Documentation · head to head
Fumadocs vs Outline
Fumadocs
Documentation
Documentation framework for Next.js that treats the docs site as an application rather than a static export
- From
- Free
- Rated
- -
Outline
Documentation
Team knowledge base under the Business Source Licence, self-hostable or vendor hosted
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Fumadocs it is a library rather than a finished theme, so the initial setup is meaningfully longer than a generator that ships a working site from one command.; Outline the Business Source Licence is not an open source licence, so anyone planning to host Outline for clients, resell it or embed it in a commercial service is prohibited until the per-release change date passes, and this is regularly discovered only at legal review.
- They diverge on capability: Fumadocs covers Next.js App Router native, Outline covers Structured collections.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Fumadocs and Outline actually diverge.
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Documentation).
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 Fumadocs
- Next.js App Router native
- Multiple content sources
- OpenAPI page generation
- Built in search
- Headless and styled layers
- Type safe frontmatter
- Code and content colocation
Only in Outline
- Structured collections
- Block editor
- Search
- Backlinks and mentions
- Templates
- API and webhooks
- Single sign-on
- Self-hosting
What people use each for
The jobs each tool is most often brought in to do.
Fumadocs
- Documentation that must sit behind login and show different content to different customer plansnot Outline
- A Next.js product team that wants docs to deploy in the same pipeline as the applicationnot Outline
- API reference pages generated from an OpenAPI document alongside hand written guides in one navigation treenot Outline
- A design system site where the component documentation must render the live components from the same codebasenot Outline
Outline
- Running an internal wiki on your own infrastructure when documentation cannot leave a specific jurisdictionnot Fumadocs
- Replacing a general-purpose workspace tool with something narrower where search speed and writing flow matter mostnot Fumadocs
- Keeping engineering decision records and postmortems in templated documents that link to each other automaticallynot Fumadocs
- Giving a company already standardised on Google or Okta a wiki that inherits identity and group membership directlynot Fumadocs
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Fumadocs
- It is a library rather than a finished theme, so the initial setup is meaningfully longer than a generator that ships a working site from one command.
- Maintenance is concentrated in a very small group, so an unresponsive week is a blocked upgrade and there is no support contract to escalate to.
- It only targets Next.js, so adopting it commits the documentation to that framework and a later migration means rewriting the site rather than swapping a theme.
- Breaking changes have arrived across minor versions during rapid development, so pinning versions and reading migration notes is a recurring cost rather than a one off.
- Running docs inside the application means docs traffic hits your application infrastructure and shares its failure modes, where a separate static site would have stayed up.
Outline
- The Business Source Licence is not an open source licence, so anyone planning to host Outline for clients, resell it or embed it in a commercial service is prohibited until the per-release change date passes, and this is regularly discovered only at legal review.
- There is no local password authentication, so self-hosting requires an identity provider to be in place first, which turns a small internal wiki into a project with a dependency on Google, Okta, Entra or a Keycloak instance somebody has to run.
- Self-hosting needs Postgres, Redis and S3-compatible object storage together, so the operational footprint is larger than the single database most internal wikis require.
- The hosted plans offer no customer-selectable hosting region, so buyers with data residency obligations are pushed to self-hosting even when they would have paid to avoid running servers.
- It is built for internal knowledge rather than public documentation, with no versioned documentation sets, no static output and limited public publishing, so it will not serve as a product documentation site.
- Because it is a single-vendor project rather than a foundation-governed one, a future licence or pricing change applies to new releases and the only defence is staying on an older version.
Pricing, plan by plan
Fumadocs
Free- Open sourceFree
- MIT licence
- All packages included
- Self hosted or deployed with your Next.js application
Outline
Free- Self-hostedFree
- Source available under the Business Source Licence
- No licence fee for use inside your own organisation
- Requires Postgres, Redis and S3-compatible storage
- Team (hosted)$undefined/month
- Charged per user per month
- Hosted and maintained by the vendor
- Single sign-on through Google, Slack or Microsoft
- Enterprise (hosted)$undefined/month
- SAML single sign-on and provisioning
- Administrative controls and audit visibility
- Negotiated terms and support
Which should you pick?
Choose Fumadocs if
- You need next.js app router native.
- You want to start without paying.
- You work on Web, macOS, Windows, Linux.
- You also want multiple content sources.
Choose Outline if
- You need structured collections.
- You want to start without paying.
- You work on Web, Self-hosted, Docker, iOS, Android.
- You also want block editor.
Questions people ask
- Is Fumadocs or Outline better?
- Neither clearly leads. Fumadocs starts at Free and Outline at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Fumadocs or Outline?
- Fumadocs starts at Free and Outline at Free.
- Does Fumadocs or Outline run on more platforms?
- Fumadocs runs on Web, macOS, Windows, Linux. Outline runs on Web, Self-hosted, Docker, iOS, Android.
- Can I use Fumadocs for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Fumadocs best used for?
- Fumadocs is most often used for documentation that must sit behind login and show different content to different customer plans, a next.js product team that wants docs to deploy in the same pipeline as the application, api reference pages generated from an openapi document alongside hand written guides in one navigation tree, a design system site where the component documentation must render the live components from the same codebase. Of those, documentation that must sit behind login and show different content to different customer plans and a next.js product team that wants docs to deploy in the same pipeline as the application are not what Outline is typically brought in for.
- What can Fumadocs do that Outline cannot?
- Fumadocs covers Next.js App Router native, Multiple content sources, OpenAPI page generation, Built in search. Outline covers Structured collections, Block editor, Search, Backlinks and mentions.
Answered from the vendors’ own pages
Fumadocs: Can I put documentation behind authentication?
Yes. Pages are Next.js server components, so the same session and authorisation checks the rest of the application uses apply.
Outline: Is Outline open source?
No, not in the OSI sense. It is source available under the Business Source Licence, which permits internal use and self-hosting but not offering it as a service to others, with each release converting to an open source licence after its change date.
Fumadocs: Does it work outside Next.js?
No. The UI layer depends on the Next.js App Router.
Outline: Can I run it for free?
Yes, for your own organisation. Self-hosting carries no licence fee, only the cost of running Postgres, Redis, object storage and an identity provider.
Fumadocs: Can it generate pages from an OpenAPI spec?
Yes, including operation pages, schema rendering and an interactive request playground.
Outline: Can I choose where the hosted version stores data?
No. The hosted plans do not offer a region choice, so residency requirements mean self-hosting.
Fumadocs: Who maintains it and is that a risk?
A very small maintainer group. For a long lived commercial documentation set, treat the low bus factor as a real risk and budget for owning a fork.
Outline: Does it work for public product documentation?
Poorly. It has no versioned documentation sets or static site output, so it is best kept for internal knowledge.
Fumadocs: Do I still need a separate docs deployment?
No, and avoiding one is the main reason to choose it. The cost is that docs share your application uptime.
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