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Web Development · head to head

Docusaurus vs Fly.io

Docusaurus logo

Docusaurus

Web Development

Static site generator from Meta for documentation sites

From
Free
Rated
-
Full reviewWebsite
Fly.io logo

Fly.io

Cloud

Deploy web applications globally

From
$29/month
Rated
-
Full reviewWebsite

The short version

  • Only Docusaurus has a free tier, so it costs nothing to try first.
  • Each has a real cost: Docusaurus customisation past the config file assumes React knowledge, which not every docs team has; Fly.io egress is priced by destination region, from $0.02 per GB in North America and Europe to $0.12 per GB for Africa and India, so the same traffic costs six times more depending on where users are
  • They diverge on capability: Docusaurus covers MDX authoring, Fly.io covers Global deployment.

Where they differ

Only the attributes on which Docusaurus and Fly.io actually diverge.

Attributes where Docusaurus and Fly.io differ
AttributeDocusaurusFly.io
Starting priceFree$29/month
Pricing modelOpen source, no licence fee; hosting billed separatelyusage-based
Free tierYesNo
PlatformsWeb, Self-hosted, Node.jsWeb, Api, Docker
CategoryWeb DevelopmentCloud
FoundedUnknown2020

Identical on both: 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 Docusaurus

  • MDX authoring
  • Docs versioning
  • Internationalisation
  • Algolia search
  • React theming
  • Plugin architecture

Only in Fly.io

  • Global deployment
  • Docker support
  • Postgres databases
  • Redis support
  • Auto-scaling
  • Health checks
  • Backups
  • Monitoring

What people use each for

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

Docusaurus

  • Open-source project documentation that must track several released versionsnot Fly.io
  • Docs sites needing translation workflows rather than a single languagenot Fly.io
  • Teams already writing React who want to extend the docs theme directlynot Fly.io
  • Replacing a hand-rolled docs site with something that handles search and versioningnot Fly.io

Fly.io

  • Deploying containerised applications close to users across regionsnot Docusaurus
  • Running full stack apps and databases on managed machinesnot Docusaurus

Where each one falls short

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

Docusaurus

  • Customisation past the config file assumes React knowledge, which not every docs team has
  • Build times grow noticeably on very large sites, particularly with many versions and locales
  • Major version upgrades have required real migration work rather than a dependency bump
  • It generates a static site, so anything dynamic — gated content, per-user docs — needs a separate solution

Fly.io

  • Egress is priced by destination region, from $0.02 per GB in North America and Europe to $0.12 per GB for Africa and India, so the same traffic costs six times more depending on where users are
  • Stopped machines still bill at $0.15 per GB of root filesystem a month, so a paused service is not a free one
  • Volumes are billed on provisioned capacity rather than usage, at $0.15 per GB a month
  • Reservation discounts of 40% require paying a year up front, from $36 to $1,440
  • Fly Kubernetes is a separate $75 a month per cluster
  • Dedicated IPv4 addresses are $2 a month each

Pricing, plan by plan

Docusaurus

Free
  • DocusaurusFree
    • Full generator
    • Versioning
    • Internationalisation

Fly.io

$29/month
  • Pay-as-You-Go$null/mo
    • Micro VMs and persistent storage charged by usage
    • FlyCTL CLI
    • Unlimited users and organizations
  • Serious Support$29/month
    • Access to dedicated engineering team
    • All Pay-as-You-Go features
  • Machine Reservation Blocks$null/mo
    • 40% discount on machine usage
    • Requires upfront payment for savings
  • Compliance Package$99/month
    • HIPAA compliance
    • BAAs
    • SOC2 documentation

Which should you pick?

Choose Docusaurus if

  • You need mdx authoring.
  • You want to start without paying.
  • You work on Web, Self-hosted, Node.js.
  • You also want docs versioning.
Docusaurus review

Choose Fly.io if

  • You need global deployment.
  • You work on Web, Api, Docker.
  • You also want docker support.
Fly.io review

Questions people ask

Is Docusaurus or Fly.io better?
Neither clearly leads. Docusaurus starts at Free and Fly.io at $29/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Docusaurus or Fly.io?
Docusaurus has a free tier; the other does not. Paid plans start at Free for Docusaurus and $29/month for Fly.io.
Does Docusaurus or Fly.io run on more platforms?
Docusaurus runs on Web, Self-hosted, Node.js. Fly.io runs on Web, Api, Docker.
Can I use Docusaurus for free?
Yes. Docusaurus has a free tier, so you can try it without paying. Fly.io starts at $29/month.
What is Docusaurus best used for?
Docusaurus is most often used for open-source project documentation that must track several released versions, docs sites needing translation workflows rather than a single language, teams already writing react who want to extend the docs theme directly, replacing a hand-rolled docs site with something that handles search and versioning. Of those, open-source project documentation that must track several released versions and docs sites needing translation workflows rather than a single language are not what Fly.io is typically brought in for.
What can Docusaurus do that Fly.io cannot?
Docusaurus covers MDX authoring, Docs versioning, Internationalisation, Algolia search. Fly.io covers Global deployment, Docker support, Postgres databases, Redis support.

Answered from the vendors’ own pages

Docusaurus: Is Docusaurus free?

Yes. Docusaurus is open source from Meta with no licence fee. You pay only for hosting, and static output can be served from free tiers on Netlify, Vercel or GitHub Pages.

Fly.io: Is there a free tier for Fly.io?

Fly.io does not advertise a free tier. The base plan is pay-as-you-go with usage-based pricing for Micro VMs and persistent storage. All users get FlyCTL CLI, unlimited organizations, private networking, SSO, ACLs, and scoped tokens.

Source
Docusaurus: What is Docusaurus built with?

React and MDX. Pages are authored in MDX — Markdown that can embed React components — and the theme layer is React, so layouts are extended with components.

Fly.io: How much does Fly.io Serious Support cost?

Serious Support costs 29 USD per month and provides access to a dedicated engineering team while maintaining all pay-as-you-go features for Micro VMs and storage.

Source
Docusaurus: Does Docusaurus support multiple documentation versions?

Yes. Versioning is built in, so documentation for several released product versions can be maintained side by side, which is a main reason projects choose it.

Fly.io: What does Fly.io Compliance Package include?

The Compliance Package is 99 USD per month and includes HIPAA compliance, BAAs, and SOC2 documentation for organizations requiring compliance certifications.

Source
Docusaurus: Does Docusaurus include search?

It integrates with Algolia DocSearch rather than shipping its own search index. Open-source projects can typically use Algolia’s free DocSearch programme.

Fly.io: Does Fly.io offer discounts for upfront commitment?

Yes, Fly.io offers Machine Reservation Blocks with 40% discount on machine usage. This requires upfront payment but applies savings on infrastructure costs.

Source
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