Obsidian - Sharpen your thinking
Sharpen your thinking.
The free and flexible app for your private thoughts.
From On Writing
Ideas can travel through time and space without being uttered out loud. The process of telepathy requires two places:
- A sending place, a transmission place — where the writer sends ideas, such as a desk
- A receiving place — where the reader receives the ideas/imagery such as a couch, a comfortable chair, in bed
Look, here’s a table covered with red cloth. On it is a cage the size of a small fish aquarium. In the cage is a white rabbit with a pink nose and pink-rimmed eyes. On its back, clearly marked in blue ink, is the numeral 8. The most interesting thing here isn’t even the carrot-munching rabbit in the cage, but the number on its back. I never opened my mouth and you never opened yours. We’re not even in the same year together, let alone the same room... except we are together. We are close. We’re having a meeting of the minds. We’ve engaged in an act of telepathy.
Your thoughts are yours.
Obsidian stores notes privately on your device, so you can access them quickly, even offline. No one else can read them, not even us.
Your mind is unique.
With thousands of plugins and themes, you can shape Obsidian to fit your way of thinking.
Your knowledge should last.
Obsidian uses open file formats, so you’re never locked in. You own your data for the long term.
Spark ideas.
From personal notes to journaling, knowledge bases, and project management, Obsidian gives you the tools to come up with ideas and organize them.
Links
Create connections between your notes. Link anything and everything — ideas, people, places, books, and beyond. Invent your own personal Wikipedia.
In Meditations on First Philosophy the philosopher René Descartes describes a series of doubts about the nature of reality, arriving at the famous phrase:
- [[I thin]]
- I think therefore I am
- Just think about it
- Thinking, Fast and SlowBooks/
- The ThingMovies/
He argues that doubting requires thinking, and therefore, the act of thinking confirms his existence.
Graph
Visualize the relationships between your notes. Find hidden patterns in your thinking through a visually engaging and interactive graph.
Canvas
An infinite space to research, brainstorm, diagram, and lay out your ideas. Canvas is a limitless playground for your mind. Learn more.
Rationalists
- Reason and innate knowledge → acquire knowledge
- Fundamental truths and principles can be known independent of experience
- A priori reasoning
- Reason and deduction
Empiricists
- Experience and sensory perception → acquire knowledge
- All knowledge is derived from experience and observation of the external world
- A posteriori reasoning
Build your ideal thinking space. With thousands of plugins and our open API, it’s easy to tailor Obsidian to fit your personal workflow. Learn more.
Sync securely.
Access your notes on any device, secured with end-to-end encryption. Learn more.
Version history. Easily track changes between revisions, with one year of version history for every note.
Collaboration. Work with your team on shared files without compromising your private data.
Fine-grained control. Decide which files and preferences you want to sync to which devices.
Publish instantly.
Turn your notes into an online wiki, knowledge base, documentation, or digital garden. Learn more.
Seamless editing.
Publish your notes instantly from the Obsidian app, and make it easy for readers to explore your web of ideas.
Customization.
Control the look and feel of your site with themes, custom domains, password protection, and more.
Optimized for performance.
Obsidian Publish sites are fast, mobile-friendly, and optimized for SEO, no configuration required.