Coherence — AI Reader, Web Clipper, Annotator & Knowledge Base (Web & PDF)

Save and annotate web pages and PDFs, organize your knowledge, and explore what you read with AI.

Turn useful reading into knowledge you can return to. Coherence brings capture, focused reading, annotation, organization, and AI assistance into your browsing workflow. Work with web pages, PDFs, supported social posts, images, and available YouTube transcripts, then revisit what matters in your personal Coherence library. CAPTURE WHAT MATTERS Save web pages, PDFs, selected passages, page elements, supported social posts, images, and available YouTube transcripts. Keep the original source connected so you can return to the full context later. READ AND ANNOTATE Use focus and readability tools to make web pages easier to read. Highlight passages, add notes, select meaningful content, and keep your thinking connected to the source. Open PDFs in Coherence’s viewer to read, annotate, analyze layouts, view extracted Markdown, and explore document insights. SAVE AND ORGANIZE Build a library around the ideas, projects, and questions you care about. Organize saved material with spaces, collections, tags, and favorites. Use search, filters, and related-content suggestions to find useful reading again. EXPLORE WITH AI Ask questions about what you are reading, request explanations, generate summaries, and explore key ideas from different angles. Coherence supports AI-assisted tools such as auto-annotation, document chat, configurable prompts, agents/personas, Illuminate, Lenses, Delve, and interactive learning experiences where available. CHAT WITH YOUR KNOWLEDGE Use your saved library as context for questions, comparison, synthesis, and follow-up research. AI features process your prompt and relevant content through online services. Responses can be inaccurate, so check important details against the original source. KEEP YOUR READING CONNECTED Sign in to use your Coherence account and supported cloud features. The Chrome extension helps you capture and work with material where you read. The web app gives you access to your full library, search, organization, and knowledge-base workflows. An optional connection to the Coherence desktop app supports local synchronization; the desktop app is not required for the extension’s cloud reading workflow. BEFORE YOU START - A Coherence account is required for the production extension. Email/password and optional Google sign-in are available through the Coherence website. - Cloud and AI features require an internet connection. AI and PDF processing are subject to the allowances shown in your account. - Feature availability can vary by plan, platform, source page, and document type. YouTube transcripts require available captions. PDF extraction depends on the source document. - Website access supports in-page reading tools, capture, annotation, and the optional activation-on-all-pages setting. It does not grant access to Chrome’s protected pages. Some websites restrict embedded previews or page processing. - Local PDF access requires enabling file-URL access in Chrome’s extension settings if you choose that workflow. - Your use of online AI features may send prompts and relevant content to service providers. Review our privacy policy before submitting sensitive material. Learn more: https://coherencebase.com/ Privacy: https://coherencebase.com/privacy Support: coherence@coherencebase.com