Most developers who try both tools end up committing to one and abandoning the other. But which one depends almost entirely on what you want to do with it.
If you want to manage projects, share docs with teammates, and keep everything in one organized workspace: Notion. If you want a fast, private, offline-first place to store what you learn and connect ideas together over time: Obsidian.
That's the honest summary. Everything below explains why.
How they're fundamentally different
Notion stores your notes in their cloud database. Your content lives on their servers, organized as pages inside pages. It's like a more flexible version of Confluence or Google Docs, but with databases and views added on top.
Obsidian stores your notes as plain Markdown files on your own computer. There's no cloud by default. Your notes are just files in a folder. Obsidian reads them, adds a graph view and backlinks, and stays out of the way.
This difference shows up constantly in practice. With Notion, you need a decent internet connection to work properly. With Obsidian, you can be on a plane with no WiFi and everything works exactly the same as at your desk.
What developers usually need from a notes tool
Most developers want to keep track of things like:
- Solutions to bugs they've solved and might hit again
- Notes on libraries or frameworks they're learning
- Architecture decisions for ongoing projects
- Commands and flags they keep forgetting
- Research on tools they're evaluating
For this kind of content, Obsidian fits more naturally. You create a note, link it to related notes, and slowly build up a web of connected knowledge. The backlinks feature, where you can see every other note that references the current one, is genuinely useful once your library gets large. You search for a term you vaguely remember writing about and find it quickly.
With Notion, you'd organize this into databases or nested pages. It works, but the structure is top-down. You decide where everything lives before you create it. Obsidian is more bottom-up. You create notes and discover connections between them later. For a knowledge base that grows organically, that's a better fit.
Where Notion is clearly better
Notion wins for anything that involves other people or project tracking.
Sharing pages with a team is seamless in Notion. You can collaborate in real time, comment on specific content, set permissions, and organize shared docs in a way everyone can navigate. Obsidian is essentially a single-player tool.
Notion's database views are also really useful. A project tracker, a reading list, a bug log, a personal CRM. You can view the same data as a table, kanban board, or calendar depending on what you need. There's nothing comparable in Obsidian.
If you're a developer who also manages projects or works closely with non-technical teammates, Notion probably fits your overall workflow better. It's more of a workspace. Obsidian is more of a thinking tool.
The performance gap
Obsidian opens instantly. Search is instant. Everything is local. You can have 2,000 notes and still get results in under a second.
Notion is slower. Opening pages, searching across a large workspace, loading databases with many entries. It's not terrible, but it's noticeable. On a slow connection it gets worse.
For a developer who opens their notes tool constantly throughout the day, this difference adds up. Every time you need to look something up quickly and Notion takes four seconds to load a page, you notice it. Obsidian never has that problem.
Pricing
Notion has a free tier that's genuinely usable for personal use. The paid plan is $10/month and adds more version history, larger file uploads, and better collaboration features. If you're using it solo, the free plan handles most things.
Obsidian is free for personal use. Their Sync service is $5/month if you want to sync between devices through their servers. Most developers skip this and sync their vault with iCloud, Dropbox, or a private Git repo instead.
Which one should you use?
Use Notion if you're collaborating with a team, need project management features, or want one tool that handles notes and task tracking together. It's also better if you share docs with non-technical people who don't want to use anything complicated.
Use Obsidian if you want a personal knowledge base that's fast, works offline, stays private, and you're comfortable writing in Markdown. It fits developers well because the workflow (plain text files, linking references, building a searchable archive) matches how a lot of developers already work.
One common pattern: Obsidian for personal notes and learning, Notion for project tracking and shared team docs. They're different enough that using both doesn't really feel redundant.