WhichNotes

An AI-powered second brain platform for knowledge workers, students, researchers, and content creators. It brings notes, ideas, and sources together in one place, automatically analyzes, summarizes, extracts topics, and creates connections between related notes, transforming scattered information into a living knowledge graph. Capture and summarization are not the real problem. People already have plenty of places to store information, and generic AI summaries quickly become another passive archive. The real value is helping someone recover the right piece of past context at the moment it becomes useful, understand why it is relevant, and trace it back to the original source. The winning product won't be a better note-taking app or an AI chat layer, but a low-friction, source-backed thinking system that continuously turns accumulated information into useful connections, updated briefs, and better decisions without requiring users to manually maintain a perfect folder or tagging structure. Mert has lived the product manager/founder workflow where context gets lost across meetings, research, and strategic documents. He built and shipped the entire WhichNotes product across the full stack, and his target segment of product managers and founders is one he understands personally. Prior experience at Wellbees and Onlayer gave him a disciplined approach to turning user insight into shipped product decisions. Two things changed simultaneously. First, AI models crossed a practical threshold: embeddings, larger context windows, and lower inference costs now make it possible to reliably understand messy multilingual content and identify meaningful relationships with source-level traceability. Second, AI has dramatically increased how quickly people produce and consume information, creating an information overload that didn't exist at this level three years ago. AI created the gap, and AI now provides the infrastructure to close it.