Perplexity AI is a research assistant that gives you sourced, cited answers — every claim gets a numbered footnote you can click straight through to the original page. That design choice is deliberate: rather than summarizing from memory (and quietly getting things wrong), Perplexity pulls from live web results on every query. The tradeoff is a four-tier pricing structure spanning free to $200 a month, and understanding where each tier draws its lines matters before you hand over a credit card.
Key Features
- Every answer includes numbered inline citations linking to real source pages — so you can verify anything it tells you in one click, rather than wondering where the information came from.
- Focus modes (Academic, Reddit, YouTube, Writing, Math, and All) let you restrict results to specific source types, which means an academic search actually pulls from scholarly papers rather than random blog posts.
- Deep Research automatically runs multiple rounds of searching, reading, and synthesis — producing a structured, multi-section report on complex topics instead of a single short paragraph.
- Spaces are persistent research workspaces where you can upload documents, set standing instructions for the AI, and share the entire environment with collaborators — built for ongoing projects, not just one-off questions.
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Why You'll Love Perplexity AI
Cited answers that are actually traceable
Most AI assistants give you a confident-sounding paragraph and leave you to figure out whether any of it is true. Perplexity takes the opposite approach: every sentence in its response is tied to a numbered source, and clicking that number opens the original article, study, or page in a new tab. That's not just a nice touch for academics — it's what makes Perplexity practically useful for anything where being wrong has consequences. Medical questions, financial research, legal definitions, recent events: once you can see exactly where an answer came from, you can judge whether to trust it. No other mainstream AI assistant makes that as frictionless as Perplexity does.
Deep Research: a multi-round report, not just a search
Standard queries return a sourced answer in seconds. Deep Research is a different mode entirely — Perplexity reads dozens of pages across multiple search rounds, then assembles a structured report with sections, sub-points, and a full source list at the end. What would take a researcher an hour or two of tab-juggling gets compressed into a few minutes. Pro users get 20 Deep Research queries per day; Max users get unlimited. Deep Research is essentially paywalled on the free tier, which is the single biggest reason to consider upgrading. The free plan's ceiling isn't the number of basic searches — it's the absence of this feature that you'll notice fastest.
Category: AI Research Assistant
Platform: iOS, Android, Web (Mac and Windows via browser)
Price: Free, with Pro at $20/month ($200/year) and Max at $200/month ($2,000/year)
Frequently Asked Questions
Yes — the free tier gives you unlimited basic searches with citations and about 5 Pro Search queries per day. Deep Research is effectively a paid feature, and the free plan also excludes image generation, Labs access, and frontier model selection. For occasional research it's genuinely usable. For daily work, the ceiling is low. Pro at $20/month ($200/year) lifts the most important caps: unlimited Pro Search, 20 Deep Research queries per day, 50 Labs queries per month, premium model access from OpenAI, Anthropic, and Google, and $5 in monthly Sonar API credits. Max at $200/month ($2,000/year) adds unlimited Labs, Perplexity Computer for agentic workflows, and priority access during peak periods — a tier aimed at power users with specific needs, not most people. There's also an Education Pro plan at $10/month for verified students and educators, which offers identical features to standard Pro at half the price.
No. Perplexity's entire value is built on live web search — every answer is assembled from real-time results, so an internet connection is non-negotiable. The app won't function offline, and that's by design rather than an oversight. If you need an AI assistant that works without a connection, a locally-run model like Ollama is a better fit for that specific use case.
On iOS and Android, Perplexity requests microphone access for voice search — that's the main one. It also asks for storage or photo library access if you want to upload files or images for analysis. Neither permission is required for standard text searches; you can decline both and the core experience still works fine. The web app at perplexity.ai runs entirely in your browser and requires no special permissions beyond what your browser already manages.