Perplexity

Perplexity is the AI-powered answer engine: it delivers direct, summarized answers to your queries, citing real-time web sources for immediate verification.

Perplexity redefines search. Founded in 2022 by Aravind Srinivas, Denis Yarats, Johnny Ho, and Andy Konwinski, the platform functions as an intelligent research assistant, not a traditional link aggregator. It utilizes large language models and real-time web indexing to synthesize comprehensive, conversational responses. Every answer includes verifiable inline citations, ensuring transparency and trust. The free version offers core answer-engine capabilities; the Pro tier unlocks advanced features (Deep Research, file uploads) and access to leading LLMs (like GPT-4 and Claude), providing a powerful tool for deep professional research.

https://perplexity.ai