Notion
Category: Concepts / Tools Summary: The all-in-one workspace that became the default operating system for a generation of knowledge workers and startups Last updated: 2026-04-06
Overview
Notion is a note-taking, knowledge management, and project management tool founded in 2013 by Ivan Zhao and Simon Last. It launched publicly in 2016 and became one of the fastest-growing productivity tools in history, reaching a $10 billion valuation in 2021.
Notion’s core insight: the rigid distinction between documents, spreadsheets, databases, and kanban boards is artificial. Everything is a block. Blocks can be combined into any structure you want. A page can contain a database. A database row can open into a full document. A database can be viewed as a table, a board, a gallery, a list, or a calendar.
For a certain generation of builders and knowledge workers, Notion became the place where everything lived.
The Block Model
Notion’s data model is unusually flexible. The base unit is a block: - A paragraph is a block - A heading is a block - An image is a block - A code snippet is a block - A table row is a block - A toggle is a block that contains more blocks
This composability means you can build almost any structure. The flip side is that an empty Notion page is intimidating — you have to decide what kind of structure you want before you can use it, which creates a design and organizational overhead that not every user wants.
Databases
Notion databases are what separate it from simpler note-taking tools. A database in Notion is a collection of pages (rows) with shared properties. Properties can be text, numbers, dates, checkboxes, select/multi-select, relations to other databases, and formulas.
This makes it possible to build: - CRM systems (contacts database linked to interactions database linked to companies) - Project management (tasks database with status, assignee, deadline, priority) - Content pipelines (articles database with stage, publish date, author, word count) - Personal knowledge bases (notes linked to people, projects, and concepts)
The relational linking between databases — a task linked to a person linked to a project — is what makes Notion powerful for operational work.
Why People Use It
Startups: Notion became the default for early-stage startups because it’s cheap, flexible, and fast to set up. You can build a basic CRM, a project tracker, and a knowledge base in a few hours without any configuration. The product evolved from note-taking to full team operating system.
Knowledge workers: For people who do a lot of writing, research, and synthesis, Notion works well because the document and database models are unified. You can write a document that also queries a database. You can maintain a reading list that links to notes that link to people you discussed the book with.
Personal operating systems: “Second brain” culture — influenced by Tiago Forte’s Building a Second Brain and the PARA method (Projects, Areas, Resources, Archive) — found Notion to be a natural home. The flexibility supports almost any personal knowledge management approach.
Jotion: Jack’s Notion System
Jack built Jotion — his personal OS running on top of Notion — extensively during 2024. Jotion V4.5 was a full personal operating system: tasks, goals, writing, reading, meetings, contacts, all connected in a single Notion workspace.
The appeal: Notion’s database relational model is genuinely powerful for connecting context across domains. A meeting with a person links to everything known about that person, which links to projects you’re working on together, which links to follow-ups from that meeting.
The limitation: Notion is slow at scale, its mobile experience has always been behind the desktop, and maintaining a complex system requires ongoing organizational work that competes with doing the actual work.
See Jotion for the full documentation of Jack’s Notion system.
Notion AI
Notion added AI features in 2023 — writing assistance, summarization, Q&A over your workspace content, autofill for database properties. The Q&A feature (asking questions and getting answers drawn from your existing notes) is the most genuinely useful: it turns your knowledge base into a retrievable memory rather than a searchable archive.
The limitation is that Notion AI currently lacks deep reasoning and long-context understanding. It’s useful for retrieval and summarization but not for complex inference across large knowledge bases.
The Competition
Notion faces serious competition: - Obsidian — Local markdown files, plugin ecosystem, graph view. Popular with users who want data portability and don’t trust cloud-only storage. - Linear — Replaced Notion for project management at many teams. Faster, more opinionated, better keyboard shortcuts. - Coda — Similar block model, stronger formulas and automation. - Confluence — Atlassian’s documentation tool, still dominant in large enterprises despite being worse than Notion by most measures. - Roam Research — Bidirectional linking, outliner model, popular with researchers and “networked thought” practitioners.