Documentation · head to head
Outline vs Read the Docs
Outline
Documentation
Team knowledge base under the Business Source Licence, self-hostable or vendor hosted
- From
- Free
- Rated
- -
Read the Docs
Documentation
Documentation hosting with versioning built for open source
- From
- Free
- Rated
- -
The short version
- Each has a real cost: 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.; Read the Docs build configuration is finicky, and build failures on dependency changes are a common frustration
- They diverge on capability: Outline covers Structured collections, Read the Docs covers Build on commit.
- Prices and features above were last checked on 30 August 2026.
Where they differ
Only the attributes on which Outline and Read the Docs actually diverge.
| Attribute | Outline | Read the Docs |
|---|---|---|
| Pricing model | Free to self-host, per user per month when hosted by the vendor | Free for open source; paid business plans for private documentation |
| Platforms | Web, Self-hosted, Docker, iOS, Android | Web, Cloud |
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 Outline
- Structured collections
- Block editor
- Search
- Backlinks and mentions
- Templates
- API and webhooks
- Single sign-on
- Self-hosting
Only in Read the Docs
- Build on commit
- Version by branch and tag
- Pull request previews
- Free for open source
What people use each for
The jobs each tool is most often brought in to do.
Outline
- Running an internal wiki on your own infrastructure when documentation cannot leave a specific jurisdictionnot Read the Docs
- Replacing a general-purpose workspace tool with something narrower where search speed and writing flow matter mostnot Read the Docs
- Keeping engineering decision records and postmortems in templated documents that link to each other automaticallynot Read the Docs
- Giving a company already standardised on Google or Okta a wiki that inherits identity and group membership directlynot Read the Docs
Read the Docs
- Open-source projects needing free hosted versioned documentationnot Outline
- Teams wanting docs rebuilt automatically on every commitnot Outline
- Reviewing documentation changes in a pull request before mergenot Outline
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
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.
Read the Docs
- Build configuration is finicky, and build failures on dependency changes are a common frustration
- Default themes are recognisable and dated, so sites look alike unless customised
- Private documentation requires a paid business plan
- Build times on large projects are slow enough to interrupt a review cycle
Pricing, plan by plan
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
Read the Docs
Free- FreeFree
- Core functionality
- Public projects
Which should you pick?
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.
Choose Read the Docs if
- You need build on commit.
- You want to start without paying.
- You work on Web, Cloud.
- You also want version by branch and tag.
Questions people ask
- Is Outline or Read the Docs better?
- Neither clearly leads. Outline starts at Free and Read the Docs at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Outline or Read the Docs?
- Outline starts at Free and Read the Docs at Free.
- Does Outline or Read the Docs run on more platforms?
- Outline runs on Web, Self-hosted, Docker, iOS, Android. Read the Docs runs on Web, Cloud.
- Can I use Outline for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Outline best used for?
- Outline is most often used for running an internal wiki on your own infrastructure when documentation cannot leave a specific jurisdiction, replacing a general-purpose workspace tool with something narrower where search speed and writing flow matter most, keeping engineering decision records and postmortems in templated documents that link to each other automatically, giving a company already standardised on google or okta a wiki that inherits identity and group membership directly. Of those, running an internal wiki on your own infrastructure when documentation cannot leave a specific jurisdiction and replacing a general-purpose workspace tool with something narrower where search speed and writing flow matter most are not what Read the Docs is typically brought in for.
- What can Outline do that Read the Docs cannot?
- Outline covers Structured collections, Block editor, Search, Backlinks and mentions. Read the Docs covers Build on commit, Version by branch and tag, Pull request previews, Free for open source.
Answered from the vendors’ own pages
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.
Read the Docs: Is Read the Docs free?
Free for open-source public projects. Private documentation requires a paid business plan.
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.
Read the Docs: What does it build from?
Most commonly Sphinx or MkDocs sources kept in your repository.
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.
Read the Docs: How does versioning work?
It maps branches and tags to documentation versions, so several releases are served side by side without manual work.
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.
Related pages
More on Read the Docs
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