What is Perplexity? Definition, how it works and differences with ChatGPT

What is Perplexity? At first glance, the tool looks like an AI chatbot such as ChatGPT. Yet it works differently: Perplexity presents itself mainly as an answer engine, capable of searching for information online, summarizing it and citing its sources. That is what makes it useful for comparing information, understanding a topic or carrying out a quick search. In this article, you will learn what Perplexity AI is, how it works, how it differs from ChatGPT, its advantages, its limits and the situations where it can genuinely be useful.

What is Perplexity? A simple definition

Perplexity is an AI-powered answer engine. It lets you ask a question in natural language, then generates a concise answer based on online sources cited in the result.

In other words, Perplexity sits between a search engine and an AI chatbot. Like Google, it searches for information on the web. Like ChatGPT, it formulates a clear, structured and readable answer. Its distinctive feature is that it combines both approaches: direct answers and sources you can consult.

In practical terms, Perplexity can be used to:

• understand a topic quickly
• search for recent information
• compare several sources
• summarize a web page
• explore a complex question
• prepare research
• find further reading ideas
• verify information

Perplexity is therefore especially useful when a user does not only want an answer, but also the sources needed to verify it.

What is the origin of Perplexity AI?

Perplexity AI is an American company founded in 2022 in San Francisco by Aravind Srinivas, Denis Yarats, Johnny Ho and Andy Konwinski. Its goal is to offer an answer engine capable of providing direct answers with cited sources.

Its positioning is quite clear: Perplexity does not only aim to be a chatbot, but to reinvent information search. The tool answers questions by combining web search, language models and visible citations.

This approach helps explain its success among students, professionals, content creators, researchers and users who want to get a quick answer without browsing ten different pages.

Who is behind Perplexity?

Perplexity is developed by Perplexity AI, Inc., a company based in San Francisco. Its co-founder and CEO is Aravind Srinivas, a former researcher at OpenAI, DeepMind and Google Brain.

The founding team brings together profiles from artificial intelligence, research and engineering. This background partly explains the tool’s very technical angle: Perplexity does not simply generate text, it tries to organize access to information.

For the user, this changes the usage logic. You do not simply ask Perplexity to “write an answer”. You use it more to explore a question, obtain sources and build a more reliable understanding of a topic.

How does Perplexity AI work?

Perplexity works by combining web search and AI-generated answers. The user asks a question, the tool searches for information, then produces a summary with links or citations.

This logic sets it apart from a traditional search engine. On Google, the user often has to open several results, compare sources and build the answer themselves. With Perplexity, a first summary is generated automatically.

The process generally relies on three steps:

1. The user asks a question.
2. Perplexity identifies relevant sources.
3. The tool generates a structured answer with citations.

This approach is useful for saving time, but it does not remove the need for verification. A summary can be well written while relying on sources that are incomplete, misinterpreted or not recent enough.

What is the difference between ChatGPT and Perplexity?

The difference between ChatGPT and Perplexity mainly comes from their primary use. ChatGPT is a versatile AI assistant designed to write, explain, create, rephrase or help with work. Perplexity is more of a sourced answer engine, focused on research and verification.

ChatGPT is often more suitable for:

• writing a text
• creating an outline
• rephrasing content
• generating ideas
• producing an email
• explaining a concept pedagogically
• working on a document or a prompt

Perplexity is often more suitable for:

• searching for recent information
• comparing several sources
• getting an answer with citations
• exploring a current topic
• checking a specific point
• finding references to consult

The question is therefore not whether Perplexity is “better” than ChatGPT. They are two different tools. ChatGPT is generally more comfortable for producing and structuring content. Perplexity is more relevant when the main goal is sourced information research.

Are you hesitating between several AI assistants? Read our guide to better understand ChatGPT’s role, then compare tools based on your use case:

What is ChatGPT? Definition, uses and limits

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Why use Perplexity?

Perplexity is useful when you want to quickly get a summarized answer with sources. It saves time during research, especially when a topic requires comparing several pieces of information.

