OneNote is free, syncs everywhere, and lets you write anywhere on an infinite page. Obsidian costs nothing for the app, keeps your notes as files on your disk, and is built around linking ideas together.
They solve different problems, and the comparison usually goes in circles because people argue about features instead of naming the problem.
The short answer
OneNote if you capture: handwriting, screenshots, clipped pages, meeting scribbles, things pasted anywhere on a page.
Obsidian if you build: notes that reference each other, research that accumulates, writing you return to and extend.
Capture versus build. That is the whole distinction.
Side by side
| Obsidian | OneNote | |
|---|---|---|
| App cost | Free | Free |
| Sync | Free via iCloud/Dropbox; official Sync $4–5/mo | Free via OneDrive |
| Commercial use | $50/user/year licence | Included with Microsoft 365 |
| Where notes live | Markdown files on your disk | Microsoft’s proprietary format in OneDrive |
| Page model | Document, top to bottom | Infinite canvas — type anywhere |
| Handwriting | No | Excellent, with search inside ink |
| Linking notes | Core feature: backlinks, graph | Basic internal links only |
| Search | Fast, local, regex | Good, includes text inside images |
| Offline | Fully — files are local | Mostly, with sync conflicts possible |
| Extensibility | Large plugin ecosystem | Very limited |
| Learning curve | Real | Almost none |
What OneNote does that Obsidian cannot
Handwriting, properly. With a stylus, OneNote is still one of the best digital notebooks made. Ink is searchable, you can mix it with typed text on the same page, and it converts to text when you want. Obsidian has nothing comparable.
Free-form pages. A OneNote page is a canvas. Click anywhere and type. For lecture notes, sketched diagrams beside text, or annotating a screenshot, that freedom is genuinely useful.
Text inside images. OneNote OCRs images automatically. Photograph a whiteboard and its text becomes searchable. Obsidian stores the image and nothing else.
Zero setup. It works the moment you open it. No vault, no plugins, no decisions.
What Obsidian does that OneNote cannot
Your notes are files. Markdown in a folder you control. You can grep them, back them up with any tool, sync them however you like, and open them in any text editor in twenty years. If the company vanished tomorrow your notes would be unchanged.
OneNote’s format is Microsoft’s. Export exists and is awkward, and the free-form layout does not survive it well — the thing that makes OneNote pleasant is the thing that makes it hard to leave.
Links that accumulate. Backlinks and unlinked mentions mean a note written today surfaces automatically inside one written two years ago. For research, reading notes, or any body of knowledge that grows, this is the point.
Speed. Local files open instantly, and search across tens of thousands of notes stays fast. OneNote slows as notebooks grow.
Plugins. Task management, spaced repetition, Kanban, citation handling. OneNote gives you what Microsoft ships.
Which to pick
| If you… | Pick |
|---|---|
| Use a stylus or tablet for notes | OneNote |
| Take lecture or meeting notes by hand | OneNote |
| Are deep in Microsoft 365 at work | OneNote |
| Want zero setup | OneNote |
| Are building long-term research or writing | Obsidian |
| Want the files to outlive the app | Obsidian |
| Care about linking ideas | Obsidian |
| Work offline often | Obsidian |
Running both
A common and sensible split: OneNote for capture — handwriting, whiteboard photos, meeting scribbles — and Obsidian for anything you intend to keep and build on. Weekly, move what mattered from the first into the second.
What does not work is duplicating the same material in both. Nobody sustains that past a few weeks.
Frequently asked questions
Can I move notes from OneNote to Obsidian?
Yes, with third-party converters, and the result is imperfect. Text and images generally survive; the free-form positioning does not, because Markdown has no concept of it. Expect to tidy up manually.
Is OneNote really free?
The app is free with a Microsoft account, and includes 5 GB of OneDrive storage. Heavy use of images and ink fills that faster than people expect, and more storage is a paid Microsoft 365 plan.
Do I need Obsidian Sync?
No. iCloud, Dropbox and Git all work free. Sync at $4–5 a month adds end-to-end encryption, proper version history and conflict handling, which matters most on mobile.
Which is better for students?
OneNote, if you take notes by hand on a tablet during lectures. Obsidian, if you write essays and build on reading across a whole degree. Many students use both, in exactly that split.
What about team use?
OneNote, comfortably — shared notebooks and permissions are built in. Obsidian’s shared vaults work for two or three technical people and stop working beyond that.
Deciding
Ask what you actually do in a notes app. If the honest answer involves a pen, OneNote. If it involves connecting things you wrote months apart, Obsidian.
Tools worth your time, tested
New comparisons and fixes as we publish them, with pricing kept current. One email a week at most.
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