Best Research AI Tools in 2025
AI research assistants, summarizers, and knowledge tools
1 Tools RankedLast updated: February 2026
Complete Rankings
PerplexityFeatured
AI-powered search engine
AI searchCitationsReal-time infoFollow-up questions
Ask anything. Get instant answers with cited sources. AI search that understands you.
Free / $20/mo
456 upvotes