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.

Obsidian is available on all major platforms. Download Obsidian for iOS, Android, macOS, Windows and Linux.

Free without limits. No sign-up required. No strings attached. Optional add-on services make it easy to sync and publish your notes.

Open Obsidian the same way you would open any other app. You can optionally download the APK for Android from the [Download Obsidian](https://obsidian.md/download) page.

Erica started Obsidian in 2020 to build the perfect note-taking app™ for her notes.

Obsidian Help Welcome to the official Obsidian Help site, where you can find tips and guides on how to use Obsidian. For API documentation visit the Obsidian Developer Docs. You can …

Cross-platform apps Obsidian is available on all major platforms, so you can sync notes to any device. Seamlessly work across Mac, Windows, Linux, iOS and Android.

Obsidian Mobile is blazing fast, so you can jot things down before you forget them. With the customizable toolbar and touch-friendly gestures, zip around your second brain with ease.

Basic formatting syntax Links to this page Advanced formatting syntax Create your first note CSS snippets Embed web pages Filters

Sync your notes across devices Links to this page Android app CSS snippets File recovery Home