DEVONthink vs Obsidian: Archive plus vault, both (2026)

DEVONthink ingests material somebody else made. PDFs, web pages, scans, email, files of any format, kept in their native formats inside its database, with OCR run over the images and its own AI classifying items into groups. Its search reaches inside those documents, which is the specific capability that justifies the price for anyone sitting on a research library.

Obsidian holds what you wrote. A vault is a folder of markdown files, and its features point at prose: wikilinks with autocomplete, a backlinks pane, a graph view, tags, and more than 2,000 community plugins layered above them. It does no OCR, classifies nothing, and manages no document library. Dragging 20,000 PDFs into an Obsidian vault is a mistake people make once.

The arrangement most Mac power users settle on is two libraries with one boundary. Sources, OCR, and questions about documents somebody else wrote go to DEVONthink. Obsidian holds the vault of markdown you did write, with the links between your own ideas. Both live on the same disk, so a note references a DEVONthink item by name or by link and the libraries stay separate.

That split works because the tools barely overlap. DEVONthink has wikilinks and backlinks and no graph, so it can hold markdown notes, and its interface was not built for writing them. Obsidian can store a PDF in the vault folder and cannot read the words inside it. Anyone insisting on one app is choosing which half of their material to serve badly.

DEVONthink keeps your files in their native formats, which is more respectful of your data than most databases manage, and the container is still DEVONthink's. You reach the library through DEVONthink, and its structure, metadata, groups, and links belong to the app rather than to the filesystem.

An Obsidian vault has no container. One note is one .md file with a name you chose, so Finder lists it, ripgrep searches it, Pandoc converts it, and a shell script rewrites 300 of them while Obsidian is closed. Nothing was imported to make that true and nothing needs exporting to keep it true. For notes you wrote yourself and expect to reread in a decade, that property outranks every feature either app advertises.

The most common complaint about DEVONthink is not the money, it is the complexity, documented for years across Mac power-user forums. The interface assumes you are running a large research database and reviewers regularly call it overkill for plain note-taking, which is fair about a product with a $499 Server tier. The reward for climbing that curve is a tool that handles enormous libraries without complaint.

Obsidian's first run is a smaller question and it is still a question: which folder, which plugins, which theme, which sync method. Its own documented costs are plugin quality variance, mobile compatibility problems, and slow startup on large vaults carrying many plugins. Neither app is the kind you open once and understand, and DEVONthink is the one with a manual.

DEVONthink 4 sells one-time licences at $99 Standard, $199 Pro, and $499 Server, with DEVONthink To Go for iOS bought separately. Upgrades are paid and arrive on a rhythm some users find subscription-like in practice, without any subscription existing. Sync runs through iCloud, Dropbox, WebDAV, or your local network, encrypted, with no vendor cloud in the middle, which is a strong privacy position at no recurring cost.

Obsidian costs nothing and has covered commercial use since February 2025, with a $50 per user per year licence you may buy voluntarily. Sync is $4-5 a month if you want the official service, and the free routes are iCloud, Syncthing, or the community git plugin, which carries documented index.lock errors, line-ending conflicts, and unstable merge handling on mobile. So the free app has the paid sync and the expensive app has the free sync.

DEVONthink 4 is $99 Standard, $199 Pro, and $499 Server as one-time licences, with the iOS app bought separately and paid upgrades on a roughly annual rhythm that some users find subscription-like in practice. That money buys OCR, AI classification, and encrypted sync through storage you already own. Obsidian is free for personal and commercial use, so its only line item is Sync at $4-5 a month, which is $48-60 a year, plus the optional $50 per user per year licence. Valutorio is a paid app on the Mac App Store, with sync as an optional subscription of its own. Owning DEVONthink plus a free Obsidian is $99, and for anyone with a real research archive alongside real writing that is the cheapest correct answer on this page.