Roam Research and Obsidian both promise "networked thought," but they build it on opposite foundations. Roam is a cloud outliner where every bullet is an addressable block you can reference and reuse. Obsidian is a local-first editor where your notes are plain markdown files on your own disk, linked page-to-page. Same dream, different physics. (Full disclosure: we make a third notes app, and it wins nothing in this match — treat us as the referee.)
At a glance
| Roam Research | Obsidian | |
|---|---|---|
| Core model | Outliner — every block is linkable | Documents — markdown files + links |
| Where notes live | Roam's cloud (hosted graph) | Your disk, plain .md files |
| Signature feature | Block references, daily notes | Backlinks, graph view, canvas |
| Offline | Weak — built for the browser | Total — it's local software |
| Data ownership | Export your graph on request | Files you own outright, forever |
| Extensibility | Roam Depot plugins | Huge community plugin ecosystem |
| Learning curve | Steep — outlining is a whole habit | Steep but modular — start plain, add later |
| Price | Paid subscription only | Free for personal use; paid sync/publish |
Choose Roam if…
…you think in outlines and want the connections to form as you type. Roam's block-level linking is still the sharpest in the category: reference a single line anywhere, and it stays live in both places. The daily-notes-plus-backlinks loop is a genuinely different way to work — closer to a living Zettelkasten than a filing cabinet. If that clicks for you, little else feels the same.
The trade-offs are real. It's subscription-only, your graph lives on Roam's servers rather than your machine, and development has been quieter than the community once hoped. You're renting a workflow, not owning a library.
Choose Obsidian if…
…the files being yours is non-negotiable. Obsidian is a folder of markdown you can read, back up, and open in any editor for the next twenty years — the local-first case we make in full over on Notion vs Obsidian. It does backlinks and a graph view too, plus canvas and a deep plugin ecosystem, so you can build anything from a plain journal to a full second brain.
It just won't outline like Roam by default. Obsidian is document-first; block references exist but aren't the center of gravity. And "build anything" cuts both ways — the freedom is also a maintenance tax, which is worth weighing before you start. If you're deciding between systems rather than apps, note-taking methods lays out the options plainly.
The honest tie-breaker
Pick by where you want your thinking to live. Roam if the outline is the thought and you'll pay to have it hosted. Obsidian if owning the files matters more than any single feature. Everything else is detail.
The gap neither closes
Both are desks you sit down at — powerful, and demanding. Neither is built for the moment most ideas actually die: standing in a queue, phone in hand, thought evaporating before you can open a graph. That fast, offline, personal capture — get it saved in two seconds and still find it connected later — is a phone-first job, and the one Clair Mind was built for. If you'd rather choose from your situation than from feature lists, start with the app comparisons or the wider best notes apps guide.