Kortex

Kortex was a second brain and AI notetaking app built for content creators. It combined a collaborative document editor, a research library with source management and PDF reading, and an AI assistant called Kai, all in a multi-pane workspace with real-time sync, desktop and mobile apps, and Stripe billing.

After two years and 100K user sign ups, we shut it down and rebuilt from scratch as Eden. The full story is in Nine Lessons from a $3 Million Mistake.