Coherence connects reading with remembering. Focus on web pages and PDFs, highlight and annotate in context, ask AI as you read, then save the content to your library and build your AI-powered knowledge base. Turn any web page or PDF into an interactive experience. Search and ask questions across what you’ve kept when you need it again. Access your knowledge base from anywhere.

What real task does your product handle with GPT-6 Astra?

OpenAI models, namely GPT-5 and GPT-6, have been used extensively in building Coherence itself, and the same model families can power many of the product’s AI operations across reading, annotation, search, knowledge organization, and research.

Hi Product Hunt! I’m Tarek, the maker of Coherence. The idea behind Coherence is simple: the moment you read something should also be the moment it becomes part of your knowledge. Coherence brings focused reading, annotations, AI conversations, and your personal library into one connected workflow. Read a webpage or PDF, keep the passage that matters, add your own thinking, ask a question, and save it so you can return to it later. The part I’m most excited about is the connection between understanding something now and being able to use it again later. I’d especially love your feedback on the transition from reading → annotating → saving → asking your library. Where does it feel natural, and where does it get in your way?

What real task does your product handle with GPT-6 Astra?

Coherence

Turn what you read into knowledge you can use

Turn what you read into knowledge you can use