Perplexity, AI search engine

What is Perplexity?

Perplexity is an AI search engine. You ask a question in plain English, and instead of returning a list of blue links, it searches the web in real time, reads the relevant pages, and writes you a direct answer — with every source cited inline so you can verify exactly where each claim came from.

Under the hood it uses large language models (GPT-4o, Claude, and others depending on your plan) wrapped in a live search layer. This means it's much less likely to hallucinate outdated facts than a standalone AI assistant, and much faster to use than traditional web research.

Free vs Pro

The free tier is genuinely useful for most research tasks. Pro is worth it if you do serious research daily or need the Deep Research report feature.

The magic moment

Type: "What are the main arguments for and against rent control in major cities?"

Perplexity returns a balanced, structured answer with numbered citations — [1] The Economist, [2] Harvard Urban Study, [3] NY Times — each one a real source you can click to verify. What would be 20 minutes of reading conflicting articles becomes a 20-second summary you can actually trust.

That credibility — answers you can check — is what makes Perplexity different from ChatGPT.

Step-by-step setup

1. Go to perplexity.ai — no account needed to search
2. Type your question and press Enter
3. Read the answer and click any numbered citation to view the original source
4. Use the follow-up box below the answer to dig deeper — Perplexity holds the conversation context
5. Click the Focus selector to target specific sources: Web, Academic, YouTube, Reddit, or News
6. Optional: create a free account to save search history
7. Optional: upgrade to Pro for Deep Research, file uploads, and model choice

iOS and Android apps mirror the full web experience.

Features worth knowing

Focus modes let you restrict where Perplexity searches:

• Academic — peer-reviewed papers (great for scientific questions)
• YouTube — finds and summarises relevant videos
• Reddit — community discussions and lived experience
• News — recent articles only, good for fast-moving topics

Deep Research (Pro) — Perplexity breaks your question into sub-questions, runs multiple searches, reads dozens of sources, and compiles a structured multi-page report. Takes a few minutes but produces a genuinely useful briefing document.

Follow-up questions — after your first answer, ask "Can you go deeper on the counterarguments?" and it builds on the prior search without you re-explaining context.

When to use Perplexity vs other tools

Use Perplexity when accuracy, recency, and sources matter. Use ChatGPT or Claude when you need to write, create, or reason through a complex problem rather than research a factual one.