Obsidian is a local-first note-taking and knowledge management application that stores all notes as plain Markdown files on the user's device, with end-to-end encrypted sync available as an optional paid add-on. It is built for individuals and researchers who want to connect ideas through bidirectional links, tags, and an interactive graph of note relationships.

Mem is an AI note-taking app that auto-links and organizes notes via embeddings without folders, with Mem Chat for natural-language search and drafting. Built for knowledge workers, founders, and researchers managing thousands of fragmented notes.

Reflect is a minimalist, networked note-taking app for macOS and iOS with Roam-style backlinks, end-to-end encryption, and a built-in AI assistant for rewriting, summarizing, and voice transcription. Aimed at knowledge workers and writers who want a daily-pages workflow with privacy by default.

Granola is an AI meeting notepad that transcribes your computer's audio directly and enhances your raw notes after each call, without joining as a bot. Built for product, sales, and investing teams running back-to-back meetings on Zoom, Meet, Teams, and in person.

NotebookLM is Google's AI research notebook that grounds every answer in sources the user uploads (PDFs, Google Docs, slides, web URLs, YouTube videos, audio files), with citations linking back to exact passages. Aimed at students, researchers, and knowledge workers synthesizing material across documents.