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

Turn any article or PDF into an interactive experience. Highlight, take notes, save to your library, and ask AI about what you read.

Turn useful reading into knowledge you can return to. Coherence turns the articles and papers you read into something you can explore, and keeps everything you highlight, save and ask in one library. ★ MAKE ANY ARTICLE OR PDF INTERACTIVE Turn any web page or pdf article into an interactive overview, then add the learning modules you choose: a simulation with sliders, a concept explorer, a concept map, a glossary, real-world applications, a quiz, flashcards and more. See real examples, no sign-up needed: • A research paper: https://coherencebase.com/i/berry-curvature-dipole-circuit-quantum-electrodynamics • A magazine article: https://coherencebase.com/i/ai-proved-the-quasi-riemann-hypothesis-what-happens-now ★ HIGHLIGHT, NOTE AND MARK UP ANY PAGE Highlight in color, add notes, underline, draw shapes and tag passages on web pages and PDFs. Your notes stay on the page, and Auto-highlight can suggest the key points for you to review. CAPTURE WHAT MATTERS ★ UNDERSTAND ANY PASSAGE Select a sentence and spin a Lens: Explain, Simplify, Skeptic, Evidence, Context, Compare, Impact and more. Illuminate answers right beside the page, so you never lose your place. ★ ASK THE PAGE Chat with the article or paper you're reading. Ready prompts cover summaries, key takeaways, insights, questions and fact-checks, and the answers stay grounded in the text. ★ PDFS, UNDERSTOOD Open a PDF in Coherence's viewer: every title, figure, table and equation is recognized, and the paper becomes clean Markdown you can read, copy or export. Read it your way with themes, fonts and your own background. ★ ONE LIBRARY FOR EVERYTHING YOU READ Save pages, PDFs, passages, images, YouTube transcripts and supported social posts. Organize them in spaces, collections and tags, search in your own words, and chat with your whole library, with answers that link back to their sources. ★ WORKS WHERE YOU DO The same library in the Chrome extension, the web app (Windows, Mac, Linux) and the Coherence browser for Mac. Keep using your current browser; there's nothing to switch. Learn more: https://coherencebase.com/ Privacy: https://coherencebase.com/privacy Support: coherence@coherencebase.com