Cognito: AI Reading Companion

Cognito is an AI reading companion for iPhone and iPad that turns passive reading into active understanding. It allows users to chat with books, get instant summaries, and retain more information from EPUBs and PDFs.

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At a glance

Pricing

Free · Lifetime

Free tier

Yes

API

Skill level

Non-technical

About

What is Cognito: AI Reading Companion?

Cognito is an AI-powered reading companion designed for iOS and iPadOS, transforming how users interact with their digital books. It enables direct conversation with EPUBs and PDFs, allowing users to ask questions about characters, plot points, or arguments and receive answers strictly grounded in the text. Key features include contextual chat, semantic search for concepts across documents, and instant summaries. The app prioritizes privacy with on-device AI processing via Apple Intelligence, with an optional cloud fallback for deeper analysis. It supports EPUB and PDF imports, offers a customizable reading interface, and allows users to highlight passages and add notes. Cognito aims to help readers extract insights, summarize chapters, and build a knowledge base from their reading material.

Best used for

Ideal for students who need to deeply understand course materials, content creators who want to quickly extract key information from research, and writers who need to reference specific details across multiple books. Especially valuable for those seeking a privacy-focused AI tool for active reading and knowledge retention on iOS devices.

Common actions

understand books

summarize text

extract insights

search documents

chat with AI

mobile_appios

Capabilities

Key features

Contextual chat with books
Semantic search for concepts
Instant summaries
On-device AI processing
EPUB and PDF support
Privacy-first design

Target Audience

studentcontent creatorwriter

Integrations

Not yet documented

Pricing & Plans

Free · Lifetime · Starting at USD 5.00

Free

FAQs

What types of files can I import into Cognito?

Cognito supports importing both EPUB files via Readium and PDF files via PDFKit. All imported files are stored locally on your device, ensuring your library remains private and accessible only to you.

How does Cognito ensure my privacy with AI features?

Cognito prioritizes privacy by utilizing Apple Intelligence for on-device AI processing, meaning your data stays on your device. For deeper analysis, it offers an optional cloud fallback via OpenRouter with anonymous connections, and you control your data and API keys.

Can Cognito help me find specific information across my entire library?

Yes, Cognito features a semantic search capability that goes beyond keywords. Its vector-based RAG engine understands the context of your library, allowing you to find concepts and related ideas across all your imported documents, not just within a single book.

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