Perplexity does one thing very well: it answers questions with sources. Every response shows numbered citations you can click to verify, which makes it genuinely more useful than a general chatbot for research, fact-checking, or competitive intelligence. The real-time web index is a core feature, not an add-on.
The free tier is meaningful for casual use, but the 5 daily Pro query limit is tight if you rely on it for work. At $20/mo, Pro unlocks unlimited advanced queries, model switching between GPT-5.5, Claude, and Gemini, and 300 monthly AI reports. If research and sourced answers are your primary use case, this is the best tool for it. If you need a general-purpose AI companion, the others fit better.