Obsidian

TAS Score: S2/3 – D3/5 – A2 / T0 S2 (not S3): Recoverability is partial — no built-in backup, depends on external tools (Q3). D3 (not D5): closed-source application (Q7 transparency fragility); Obsidian Sync is a cloud service (Q6 hidden cost); no telemetry audit possible. Critical criteria for this category: Exit.

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.

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.

Obsidian’s core promise — local Markdown files, no lock-in — has held since launch. The company promotes Obsidian Sync and Publish as paid cloud services, but these are opt-in additions, not replacements for local functionality. The closed-source nature means the community has no recourse if priorities shift.

Signal assessment:

Signal	Status	Evidence
License	➖	Proprietary app; free for personal use, paid for commercial use. No change since launch.
Feature gating	➖	Sync and Publish are paid cloud services, but local functionality is complete without them.
Self-hosting	➖	Local-first by design; no self-hosted server component (Sync uses Obsidian’s cloud).
Governance	⚠️	Privately held; no community governance; direction opaque. No open-source recourse if app is discontinued.

Signal key: ✅ opening · ➖ neutral · ⚠️ closing