Documentation · head to head
Slab vs Sphinx
Slab
Documentation
Internal knowledge base for teams, organised by topic rather than folders, with search across connected tools
- From
- Free
- Rated
- -
Sphinx
Documentation
Documentation generator built for large technical projects
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Slab it is built for internal knowledge, so public product documentation on a custom domain with versioning is outside what the product does.; Sphinx reStructuredText is harder to write than Markdown and puts off contributors, though MyST now allows Markdown
- They diverge on capability: Slab covers Topics instead of folders, Sphinx covers Cross-references.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Slab and Sphinx 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 Slab
- Topics instead of folders
- Unified search
- Post verification
- Quill editor
- Permissions
- Free tier for small teams
Only in Sphinx
- Cross-references
- API autodoc
- Multi-format output
- Extension ecosystem
What people use each for
The jobs each tool is most often brought in to do.
Slab
- Building an employee handbook and onboarding path that new starters can actually findnot Sphinx
- Replacing a folder-based wiki where nobody agrees which folder a document belongs innot Sphinx
- Companies whose knowledge is already spread across Drive, Slack and GitHub and needs one search boxnot Sphinx
- Documenting process and decisions for teams that do not want a project management tool attachednot Sphinx
Sphinx
- Large technical documentation needing reliable cross-referencesnot Slab
- Python projects generating API docs from docstringsnot Slab
- Documentation that must ship as PDF as well as HTMLnot Slab
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Slab
- It is built for internal knowledge, so public product documentation on a custom domain with versioning is outside what the product does.
- There is no docs-as-code workflow, no git synchronisation and no markdown files on disk, so engineering-owned technical documentation ends up somewhere else anyway.
- Hierarchy is shallow by design, and organisations that genuinely need deep nested structure find topics an awkward substitute rather than an improvement.
- There is no offline mode, so a knowledge base that includes incident runbooks is unavailable during exactly the incident where the network is the problem.
- Pricing is per user per month, so organisations where most staff only read a handbook twice a year still pay a seat for each of them.
Sphinx
- reStructuredText is harder to write than Markdown and puts off contributors, though MyST now allows Markdown
- Configuration is complex and the default output is dated-looking without theme work
- Build times on large documentation sets are slow
- Heavier than the problem for a small project that only needs a few pages
Pricing, plan by plan
Slab
Free- FreeFree
- Up to ten users
- Unlimited posts
- Core integrations
- Slab$undefined/month
- Priced per user per month with annual billing
- Unlimited users and history
- Full integration set and unified search
Sphinx
Free- SphinxFree
- Full functionality
- Commercial use permitted
- Community support
Which should you pick?
Choose Slab if
- You need topics instead of folders.
- You want to start without paying.
- You also want unified search.
Choose Sphinx if
- You need cross-references.
- You want to start without paying.
- You work on Linux, macOS, Windows.
- You also want api autodoc.
Questions people ask
- Is Slab or Sphinx better?
- Neither clearly leads. Slab starts at Free and Sphinx at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Slab or Sphinx?
- Slab starts at Free and Sphinx at Free.
- Does Slab or Sphinx run on more platforms?
- Slab runs on Web. Sphinx runs on Linux, macOS, Windows.
- Can I use Slab for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Slab best used for?
- Slab is most often used for building an employee handbook and onboarding path that new starters can actually find, replacing a folder-based wiki where nobody agrees which folder a document belongs in, companies whose knowledge is already spread across drive, slack and github and needs one search box, documenting process and decisions for teams that do not want a project management tool attached. Of those, building an employee handbook and onboarding path that new starters can actually find and replacing a folder-based wiki where nobody agrees which folder a document belongs in are not what Sphinx is typically brought in for.
- What can Slab do that Sphinx cannot?
- Slab covers Topics instead of folders, Unified search, Post verification, Quill editor. Sphinx covers Cross-references, API autodoc, Multi-format output, Extension ecosystem.
Answered from the vendors’ own pages
Slab: Can I publish documentation publicly with Slab?
Posts can be shared by link, but it is not a product documentation platform. There is no custom domain publishing, versioning or API reference tooling.
Sphinx: Is Sphinx free?
Yes, open source under the BSD licence.
Slab: What does the free plan actually cover?
Up to ten users with unlimited posts and core integrations. It is a real free tier rather than a trial, and it is enough for a small company handbook.
Sphinx: Do I have to write reStructuredText?
Not any more. The MyST extension allows Markdown, though reStructuredText remains the native format and most examples use it.
Slab: How does it compare with a general workspace tool?
Slab does less on purpose. There are no databases, boards or task views, which makes it faster to write in and much harder to turn into an unmaintained sprawl.
Sphinx: Why do large projects choose Sphinx?
Automatic cross-referencing and API extraction from docstrings, which lighter generators do not provide.
Slab: Does search really cover other tools?
Yes, connected sources are indexed and appear in results. That integration is the main reason to choose it, so verify your specific tools are supported before committing.
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