Notion is a collaborative all-in-one workspace built on cloud-hosted blocks — best for teams who need shared docs, databases, and wikis. Obsidian is a local-first Markdown editor with a graph view — built for individuals who own their knowledge base as plain files. They optimize for opposite use cases, and the right pick depends on whether your priority is collaboration or ownership.
| Feature | N Notion | O Obsidian |
|---|---|---|
| Storage model | Cloud-hosted | Local Markdown files |
| Real-time collaboration | Native | Paid sync add-on |
| Free plan | Unlimited blocks (personal) | Free forever (personal) |
| Team pricing | $10 / user / mo | $50 / user / yr (Commercial) |
| Mobile editing | Full feature parity | Read + limited edit |
| Plugins / extensions | Limited public API | 1500+ community plugins |
| Graph view | No native graph | Built-in local graph |
| Database / table | Powerful relational DB | Plugin-based |
| Offline-first | Online required | Yes, local files |
| Export formats | Markdown / HTML / PDF | Markdown native |
| Open source | No | No (free core) |
| Self-hosting | No | Yes (files on your disk) |
Notion's editor is built on typed blocks — every paragraph, image, callout, toggle, and database is a discrete unit you can drag, nest, and convert.
The block model is the foundation Notion's templates and databases stand on, and it's the single biggest reason teams reach for Notion: structure scales without breaking your formatting. The downside is that complex pages can feel heavy to render, and once you nest 4 layers of toggles, navigation becomes slow.
Obsidian's editor is the opposite philosophy: it's a Markdown source view (with optional live preview) that treats your note as a flat text file. There's no block primitive — paragraphs are just paragraphs, headings are just `#` characters. This makes Obsidian feel lighter and snappier, but extending the structure (callouts, embeds, dataview tables) requires plugins, syntax memorization, or community conventions. For a writer who likes plain text, Obsidian is freedom; for a team building a wiki, Notion's blocks are a clear win.
Both tools support `[[wikilinks]]` between pages, but their treatment is fundamentally different.
In Notion, links are navigational — clicking one takes you to the target page, and backlinks appear in a sidebar. There's no graph visualization, and the relationship model is hierarchical (pages live inside pages). This is fine for documentation, but PKM purists find it limiting.
Obsidian's killer feature is the local knowledge graph. Every `[[link]]` becomes an edge in a force-directed graph view, and you can zoom out to see the entire structure of your knowledge as it emerges. Obsidian also supports unlinked mentions, block references (`^block-id`), and outgoing/incoming link panels with deep filtering. If you're building a Zettelkasten or a second brain, Obsidian's linking is in a different league. If you're writing meeting notes, Notion's lighter linking is more than enough.
Notion stores everything on its own servers.
There is no self-hosted Notion — your data lives in a US-based AWS region with SOC 2 compliance, and you trust Notion's encryption and access controls. For most teams this is fine and even preferred; you get instant cross-device sync, sharing links, and zero IT overhead. But you don't own the bits, and the export-to-Markdown process loses fidelity for databases and complex pages.
Obsidian stores notes as plain Markdown files in a folder of your choosing. Sync between devices is your responsibility — you can use the paid Obsidian Sync add-on ($5/mo), iCloud, Dropbox, Syncthing, or a self-hosted Git repo. Privacy is absolute: nothing leaves your machine unless you choose to send it. The trade-off is friction: sync conflicts happen, mobile editing is constrained by file-system access, and onboarding a teammate takes more effort than sending a Notion share link.
Notion's free plan is generous for individuals (unlimited blocks, 5MB file uploads, 7-day version history) but team features start at $10/user/month for the Plus plan and $15/user/month for Business. Enterprise pricing is custom. The per-seat cost adds up quickly for larger teams.
Obsidian is free forever for personal use — even commercial-grade features like graph view, plugins, and themes cost nothing. The only paid pieces are Sync ($5/mo) and Publish ($10/mo), both optional. Companies using Obsidian for work need a Commercial license at $50/user/year (~$4/user/month), which is significantly cheaper than Notion at scale. For a 50-person team, Notion Plus costs $6,000/year; Obsidian Commercial costs $2,500/year — and Obsidian sync is opt-in per user.
Notion's mobile app is excellent: full editing parity with desktop, fast page navigation, and an app-store-grade UI.
The catch is that everything requires a live connection — Notion's offline mode is technically present but historically unreliable, and large workspaces can lag on mobile.
Obsidian's mobile app is functional but constrained by the file-system reality: you can read everything, but editing complex Markdown (especially with custom plugins or Dataview queries) is harder on a phone. Offline editing is rock-solid — that's what local files do — but the mobile experience can never match Notion's polish because Obsidian is fighting the iOS/Android sandbox to access your files.
Notion's API is public but limited.
You can read pages, write databases, and integrate with Zapier or n8n, but you cannot meaningfully extend the editor itself. The Notion app is closed-source. Templates exist (a marketplace of pre-built workspaces), but real customization is out of reach.
Obsidian's plugin ecosystem is the deepest in any note-taking app: 1500+ community plugins covering everything from Excalidraw embeds and Kanban boards to advanced graph algorithms, journaling workflows, and AI summarization. Plugins are JavaScript modules that hook into the Obsidian API, and many are written by the community in days. The trade-off is that plugins can break across Obsidian versions, configurations get complex, and a five-plugin setup will look totally different from a thirty-plugin setup. Obsidian is endlessly customizable; Notion is not.
If you've been torn between Notion's collaboration and Obsidian's local-first ownership — that gap is exactly what AFFiNE was built for. AFFiNE is an open-source workspace that combines block-based docs, infinite whiteboards, and local-first sync. Like Notion, you get real-time team collaboration and rich databases. Like Obsidian, your data stays on your device and your files are yours. The source is on GitHub: MIT for the editor and most of the code, and the AFFiNE Enterprise Edition license for the backend (free for development and self-hosted personal use). Unlike either of these, you don't have to choose.