The free and flexible app for your private thoughts.

Obsidian (/ əbˈsɪdi.ən, ɒb -/ əb-SID-ee-ən ob-) [5] is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous …

Dec 9, 2025 · Obsidian has been used across history to make weapons, implements, tools, ornaments, and mirrors. Because of its conchoidal fracture (smooth curved surfaces and sharp …

Obsidian is an igneous rock, a volcanic glass used for thousands of years to make cutting tools.

Dec 7, 2025 · Obsidian is a highly adaptable and free note-taking app for power users who don't need collaboration features.

Jan 13, 2025 · Markdown Support: Obsidian uses Markdown, a simple formatting language that’s easy to learn. Customizable: Obsidian allows you to install plugins, change themes, and make …

Mar 23, 2023 · Obsidian is a wonderful and potentially life-changing app. But it’s also a complicated app, and getting started with Obsidian notes can be a challenge. If you’re new to …

Nov 27, 2023 · Unlock the power of Obsidian with this ultimate beginner's guide, from setup to advanced note-taking and knowledge management techniques.

Help documentation for Obsidian. Contribute to obsidianmd/obsidian-help development by creating an account on GitHub.

Obsidian is available for all major desktop and mobile platforms. These are all the supported ways to download and install Obsidian. Install Obsidian on Windows 1. Open your browser and go to …