Opennote

The notebook that thinks with you.

Y CombinatorSummer 2025ActiveConsumerAI-Enhanced LearningEducationSaaSConsumer

What they do

Problem

People struggle to write, organize, and apply their knowledge efficiently while working, and lack real-time feedback and research support in their notes.

Solution

Opennote is an AI-powered notebook that edits writing, references personal and web knowledge, runs background tasks, and provides feedback as you work.

Who it's for

Knowledge workers, students, and writers who use notebooks to draft, research, and manage information.