Perplexity AI is a search and research tool built around a simple idea: instead of returning a page of blue links, it reads the web for you and answers your question directly, with citations attached. It works for anyone doing quick fact-checking, market research, or deep-dive reading, from students and journalists to founders trying to get up to speed on a new market fast.
What does Perplexity AI do?
Perplexity AI combines a search index with large language models to produce direct answers rather than a results page. Type a question and it retrieves current web sources, synthesizes them into a written response, and links back to where each claim came from, so you can verify anything that matters.
Beyond basic search, Perplexity offers Focus modes that narrow retrieval to academic papers, Reddit discussions, or specific domains, plus a Deep Research mode that runs multi-step searches and produces a longer, structured report on a topic. It also ships Comet, its own AI-powered web browser, and Sonar, an API that lets developers build the same search-and-cite capability into their own products.
Core features
- Real-time web search paired with an AI-written summary and inline source citations.
- Focus modes that limit results to academic sources, Reddit, YouTube, or a set of chosen websites.
- Deep Research mode that runs longer, multi-step investigations and returns a full written report.
- File and image upload so you can ask questions about a PDF, spreadsheet, or photo.
- Threaded follow-up questions that keep context from earlier turns in the same search.
- Comet, a standalone browser that layers Perplexity's search and summarization into everyday browsing.
- Sonar API access for developers who want to add cited, real-time search to their own applications.
Use cases
Perplexity is a strong fit for anyone who needs an answer fast and wants to know where it came from. Analysts and founders use it to scan a new industry or competitor set in minutes, journalists use it to pull together background before an interview, and students use it to get a sourced starting point for a paper instead of skimming ten separate tabs.
- Competitive and market research that needs current data, not a model's training cutoff.
- Fact-checking a claim or statistic before it goes into a report or article.
- Summarizing a long PDF or dataset by uploading it directly into a search thread.
- Building AI-powered search into a product using the Sonar API.
Pricing
Perplexity offers a free plan that covers standard search and a limited number of Pro-level queries. Perplexity Pro is a paid monthly or annual subscription that unlocks unlimited use of the more advanced models, extended Deep Research, higher file upload limits, and deeper source access. Business and Enterprise tiers add team seats, admin controls, and higher usage limits, with pricing available through Perplexity's sales team. The Sonar API is billed separately, based on usage.
How to use Perplexity AI
- Go to perplexity.ai and create a free account, or sign in with Google.
- Type a question into the search bar the way you would ask a knowledgeable colleague.
- Pick a Focus mode if you want to narrow the search to academic sources, Reddit, or a specific site.
- Review the answer and click through the numbered citations to check the original sources.
- Ask a follow-up question in the same thread to dig deeper without starting over.
- Upgrade to Pro if you need Deep Research, more advanced models, or higher upload limits.
Frequently asked questions
Is Perplexity AI free to use?
Yes. Perplexity has a free plan that supports everyday search and a limited number of advanced queries per day. A paid Pro subscription removes those limits and adds features like Deep Research and higher file upload caps.
How is Perplexity different from a regular search engine?
A traditional search engine returns a list of links you have to click through and read yourself. Perplexity reads the relevant pages and writes a direct answer, with numbered citations so you can trace each fact back to its source.
Can Perplexity answer questions about my own documents?
Yes. You can upload a PDF, spreadsheet, or image into a search thread and ask questions about its contents, which is useful for summarizing reports or pulling data out of a long document.
Does Perplexity have an API for developers?
Yes. Perplexity's Sonar API lets developers add real-time, cited web search to their own applications, and it is billed separately from the consumer Pro subscription.
Learn more at Perplexity AI.