What Is Perplexity AI? A Guide to the AI Search Engine Everyone's Talking About
Perplexity started as an AI alternative to Google search. It's since grown into its own browser, landed on Samsung phones at the operating-system level, and built a genuinely different approach to answering questions: showing its sources, every time.
Most AI assistants generate an answer and let you decide whether to trust it. Perplexity's core idea from the start has been the opposite: treat itself as an "answer engine" rather than a chatbot, reading a large number of live sources for a given question and citing them directly in its response, so you can click through and verify anything before relying on it.
That single design choice has carried it a long way — the platform now reports well over 100 million monthly active users across its products, and it's expanded well beyond a simple search box.
What Perplexity actually does
- Search with citations. Ask a question and get a written answer with sources linked directly in the response — the core feature the whole product is built around.
- Pro Search. A deeper research mode that reads across a large number of sources per query, aimed at more thorough questions than a quick lookup.
- Deep Research. A mode built for genuinely in-depth topics, taking more time to investigate a question thoroughly rather than answering instantly.
- Model Council. A feature that lets paid users ask one question and see answers from several different frontier AI models side by side, then pick the best response rather than being locked into one model's take.
- Comet, its own browser. Perplexity built a free agentic browser that can take actions on your behalf while you browse, not just answer questions in a separate tab.
Where it shows up beyond its own app
Perplexity has moved into places you might not expect an AI search tool to reach. It secured operating-system-level access on Samsung's Galaxy S26 — notably, the first company other than Google to get that kind of integration — and its underlying search infrastructure now powers AI features across a large number of Samsung devices. It's also been integrated into other platforms' search features beyond its own products.
Pricing, in general terms
Perplexity offers a free tier alongside paid Pro and Max subscription tiers, with higher tiers unlocking features like Model Council and deeper research capabilities. Check Perplexity's official pricing page directly for current numbers, since pricing and included features shift as the product evolves.
Something worth knowing before you rely on it heavily
Perplexity is currently facing copyright-related legal challenges from several news publishers over how its search results use their content — an ongoing, unresolved dispute as of this writing. This doesn't necessarily affect whether the tool is useful day-to-day, but it's a relevant piece of context for a tool whose entire value proposition is built around sourcing and citing content responsibly.
Who actually benefits from using it
- Students and researchers who need to verify claims and trace them back to a real source — see our guide to free AI tools for students for how this fits alongside other tools in a semester workflow.
- Anyone fact-checking fast-moving or current topics where a general chatbot's training data may already be outdated.
- Competitive or market research where pulling together and citing multiple sources on a topic quickly matters more than open-ended conversation.
Frequently asked questions
Is Perplexity free to use?
Yes, it has a free tier, alongside paid Pro and Max tiers that unlock deeper research modes and access to compare multiple AI models at once.
How is Perplexity different from just using Google?
Traditional search returns a list of links for you to read yourself. Perplexity reads across sources and writes a direct answer with citations built in, aimed at getting you to a verified answer faster, though checking the actual cited sources is still worthwhile for anything important.
Do I need the paid version to get cited sources?
No — citing sources is a core part of Perplexity's free tier, not a paid-only feature. Paid tiers add deeper research modes and access to compare multiple AI models, rather than gating citations themselves.