Obsidian
TAS Score: S2/3 – D3/5 – A2 / T0
Brief Description
Local-first knowledge management app based on plain Markdown files stored on your device. Rich plugin ecosystem. Free for personal use, paid for commercial and sync.
Architectural Role
Applications layer: personal knowledge base, note-taking, writing, and research tool. Files live on your filesystem – Obsidian is a viewer and editor, not a storage service.
Technical Autonomy
- ✅ Works without internet (fully offline; all files are local Markdown)
- ✅ Stores data locally (plain .md files in a folder you choose)
- ❌ Does not require external accounts – no account needed for local use, but Obsidian Sync and Publish require an account
- ✅ Allows data export (files are plain Markdown – nothing to export, they’re already yours)
- ❌ Provides offline updates – updates are pushed by Obsidian; app itself is proprietary
Philosophical Assessment (whose.world criteria)
| Criterion | Status | Comments |
|---|---|---|
| Pause | Yes | Close the app; files remain. No background sync unless you enabled Obsidian Sync. |
| Exit | Yes | Files are plain Markdown in a regular folder. Stop using Obsidian and keep everything. Open them in any text editor. |
| Recoverability | Partial | Local file versioning via plugins. No built-in backup. Depends on your filesystem and external backup tools. |
| Visibility | No | Proprietary application. Source code not available. Plugins are open source, but the core is closed. |
| External Dependencies | Partial | Core app works fully offline. Obsidian Sync and Publish are cloud services tied to Obsidian accounts. |
Why A2 and not A3
Obsidian scores well on Pause and Exit – your data is plain Markdown, fully portable, no lock-in. But the application itself is proprietary (T0), updates are controlled by the company, and there’s no way to audit what the app does. If Obsidian disappears, your files survive – but you need a new editor.
This is the A2 pattern: your data is autonomous, your tool is not.
Configuration (Minimal)
Download from obsidian.md. Open a folder. Start writing. No server, no Docker, no configuration.
For sync without Obsidian Sync, use Syncthing to sync the vault folder between devices.
Related Recipes
- Minimal Autonomous Server – use Syncthing to sync Obsidian vaults across devices without cloud.
Alternatives
- Logseq – open source (AGPL), similar local-first approach, but outliner-based
- Joplin – open source, Markdown notes with sync
- Notion – cloud-only, A0/T0 – more features, less autonomy
Trajectory
Direction: stable with tension.
Obsidian’s core promise – local Markdown files, no lock-in – has held since launch. But the company increasingly promotes Obsidian Sync and Publish as paid services, which are cloud-dependent. The app remains free for personal use, but commercial use requires a paid license. No concerning license changes, but the closed-source nature means the community has no recourse if priorities shift.