Opennote
Opennote was an AI notebook for your best thinking.
We raised $4.2M from Y Combinator, Acrew Capital, Long Journey Ventures, Paul Graham, and founders of Deel, Auth0, Unacademy, and Eight Sleep.
In May 2026, Opennote was acquired by Reducto. At Opennote, we helped students find the right context in their notes and course materials; at Reducto, that same idea extends to making documents truly usable for systems, workflows, and agents.
Read more about the acquisition here: