note-taking
(6)
Tana
Tana is an AI-native workspace that turns messy notes, meetings and voice memos into structured, queryable knowledge. Its signature feature, Supertags, lets any bullet point become a database record with defined fields, so notes double as a living knowledge graph that AI agents can read, summarize and act on. Founded in 2021 by ex-Googlers and productivity builders and based in Palo Alto with an engineering hub in Oslo, Tana raised a $14M Series A in February 2025 (led by Tola Capital), reaching $25M total funding after emerging from a stealth beta with a 160,000+ person waitlist.
Ideaflow
Ideaflow is a Palo Alto-based AI company building an 'intelligence amplification' layer for knowledge work. Its flagship product is a notebook that augments your thinking as you type, letting people capture and stitch together fragments of information. The company has since expanded into team knowledge tools - Base, which surfaces context from Slack, meetings, and documents, and meeting intelligence - aiming to become an organization's collective memory. Founded around 2015 by MIT Media Lab designer Jacob Cole and Etherpad/Meteor veteran David Greenspan, it has raised roughly $11M in seed funding from First Round Capital, 8VC, StartX, Naval Ravikant, and Tim Draper.
Productive.ai
Productive.ai (legally Phoneic, Inc.) is a San Mateo, California startup that turns ordinary cell phone calls into finished work. Its AI Call Assistant records and transcribes business calls, then automatically generates summaries, notes, tasks and calendar events and logs everything into the user's CRM - so that when the call ends, the paperwork is already done. Founded by messaging-and-voice veteran Enlai Chu, the company targets real estate agents, salespeople, recruiters, mortgage and medical professionals, and won the National Association of REALTORS 2023 Pitch Battle.
RemNote
RemNote is an all-in-one learning platform that fuses note-taking, PDF annotation, and spaced-repetition flashcards into a single app, so students never have to bounce between Notion, Anki, and Quizlet. Born at MIT in 2020, it lets learners write notes and turn them into flashcards instantly - or let its AI generate cards, quizzes, and summaries from PDFs, lectures, and videos. Backed by a $2.8M seed round and used by hundreds of thousands of learners (especially medical and pre-med students), RemNote aims to reinvent how people learn, think, and remember.
Notion
Notion is an all-in-one connected workspace that blends notes, docs, wikis, databases, projects, calendar, and email into a single, modular tool - 'LEGO for software.' Founded in San Francisco in 2013 by Ivan Zhao and Simon Last, it nearly collapsed before its 2016 rebirth and has since grown to more than 100 million users, $600M+ in annual recurring revenue, and an $11 billion valuation, increasingly positioning itself as an AI workspace with built-in agents.
Mem
Mem is an AI-native notes app that doubles as a thought partner. Founded by Kevin Moody and Dennis Xu, the company is rebuilding personal knowledge management around a simple bet: you should never have to organize information again. Backed by the OpenAI Startup Fund and Andreessen Horowitz, Mem captures voice, web, and email inputs and resurfaces them at exactly the right moment.