'll act on, open the source: Perplexity attaches citations to every answer and Consensus links to the studies behind its answers, which makes that check quick.
Yes. Free includes unlimited Quick searches and 5 Pro searches a day. Pro raises Pro searches to 300+ a day and adds unlimited file uploads and image generation.
Kagi if you want to replace your default search engine with ad-free results and get an AI assistant in the same plan. Perplexity if you mainly want cited answers and a usable free tier.
How we choose: prices come from each vendor's official pricing page and are re-checked every week. We take no affiliate fees, so rankings aren't for sale.