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Docsify vs Preact

Docsify logo

Docsify

Documentation

Documentation site generator that renders markdown in the browser with no build step and no generated HTML

From
Free
Rated
-
Full reviewWebsite
Preact logo

Preact

Web Development

3kB alternative to React with the same modern API

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Docsify pages are assembled by JavaScript at runtime, so search engines and crawlers that do not execute scripts see an empty shell, which makes it unsuitable for documentation that must be found through search.; Preact compatibility through preact/compat is good but not total, and some React libraries break in ways that are hard to diagnose
  • They diverge on capability: Docsify covers No build step, Preact covers 3kB runtime.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Docsify and Preact actually diverge.

Attributes where Docsify and Preact differ
AttributeDocsifyPreact
PlatformsWeb, Self-hosted, GitHub Pages, Netlify, VercelWeb
CategoryDocumentationWeb Development

Identical on both: starting price (Free), pricing model (Open source, no licence fee), free tier (Yes), user rating (Not yet rated).

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 Docsify

  • No build step
  • Single HTML entry point
  • Client-side full-text search
  • Plugin ecosystem
  • Themeable
  • docsify-cli

Only in Preact

  • 3kB runtime
  • preact/compat
  • Same modern API
  • Fast rendering

What people use each for

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

Docsify

  • Turning a repository docs folder into a browsable site with no pipeline to maintainnot Preact
  • Internal documentation behind authentication where search engine indexing is irrelevantnot Preact
  • Small open-source projects that want more than a README and less than a static site generatornot Preact
  • Prototyping documentation structure before committing to a heavier toolchainnot Preact

Preact

  • Embedded widgets that load inside someone else’s page and must stay smallnot Docsify
  • Marketing and content sites where JavaScript payload affects Core Web Vitalsnot Docsify
  • Applications targeting low-bandwidth or low-powered devicesnot Docsify

Where each one falls short

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

Docsify

  • Pages are assembled by JavaScript at runtime, so search engines and crawlers that do not execute scripts see an empty shell, which makes it unsuitable for documentation that must be found through search.
  • Every page view fetches markdown files over the network and renders them client-side, so on slow connections the site is visibly slower than pre-generated HTML.
  • Full-text search is built in the browser from all your documents, and the index becomes slow to build and heavy to hold once a site grows past a few dozen pages.
  • There is no built-in versioning, so supporting several releases of a product means directory conventions and hand-maintained sidebars.
  • The plugin ecosystem is loaded through script tags with no dependency management, so plugins break silently against new core versions and there is no build to catch it.

Preact

  • Compatibility through preact/compat is good but not total, and some React libraries break in ways that are hard to diagnose
  • Behavioural differences from React exist in edge cases, particularly around event handling
  • A much smaller community, so unusual problems have fewer existing answers than React

Pricing, plan by plan

Docsify

Free
  • DocsifyFree
    • MIT licensed
    • No build infrastructure required
    • All plugins and themes free

Preact

Free
  • PreactFree
    • Full library
    • Commercial use permitted
    • No usage limits

Which should you pick?

Choose Docsify if

  • You need no build step.
  • You want to start without paying.
  • You work on Web, Self-hosted, GitHub Pages, Netlify, Vercel.
  • You also want single html entry point.
Docsify review

Choose Preact if

  • You need 3kb runtime.
  • You want to start without paying.
  • You also want preact/compat.
Preact review

Questions people ask

Is Docsify or Preact better?
Neither clearly leads. Docsify starts at Free and Preact at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Docsify or Preact?
Docsify starts at Free and Preact at Free.
Does Docsify or Preact run on more platforms?
Docsify runs on Web, Self-hosted, GitHub Pages, Netlify, Vercel. Preact runs on Web.
Can I use Docsify for free?
Both have a free tier, so you can try either at no cost before committing.
What is Docsify best used for?
Docsify is most often used for turning a repository docs folder into a browsable site with no pipeline to maintain, internal documentation behind authentication where search engine indexing is irrelevant, small open-source projects that want more than a readme and less than a static site generator, prototyping documentation structure before committing to a heavier toolchain. Of those, turning a repository docs folder into a browsable site with no pipeline to maintain and internal documentation behind authentication where search engine indexing is irrelevant are not what Preact is typically brought in for.
What can Docsify do that Preact cannot?
Docsify covers No build step, Single HTML entry point, Client-side full-text search, Plugin ecosystem. Preact covers 3kB runtime, preact/compat, Same modern API, Fast rendering.

Answered from the vendors’ own pages

Docsify: Is Docsify bad for SEO?

Yes, by design. There is no static HTML for a crawler to read unless you add prerendering, which reintroduces the build step the tool exists to avoid. Choose a static generator if search traffic matters.

Preact: Is Preact free?

Yes, open source under the MIT licence.

Docsify: Does it need Node.js to run?

Only for the local preview command. The published site is static files served by any web server, including GitHub Pages.

Preact: Can I use React libraries with Preact?

Most, through the preact/compat layer. Compatibility is good but not complete, so libraries relying on React internals can break.

Docsify: How large a documentation set can it handle?

Comfortably a few dozen pages. Beyond that, client-side search and sidebar maintenance become the limiting factors rather than rendering speed.

Preact: Why choose Preact over React?

Bundle size, almost always. If payload is not a binding constraint, React’s ecosystem is usually the better trade.

Docsify: Can I add versioned documentation?

Not natively. The usual approach is a directory per version with its own sidebar, maintained manually.

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