Perplexity AI: The AI Search Engine with Source Citations, Overview

Anyone who types a question into the internet today mostly gets one thing from classic search engines: a list of blue links you have to click through yourself. Perplexity AI takes a different approach. The American company has positioned itself as a so-called answer engine – you ask a question in plain language and receive a fully written answer that is also backed up with source citations. For case workers, self-employed people, or anyone who professionally needs reliable information quickly, this is an interesting difference from a classic chatbot, which often simply asserts things without proof – more on this in the overview of AI models compared.

What is Perplexity AI? From search query to direct answer

• Perplexity website

In everyday use, it becomes clear what’s behind Perplexity AI, what using it looks like, what the subscription tiers currently cost, and what German users should keep in mind regarding data protection.

The basic idea: answers instead of link lists

Perplexity AI was founded in 2022 by a small team of former employees of large technology companies, among others with experience in AI research and the search engine field. The basic idea was clearly defined from the start: a search engine should not just list results, but summarize the information from them directly into an answer – in such a way that every statement can be traced back to a specific source. This combination of web search and AI text generation is called retrieval-augmented generation, or RAG for short, in technical language. For practical use you don’t need to know this term, but you should know the principle behind it: the AI does not freely invent the answer from its training, but first searches for current sources on the internet and then summarizes them.

Brief history and mission

Within a few years, Perplexity AI has developed from a niche product for tech-savvy users into a serious alternative in the search engine market. The company has completed several large funding rounds and is now valued in the billions. Its stated mission is to make knowledge more accessible by ensuring answers are immediately understandable and verifiable. In 2025, Comet was added, its own AI-powered web browser that integrates Perplexity’s features directly into browsing – now available for desktop, Android and iOS. This means Perplexity is positioning itself not just as a search engine anymore, but increasingly as a complete research environment.

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How does Perplexity work in practice?

Web version, app and browser

Perplexity can be used via the website, via mobile apps for iOS and Android, and via its own browser, Comet. The interface is deliberately kept simple: an input field where you type your question in plain German or English, below which the answer appears in text form, supplemented with numbered footnotes that point to the web pages used. Anyone wanting to dig deeper can click directly on any source and open the original page. For research involving images or diagrams, Perplexity can additionally include suitable graphics and, in some cases, self-generated visualizations.

Spaces: creating your own topic areas

One of the most practical features for everyday use is so-called Spaces. These let you create your own workspaces for a particular topic or project, into which you can additionally upload your own documents – such as listing exposés, contracts or market reports. All questions within a Space then draw on both the uploaded documents and the current web search. For someone working their way into a topic like real estate financing over several weeks, for example, this is much clearer than a long, unstructured chat history.

Model selection in the background: what happens when I ask a question?

For most users, this happens in the background without them noticing: Perplexity automatically decides which AI model is best suited for a request, combining its own lightweight models with access to large language models from other providers. Anyone who wants to, however, can also specify in the advanced settings which model should answer, or have several models respond to the same question at once and compare the results. Exactly how this interplay works, and which modes exist in detail, is explained in full on the in-depth models page: Perplexity AI models in detail.

The decisive difference from a classic chatbot is not the language model itself, but that Perplexity actively searches the web for fresh sources before every answer and openly names them.

Pricing models and subscription tiers at a glance (as of 2026)

Perplexity AI follows a classic freemium model with a free basic version and two paid tiers for heavy users. The following overview summarizes the state as of August 2026, though details can change at any time for such a fast-growing company.

For students, there is usually also a discounted education tier, and for businesses, Perplexity offers separate enterprise variants with additional administration and security features. For private or small-business use, the free version or the Pro subscription is generally entirely sufficient.

Data protection and GDPR: what users in Germany should know

Perplexity AI is a US company headquartered in the United States. This means: servers, data processing, and the large language models used in the background are technically located predominantly outside the European Union. Anyone searching via the web interface or the app sends their requests to US infrastructure, even though Perplexity now uses contractual mechanisms such as Standard Contractual Clauses – contract texts prescribed by the EU Commission intended to ensure a minimum level of data protection when transferring data to the USA – to legally safeguard the transfer of European data.

For private, everyday questions, this is unproblematic for most users. The picture changes when sensitive business information is involved – such as confidential property data, customer details, or internal calculations from the real estate industry. Before entering such information, it’s worth pausing for a moment: do I really want to send this information to an American cloud service? Anyone who regularly works professionally with sensitive real estate or financial data and values hosting and processing within Germany can now also find specialized alternatives such as Lukinski AI, which were developed specifically for this use case.

A rule of thumb for everyday use: anything you would also tell a stranger at a call center abroad, you can also enter into a US AI. For anything meant to stay confidential, caution is advisable.

Strengths and weaknesses of Perplexity AI

Like any tool, Perplexity has clear areas where it is particularly well suited, and others where different AI tools are the better choice.

Who is Perplexity AI suited for?

Perplexity AI is suited to anyone who regularly conducts research with traceable sources.

• Market research and current figures
• Tracking changes in legislation
• General knowledge questions
• Getting started without prior AI knowledge

For long creative texts or complex data analyses, a classic chatbot is often better suited.

Frequently asked questions (FAQ)

Can Perplexity AI be used for free?

Yes, there is a permanently free version with a limited number of in-depth research queries per day. For more intensive use, the Pro subscription is usually worthwhile.

Is Perplexity AI a search engine or a chatbot?

A bit of both: technically, Perplexity combines a classic web search with a language model that summarizes the search results into an answer. That’s why it is also referred to as an answer engine.

Can I use Perplexity in German?

Yes, questions and answers work reliably in German as well, even though some of the underlying models were originally trained more heavily on English.

Are Perplexity’s answers always correct?

No. The source citations make verification considerably easier, but they do not replace your own critical review, especially for important business or legal decisions.

How does Perplexity Pro differ from Perplexity Max?

Pro is aimed at individual users with regular research needs, while Max is aimed at power users and small teams who need the highest usage limits and access to several top-tier models at once.

Which specific AI models Perplexity combines in the background and how the individual research modes work technically is shown on the detailed models in-depth page: Perplexity AI models in detail.