The main advantages of Perplexity are:

• natural-language search
• direct answers
• source display
• the ability to explore a topic quickly
• access to recent information depending on available sources
• the possibility to ask follow-up questions

For example, if you want to understand a new technology, Perplexity can provide an initial answer, then let you go deeper with follow-up questions. To get more precise answers, the logic remains close to prompt engineering: the more focused your question is, the more useful Perplexity’s summary can be.

Is Perplexity free?

Yes, Perplexity offers a free plan, often called Standard, but with limits. Individual plans also include Perplexity Pro, Perplexity Max and Education Pro, with more advanced capabilities depending on needs.

The free version lets you discover the tool and perform basic searches. It may be enough for occasional use, such as understanding a topic, asking a few questions or testing how Perplexity AI works in English.

However, regular users may be limited by the number of advanced searches, access to models, files or certain premium features. That is where paid plans become more relevant.

What is Perplexity Pro?

Perplexity Pro is Perplexity’s main paid plan for users who want to go further than the free version. At the time this article was updated, Perplexity Pro is generally presented as an offer around €22 per month or ~€171 per year, with more advanced features than the free plan.

According to the features highlighted by Perplexity, Pro may notably provide access to more advanced searches, more file or image uploads, broader access to certain models, as well as search, image or video features depending on availability.

Perplexity Pro may therefore be useful for:

• students
• researchers
• content professionals
• analysts
• users who do a lot of monitoring
• people who want to compare sources quickly

But for simple use, the free version may be enough.

What is Perplexity Max?

Perplexity Max is a more advanced plan than Perplexity Pro. It targets users who need a higher level of access to recent models, research tools and new features.

At the time this article was updated, Perplexity Max is presented as an advanced plan at ~€171 per month or ~€1,716 per year. This plan mainly targets intensive users who want access to more models, advanced searches and premium features.

This plan is not necessary for most users. It is aimed more at profiles who use Perplexity intensively: professional research, competitive analysis, advanced monitoring, document production or exploration of complex topics.

For a user discovering Perplexity, it is better to start with the free version, then consider Pro if the limits become inconvenient.

Is Perplexity AI available in English?

Yes, Perplexity can be used in English. You simply need to ask your questions in English to get an answer in the same language.

Searches such as “Perplexity AI English”, “Perplexity English” or “Perplexity AI in English free” show that many users want to know whether the tool is truly accessible in English.

In practice, Perplexity understands English questions very well. It can answer in English, summarize sources, explain a topic or compare information. Quality still depends on the available sources. On some highly local topics, results may vary depending on the quality of the pages consulted.

Can you download Perplexity in English?

Perplexity can be used online from a browser and through its apps depending on the devices available. Searches such as “download Perplexity free” or “download Perplexity in English” often come from users looking for the mobile app.

The simplest option is usually to start with the web version, without installing anything. If you use the tool often, you can then install the official mobile app or use the integrations available for your device.

However, you should avoid third-party sites that promise an unofficial download. To reduce risks, always use official channels, such as the Perplexity website or recognized app stores.

Is Perplexity reliable?

Perplexity is useful, but its answers should not be considered automatically reliable. Its main advantage is that it cites sources, which makes verification easier. But a cited source does not guarantee that the summary is perfect.

The main limits are:

• sources that may be incomplete
• possible misinterpretation
• an answer that may be too condensed
• information that can become outdated
• excessive dependence on the sources found
• errors in prioritizing information

Perplexity is therefore more transparent than a chatbot without citations, but it does not replace human judgment. For an article, a professional decision or sensitive research, you should always consult the sources directly.

Is Perplexity better than Google?

Perplexity is not simply a “better Google”. It answers a different use case. Google displays a list of results, while Perplexity generates a summarized answer from sources.

Google remains more suitable for:

• comparing a large number of pages
• finding official websites
• searching for images, businesses, maps or local reviews
• directly analyzing the results of a SERP
• checking several points of view

Perplexity is more suitable for:

• understanding a topic quickly
• getting a first summary
• finding starting sources
• asking follow-up questions
• speeding up documentary research

In practice, the two tools can complement each other. Perplexity helps you understand quickly. Google helps you explore more broadly.

