Note-taking Startups funded by Y Combinator (YC) 2026

Epicenter is an ecosystem of open-source, local-first apps that share a memory. We store all your work—notes, transcripts, chat histories—in a single folder of plain text and SQLite. Every tool we build shares this memory: your text editor, personal assistant, etc.. It's open, tweakable, and yours. Grep it, open it in Obsidian, host it wherever you like. The choice is yours. Our vision is to build a personal workspace where you own your data, choose your own AI models, and replace siloed apps with open, interoperable alternatives. All while preserving authenticity and being free and open source. ❤️

Heptabase is an intelligent, visual knowledge base built for students, researchers, and lifelong learners. Our product helps you master anything you learn and do your best research with AI. Heptabase is backed by Y Combinator, HOF Capital, Kleiner Perkins, Moving Capital, Tonic Fund, and other investors, including the founders of Socialcam, Triplebyte, Codementor, and more.

Fathom captures your meetings your way – bot or bot-free, on any call. Ask questions across your entire meeting history and get instant, cited answers. Connect your intelligence to Claude, ChatGPT, your CRM, and more. Desktop, mobile, and in-person. The real value of meetings isn't just the notes. It's the knowledge inside them. #1 AI Notetaker on G2. Works with Zoom, Meet, and Teams.

WorkFlowy is a tool for organizing your brain. It provides a powerful interface for hierarchical lists. People use it as a replacement for text editors and spreadsheets as organizational tools. They leave it open all day and put whatever passes through their brain in it - project plans, to-do's, meeting notes, brainstorms, etc..

We built a new style of text editor from the ground up to better support creative thinking. Clover lets you explode traditional, linear documents into an infinite "surface" for a more intuitive, visual way of note-taking, brainstorming, mind-mapping, and managing tasks.