Obsidian Deep Dive

Obsidian is closed-source but free for personal use, with markdown files on local disk — the most popular PKM tool of 2024-26 by a wide margin. Companion to pkm-overview-methodologies; for OSS alternatives see pkm-logseq-deep, pkm-org-mode-orgroam, pkm-anytype-appflowy-affine, pkm-trilium-silverbullet; sync in pkm-sync-storage-syncthing; see also selfhost-notes-wiki, prod-note-taking-consumer, markdown.

Why people pick Obsidian

★ ★ Markdown files on disk. No DB, no lock-in. Move the folder, you keep your notes. The single biggest reason it dominates.
★ Bidirectional [[wikilinks]] + backlinks panel built in.
★ 2,000+ community plugins. Whatever workflow you imagine, someone has plugged it in.
★ Active development, sustainable indie team (founders Erica Xu + Shida Li, ex-Dynalist).
Free for personal, paid for Commercial ($50/yr) and optional Sync ($5–10/mo) and Publish (~$10/mo).
Closed source caveat. The core app isn't OSS. The file format (markdown) and most plugins are; vault portability is the key OSS-flavoured property.

★ ★ Dataview — query language over your vault; lists, tables, calendars from frontmatter / inline fields. The most-loved plugin.
- https://github.com/blacksmithgu/obsidian-dataview
★ Templater — rich templates with JavaScript; date stamps, prompts, dynamic content.
- https://github.com/SilentVoid13/Templater
★ Tasks — emoji / metadata task system; recurring tasks; cross-vault task views.
- https://github.com/obsidian-tasks-group/obsidian-tasks
★ Periodic Notes — daily / weekly / monthly / quarterly / yearly notes templating.
★ Obsidian Git — auto-commit + push your vault; the free sync alternative — see pkm-sync-storage-syncthing.
★ Obsidian Web Clipper ★ — official browser extension launched late 2024; OSS; clip pages directly into the vault as markdown — see pkm-capture-web-clippers.
QuickAdd — capture macros: prompt → template → folder.
Excalidraw — embed Excalidraw drawings inside notes.
Canvas (built-in) — infinite-canvas spatial layout.
Calendar — sidebar calendar tied to daily notes.
Advanced Tables — markdown table editing UX.
Buttons / Meta Bind — clickable in-note actions.
MetaEdit — edit frontmatter without touching YAML.
Breadcrumbs — explicit hierarchy on top of links.
Spaced Repetition — flashcards from notes; review queue inside Obsidian — see pkm-pkm-meets-anki.
Smart Connections / Khoj / Copilot — AI plugins — see pkm-ai-llm-augmentation.

★ Flat + tags + links. Most successful vaults barely use folders; a flat notes/ + tags + wikilinks scales further than nested folders.
PARA folders. 01 Projects/ 02 Areas/ 03 Resources/ 04 Archive/ — see pkm-para-basb.
Date-prefixed daily notes — Daily/2026/05/2026-05-09.md; ISO 8601.
Per-source literature notes — Lit/{author-year-shorttitle}.md; great for academics — see pkm-academic-zotero-workflow.

★ Syncthing — free OSS; works on every desktop + Android; iOS via Möbius Sync (paid). The default OSS sync — see pkm-sync-storage-syncthing.
★ Obsidian Git plugin — push to GitHub / Forgejo / Gitea; cheap conflict resolution.
Obsidian Sync — paid (~$5–10/mo); E2E encrypted; the easiest path on iOS.
iCloud Drive — works for Mac/iOS only; quirky on conflicts.
WebDAV plugin — paid plugin (Remotely Save covers this for free OSS); works with Nextcloud / OwnCloud / Fastmail Files.
CouchDB self-host (livesync plugin) — free OSS plugin "Self-hosted LiveSync" — most reliable real-time sync without paying Obsidian.

Bases — Obsidian's built-in database view, launched 2024–25, ships with a Notion-style table over notes (no Dataview needed for basics). Coexists with Dataview; Dataview is still richer for complex queries.

★ Daily note + meeting notes + project pages — Periodic Notes plugin + Templater. Add [[Today]] links to anything you discuss.
★ Zotero → Obsidian — Zotero Integration plugin imports literature notes per source; pair with Citations plugin — see pkm-academic-zotero-workflow.
Readwise → Obsidian — official Readwise plugin; daily highlight sync. See pkm-readwise-hypothesis-workflow.
Inbox processing — 00 Inbox/ folder with capture-only items; weekly review file moves them.
Spaced rep over notes — Spaced Repetition plugin; embed flashcards directly in notes.

Closed source core. Bus factor / future risk. Mitigated by the markdown-on-disk property — your notes survive Obsidian.
Mobile is good but not great. Slower than desktop; large vaults feel it.
Plugin sprawl. "Use 30 plugins to get a working setup" is real. Pick 5; add more sparingly.
No real multi-user. Designed for single-user vaults. For team wikis see selfhost-notes-wiki.
Dataview is JS-injected — power-user only; learning curve is steep.

You want markdown files on disk + a great editor: Obsidian, no contest.
You want pure FOSS: Logseq or Joplin — see pkm-logseq-deep, pkm-joplin-standard-notes.
You think in outlines: Logseq fits better.
You're an Emacs user: Org-roam — see pkm-org-mode-orgroam.
You're a team: Outline / BookStack — see selfhost-notes-wiki.
You're publishing: Obsidian + Quartz — see pkm-publishing-digital-gardens-quartz.