Softwr

Research · head to head

Obsidian vs REDCap

Obsidian logo

Obsidian

Research

A powerful knowledge base on top of a local folder of plain text Markdown files

From
Free
Rated
-
Full reviewWebsite
REDCap logo

REDCap

Research

Research data capture licensed free to non-profits, and not licensable at all to companies

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Obsidian has a free tier, so it costs nothing to try first.
  • Each has a real cost: Obsidian sync is a paid add-on at $4 per month billed annually rather than part of the app; REDCap a for-profit company cannot hold a licence or self-host REDCap, so a biotech or CRO that liked it at university simply cannot deploy it the same way and must buy a commercially licensed hosted version instead.
  • They diverge on capability: Obsidian covers Bidirectional linking, REDCap covers Form and survey designer.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Obsidian and REDCap actually diverge.

Attributes where Obsidian and REDCap differ
AttributeObsidianREDCap
Starting priceFreeOn request
Pricing modelUnknownquote
Free tierYesNo
PlatformsWeb, Windows, macOS, Linux, iOS, AndroidWeb, Linux, Windows
Founded2020Unknown

Identical on both: user rating (Not yet rated), category (Research).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Obsidian

  • Bidirectional linking
  • Graph view visualization
  • Markdown support
  • Local file storage
  • Plugin ecosystem
  • Custom CSS themes
  • Templates
  • Search and tags

Only in REDCap

  • Form and survey designer
  • Longitudinal projects
  • Data quality rules
  • Randomisation
  • Audit trail and e-signature
  • API and exports

What people use each for

The jobs each tool is most often brought in to do.

Obsidian

  • Local-first markdown note taking with no account requirednot REDCap
  • Linking notes into a personal knowledge graphnot REDCap
  • Syncing a vault across devices with end-to-end encryption on the paid add-onnot REDCap
  • Publishing a public site from a vaultnot REDCap
  • Extending the editor with community pluginsnot REDCap

REDCap

  • An academic research group at an institution that already runs REDCap, where a new study database costs nothing beyond the time to build itnot Obsidian
  • A hospital collecting patient reported outcomes where data must stay on institutional infrastructure rather than a vendor cloudnot Obsidian
  • An investigator initiated trial that needs randomisation, an audit trail and statistical export without a commercial EDC budgetnot Obsidian
  • A multi site academic collaboration where each site can be given scoped access to a single longitudinal projectnot Obsidian

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Obsidian

  • Sync is a paid add-on at $4 per month billed annually rather than part of the app
  • Publishing to the web is a further $8 per month per site
  • Commercial use asks for a $50 per user per year licence, though the vendor states it is not required
  • Collaboration is limited compared with a hosted notes tool, since the vault is local files first

REDCap

  • A for-profit company cannot hold a licence or self-host REDCap, so a biotech or CRO that liked it at university simply cannot deploy it the same way and must buy a commercially licensed hosted version instead.
  • Because each institution hosts its own instance, support, uptime, backup and version currency vary by university, and a researcher has no recourse to Vanderbilt when the local instance is two years out of date.
  • It is free of licence fee but not free of cost: the hosting institution carries server, security, patching and support staffing, which is why some institutions charge internal recharges per project.
  • Validation for regulated use is the deploying institution responsibility, so an instance is not Part 11 compliant simply because REDCap supports the features; someone locally has to produce and maintain the evidence.
  • The interface and reporting are dated compared with commercial survey and EDC tools, and complex logic is built through data dictionary spreadsheets rather than a modern visual builder, which slows non technical study teams.

Pricing, plan by plan

Obsidian

Free
  • Obsidian Sync$4/month
    • Sync notes across devices
  • Obsidian Publish$8/month
    • Turn notes into a website

REDCap

On request
  • REDCap non-profit licence$undefined/year
    • No licence fee to non-profit and government institutions that join the consortium
    • Institution must install and host it on its own infrastructure
    • For-profit organisations may not hold a licence or self-host

Which should you pick?

Choose Obsidian if

  • You need bidirectional linking.
  • You want to start without paying.
  • You work on Web, Windows, macOS, Linux, iOS, Android.
  • You also want graph view visualization.
Obsidian review

Choose REDCap if

  • You need form and survey designer.
  • You work on Web, Linux, Windows.
  • You also want longitudinal projects.
REDCap review

Questions people ask

Is Obsidian or REDCap better?
Neither clearly leads. Obsidian starts at Free and REDCap at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Obsidian or REDCap?
Obsidian has a free tier; the other does not. Paid plans start at Free for Obsidian and On request for REDCap.
Does Obsidian or REDCap run on more platforms?
Obsidian runs on Web, Windows, macOS, Linux, iOS, Android. REDCap runs on Web, Linux, Windows.
Can I use Obsidian for free?
Yes. Obsidian has a free tier, so you can try it without paying. REDCap starts at On request.
What is Obsidian best used for?
Obsidian is most often used for local-first markdown note taking with no account required, linking notes into a personal knowledge graph, syncing a vault across devices with end-to-end encryption on the paid add-on, publishing a public site from a vault. Of those, local-first markdown note taking with no account required and linking notes into a personal knowledge graph are not what REDCap is typically brought in for.
What can Obsidian do that REDCap cannot?
Obsidian covers Bidirectional linking, Graph view visualization, Markdown support, Local file storage. REDCap covers Form and survey designer, Longitudinal projects, Data quality rules, Randomisation.

Answered from the vendors’ own pages

Obsidian: Is Obsidian free?

Yes. The core Obsidian application is 100% free for personal and commercial use with no limitations. You can use unlimited vaults and every core feature without payment.

Source
REDCap: Is REDCap really free?

The licence is free to non-profit institutions and government organisations that join the consortium, but they must host and support it themselves, so there is real internal cost.

Obsidian: What file format does Obsidian use?

Obsidian stores every note as a plain Markdown file. Because it uses standard Markdown instead of a proprietary format, your notes remain portable and can be edited with many other Markdown editors.

Source
REDCap: Can my company use REDCap?

Not by holding a licence or self-hosting. For-profit organisations must use a separately licensed commercial hosted route.

Obsidian: Can I collaborate with others in Obsidian?

The core application does not include built-in team collaboration features. However, Obsidian offers optional add-ons and can be used with version control systems or cloud storage for collaboration.

Source
REDCap: Is REDCap 21 CFR Part 11 compliant?

It has the features to support Part 11 use, but compliance depends on how the hosting institution configures, validates and documents its own instance.

REDCap: Who supports it?

Your local institutional REDCap administrator, not Vanderbilt. Support quality varies by site.

Share

Related pages

More on Obsidian

More on REDCap

Keep looking

Other head to heads