The Perplexity app is a free application that uses AI models such as OpenAI's GPT-4 and Anthropic's Claude 2 to provide users with up-to-date answers. It is available on the Google Play Store, where it has received a 4.7-star rating from over 416,000 reviews and has been downloaded more than 5 million times. Key features of the app include:

• Perplexity Copilot: This feature offers guided AI search for deeper exploration.
• Voice and text input: Users can ask questions using either their voice or by typing.
• Thread Follow-Up: This feature enables users to maintain a conversation for a deeper understanding of a topic.
• Cited sources: The app provides cited sources for each answer.
• Discover: This allows users to learn new things from the community.
• Your Library: A curation of discoveries, going beyond just search history.

The app can be used to look up information or fact-check, with some users reporting that it has provided answers to very specific queries, including technical issues and obscure information. The app also has a paid assistant feature. However, there are some issues reported by users. For example, one user reported that the model selection pop-up does not scroll on the Android app, limiting access to all available models, despite having a Pro account. The app collects data including location, personal information and other data, and may share app information and performance, as well as device or other IDs with third parties. Data is encrypted while in transit, and users can request that their data be deleted. The developer, Perplexity AI Inc., can be contacted via a phone number or email. The company is based in San Francisco. The app is listed alongside other similar apps such as Substack, GitHub, and Trello.