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Web Development · head to head

esbuild vs Fly.io

esbuild logo

esbuild

Web Development

Extremely fast JavaScript bundler written in Go

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 esbuild has a free tier, so it costs nothing to try first.
  • Each has a real cost: esbuild deliberately does not type-check TypeScript, only strips types, so tsc still runs separately; 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: esbuild covers Very fast builds, Fly.io covers Global deployment.

Where they differ

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

Attributes where esbuild and Fly.io differ
AttributeesbuildFly.io
Starting priceFree$29/month
Pricing modelOpen source, no licence feeusage-based
Free tierYesNo
PlatformsLinux, macOS, WindowsWeb, 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 esbuild

  • Very fast builds
  • TypeScript support
  • Tree shaking and minification
  • Simple API

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.

esbuild

  • Build pipelines where bundle time is the bottlenecknot Fly.io
  • Libraries and tools needing a fast, embeddable bundlernot Fly.io
  • Replacing slower bundlers where the plugin ecosystem is not needednot Fly.io

Fly.io

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

Where each one falls short

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

esbuild

  • Deliberately does not type-check TypeScript, only strips types, so tsc still runs separately
  • Plugin API is far narrower than webpack or Rollup, and complex builds hit its limits
  • Code splitting support has historically lagged the more established bundlers
  • Frequently used indirectly through Vite, so direct use is a narrower need than the download numbers suggest

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

esbuild

Free
  • esbuildFree
    • Full functionality
    • Commercial use permitted
    • Community support

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 esbuild if

  • You need very fast builds.
  • You want to start without paying.
  • You work on Linux, macOS, Windows.
  • You also want typescript support.
esbuild 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 esbuild or Fly.io better?
Neither clearly leads. esbuild 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, esbuild or Fly.io?
esbuild has a free tier; the other does not. Paid plans start at Free for esbuild and $29/month for Fly.io.
Does esbuild or Fly.io run on more platforms?
esbuild runs on Linux, macOS, Windows. Fly.io runs on Web, Api, Docker.
Can I use esbuild for free?
Yes. esbuild has a free tier, so you can try it without paying. Fly.io starts at $29/month.
What is esbuild best used for?
esbuild is most often used for build pipelines where bundle time is the bottleneck, libraries and tools needing a fast, embeddable bundler, replacing slower bundlers where the plugin ecosystem is not needed. Of those, build pipelines where bundle time is the bottleneck and libraries and tools needing a fast, embeddable bundler are not what Fly.io is typically brought in for.
What can esbuild do that Fly.io cannot?
esbuild covers Very fast builds, TypeScript support, Tree shaking and minification, Simple API. Fly.io covers Global deployment, Docker support, Postgres databases, Redis support.

Answered from the vendors’ own pages

esbuild: Is esbuild free?

Yes, open source under the MIT licence.

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
esbuild: Does esbuild type-check TypeScript?

No. It strips types for speed and does not check them. Run tsc separately if you need type checking.

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
esbuild: Do I need esbuild if I use Vite?

You already have it. Vite uses esbuild internally for dependency pre-bundling and transforms.

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
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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