What are the risks of Perplexity?

The risks of Perplexity mainly concern the reliability of summaries, data confidentiality and excessive dependence on generated answers. Like any AI tool, Perplexity should be used carefully.

Like any AI tool connected to the web, Perplexity should be used carefully when sensitive data is involved. Before sharing a document, client information or personal data, it is better to check the privacy settings, terms of use and options related to data usage.

It is therefore better to avoid sharing:

• sensitive personal data
• detailed medical information
• confidential documents
• client data
• private financial information
• passwords
• internal content not intended to be shared

Perplexity states that it does not sell personal data, but that does not remove the need for cautious use, especially in a professional context.

Can Perplexity replace ChatGPT?

Perplexity does not fully replace ChatGPT, because the two tools are not optimized for the same tasks. Perplexity is excellent for researching and sourcing. ChatGPT is generally more versatile for writing, structuring, rephrasing, brainstorming or working on content.

For writing use cases, ChatGPT or a tool like Ai-chatpro may be more comfortable. For information research, Perplexity can be more effective because it puts sources at the center of the experience.

The best approach often consists of combining both:

1. Use Perplexity to search for and verify information.
2. Use ChatGPT or Ai-chatpro to structure, write or rephrase.
3. Review and verify manually before publication.

This separation between research and writing echoes the method explained in our guide to writing a text with AI without getting a generic result.

Want to compare Perplexity with other AI assistants? Our dedicated guide helps you choose based on your real use case:

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Is Perplexity useful for writing content?

Perplexity can help prepare content, but it is not necessarily the best tool for writing a full article. It is mainly useful for researching information, identifying sources and building an initial understanding of a topic.

For writing, it can be used to:

• find sources
• verify information
• identify angles
• understand a topic
• compare several points of view
• prepare a documentation base

However, to write a natural, structured article aligned with an editorial line, a content-production-oriented tool remains more suitable. This is where a platform like Ai-chatpro can complement Perplexity, by letting you work with several models depending on the need: writing, summarizing, rephrasing, analysis or idea generation.

If your goal is to turn this research into a complete article, our guide on writing a blog article with AI explains the method to follow after collecting information.

Which tool should you use in practice?

The right tool depends on your goal. If you want to search for information with sources, Perplexity is a very good choice. If you want to write a text, an email, an article or structured content, Ai-chatpro may be more suitable, because the platform lets you use several AI models from a single interface.

In practice:

• use Perplexity to search and source
• use Ai-chatpro to write, structure, rephrase or compare several models
• use your human review to improve
• use the original sources to verify

This combination is often more effective than using a single tool. It lets you separate research, writing and validation, while choosing the most relevant model for each task.

Perplexity review: should you use it?

Perplexity is a very interesting tool for people who want to search faster and get sourced answers. Its main benefit is reducing the time spent browsing several pages while keeping access to sources.

The most balanced opinion is simple: Perplexity is excellent for research, but it should not be used as automatic truth. It helps explore, understand and verify, but the user remains responsible for the final analysis.

Perplexity is especially useful if you:

• do a lot of monitoring
• compare tools
• work on recent topics
• look for sources
• want to understand a topic quickly
• prepare an article or a report

It is less suitable if you mainly want to produce a long, human, nuanced text that is perfectly aligned with an editorial strategy.

What to remember

• Perplexity is an AI answer engine that combines web search, automatic summarization and source citations.
• The keyword “what is Perplexity” corresponds to a discovery intent: understanding the tool, its uses, prices and limits.
• The difference between ChatGPT and Perplexity mainly comes down to usage: ChatGPT is more versatile, while Perplexity is more research-oriented.
• Perplexity offers a free version, as well as paid plans such as Pro and Max to access more models, searches and features.
• Perplexity is useful for searching and checking, but sources and answers must always be reviewed carefully.
• To produce complete content after research, it can be useful to combine Perplexity with a multi-model platform like Ai-chatpro.