Roam Research started the modern wave of networked note-taking apps. Obsidian is the tool most people actually ended up using. Understanding why that happened says more about what matters in a PKM tool than any feature comparison alone.
What Roam actually costs and what that buys
Roam Research has no free tier. Pro runs $15/month or $165/year, and there's a legacy Believer plan at $500 one-time that bundles 5 years of Pro access for early supporters. Every note and every block can be referenced and linked from anywhere, building a personal knowledge graph where daily notes serve as the primary entry point into everything else.
Roam earned its place in note-taking history honestly: it sparked the tools-for-thought movement and directly influenced Logseq, Obsidian, and even Notion's database linking features. For a few years starting in 2020, it was the tool serious PKM practitioners talked about.
What that $15/month buys today is a web-only application with no native iOS or Android app, data stored on Roam's own servers (Google Firebase specifically) rather than locally, and a UI that's changed little since 2020. Development has slowed significantly since 2021, and Reddit's PKM communities increasingly point new users toward Logseq or Obsidian instead, both of which offer a comparable networked-thinking model at a fraction of the cost or entirely free.
What Obsidian actually costs and what that buys
Obsidian's core app is completely free for personal use: unlimited vaults, all core features, local storage, no account required. Sync costs $5/month for end-to-end encrypted multi-device syncing with 10GB storage and version history. Publish runs $10/month to turn notes into a public website with custom domains and password protection. Commercial use requires a $50/user/year license, separate from Sync or Publish.
Everything in Obsidian stores as plain Markdown files on your own disk, no proprietary format, no server dependency, no vendor lock-in. That local-first architecture is the single biggest structural difference from Roam: your notes are files you own and control, readable by any text editor, portable to any other tool, and functional forever even if Obsidian the company disappeared tomorrow.
The plugin ecosystem is enormous, more than 1,000 community plugins covering task management, kanban boards, spaced repetition, LaTeX rendering, and Dataview queries that let you treat your notes like a queryable database. Performance stays excellent even with 10,000-plus notes since everything reads from local files rather than a network round-trip.
Where the two tools actually differ in practice
Roam's cloud-native, always-connected model means your graph is accessible from any browser instantly, with real-time multiplayer collaboration built in, however limited in practice. Obsidian's local-first model means genuine offline reliability and data ownership, but multi-device sync requires either paying for Obsidian Sync or setting up a third-party solution like iCloud, Syncthing, or a self-hosted alternative yourself.
Roam's daily-notes-as-entry-point workflow is more opinionated out of the box, useful if you want a structured starting ritual without configuring anything. Obsidian is closer to a blank canvas: powerful once you've invested time picking plugins and building a system, but that investment is real and the learning curve genuinely steep for new users who want something that works well immediately.
Real cost for different users
A researcher or writer starting fresh with no existing PKM workflow: Obsidian's free tier costs nothing and covers real, serious use immediately, unlimited notes, full search, graph view, and the entire plugin ecosystem. Roam's $15/month with no free tier and no trial period beyond a 14-day evaluation makes it a much harder tool to justify testing seriously before committing financially.
Someone already deep in an established Roam workflow with years of accumulated notes: staying on Roam at $15/month, $180/year, avoids a real migration cost, since block references and Roam-specific query syntax don't map perfectly onto Obsidian's linking model. For an established user, the switching cost itself is often the actual reason to stay, not any remaining advantage Roam holds on features.
A small team wanting shared knowledge-graph collaboration: neither tool is really built for this. Roam's multiplayer features are limited, and Obsidian is fundamentally a personal tool requiring the separate $50/user/year commercial license just to use it in a business context at all, with Obsidian Publish handling public sharing but nothing resembling real team wiki functionality. Notion or Confluence handle actual team collaboration significantly better than either option here.
What actually breaks in practice
Roam's failure mode is momentum loss. A tool with slowed development and an unchanged interface since 2020 gradually falls behind as competitors ship features, fix rough edges, and grow their plugin ecosystems, and new users evaluating PKM tools today have less reason than ever to choose the more expensive, less actively developed option over free or cheaper alternatives that do the same core job.
Obsidian's failure mode is abandonment during setup. The blank-canvas approach that power users love overwhelms newcomers who install a dozen plugins immediately, get lost in configuration options, and never actually build the daily habit that makes any PKM tool valuable in the first place. The tool rewards patience during onboarding in a way Roam's more opinionated daily-notes structure doesn't require.
Data ownership and where your notes actually live
Obsidian stores everything as local Markdown files with no cloud dependency by default, no telemetry on vault content, and no AI training on user data, genuine data ownership rather than a marketing claim. The optional Sync service uses end-to-end encryption, meaning even Obsidian's own servers can't read your synced content.
Roam stores your graph on Google Firebase infrastructure with export available as JSON and Markdown, functional but described as not entirely seamless. Roam has no explicit published AI training policy, and as a smaller company, its privacy infrastructure is less formalized than larger competitors. An end-to-end encrypted graph option exists on the Believer plan specifically, implying standard Pro accounts don't have that protection by default.
For anyone treating their notes as a permanent personal archive meant to outlast any single company's business decisions, Obsidian's local-file architecture is a structural advantage Roam's cloud-only model can't match regardless of pricing.
Migrating from Roam to Obsidian
Roam's export to JSON and Markdown means a migration is technically possible without starting from scratch, but the fidelity isn't perfect. Roam's block-level references and nested block structure don't translate cleanly into Obsidian's file-and-link model, since Obsidian links at the note level by default rather than the block level, and replicating block-reference behavior requires community plugins that approximate but don't exactly replicate Roam's native query syntax.
A graph with a few hundred notes and simple bidirectional links migrates in an afternoon. A graph with years of deeply nested block references, embedded queries, and complex tag structures is a real project, likely worth budgeting a full weekend to move over deliberately and rebuild the parts that don't translate automatically, rather than trying to force an instant one-to-one conversion.
The upside of making that investment once is permanent: once notes live as local Markdown files in Obsidian, there's no future forced migration if a company changes pricing, shuts down, or gets acquired, the exact risk that's now working against Roam as its own development has slowed.
Which one to actually pick
Pick Obsidian for nearly any new PKM workflow in 2026. The free tier is genuinely complete, the plugin ecosystem dwarfs Roam's, and true data ownership through local Markdown files removes the vendor-dependency risk entirely.
Pick Roam only if you're already deeply invested in an existing Roam graph with a workflow built around its specific query syntax and block-reference patterns, where the switching cost to rebuild that structure in Obsidian genuinely outweighs the ongoing $15/month subscription.
For anyone starting from zero, there's no real contest: test Obsidian's free tier against real notes for a few weeks before considering Roam's paid-only model at all.