Softwr

Cloud · head to head

Fly.io vs Kubernetes

Fly.io logo

Fly.io

Cloud

Deploy web applications globally

From
$29/month
Rated
-
Full reviewWebsite
Kubernetes logo

Kubernetes

Technology

Production-grade container orchestration

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Kubernetes has a free tier, so it costs nothing to try first.
  • Each has a real cost: 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; Kubernetes complex initial setup and configuration with multiple interdependent components
  • They diverge on capability: Fly.io covers Global deployment, Kubernetes covers Container orchestration.

Where they differ

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

Attributes where Fly.io and Kubernetes differ
AttributeFly.ioKubernetes
Starting price$29/monthFree
Pricing modelusage-basedUnknown
Free tierNoYes
PlatformsWeb, Api, DockerLinux, Cloud (AWS, GCP, Azure)
CategoryCloudTechnology
Founded20202014

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 Fly.io

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

Only in Kubernetes

  • Container orchestration
  • Automatic scaling
  • Self-healing
  • Service discovery
  • Load balancing
  • Storage orchestration
  • Automated rollouts
  • Secret management

Both cover

  • Docker

What people use each for

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

Fly.io

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

Kubernetes

  • Microservices deploymentnot Fly.io
  • Cloud-native applicationsnot Fly.io
  • CI/CD pipelinesnot Fly.io
  • Multi-cloud deploymentsnot Fly.io
  • Edge computingnot Fly.io

Where each one falls short

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

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

Kubernetes

  • Complex initial setup and configuration with multiple interdependent components
  • Significant resource requirements for both hardware infrastructure and specialized human expertise
  • Expensive specialized talent in Kubernetes domain; hiring costs prohibitive for many organizations
  • New security challenges around container isolation and network security requiring robust measures
  • Requires continuous maintenance and updates to stay current with releases and security patches

Pricing, plan by plan

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

Kubernetes

Free

No published plan breakdown. See the Kubernetes review.

Which should you pick?

Choose Fly.io if

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

Choose Kubernetes if

  • You need container orchestration.
  • You want to start without paying.
  • You work on Linux, Cloud (AWS, GCP, Azure).
  • You also want automatic scaling.
Kubernetes review

Questions people ask

Is Fly.io or Kubernetes better?
Neither clearly leads. Fly.io starts at $29/month and Kubernetes at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fly.io or Kubernetes?
Kubernetes has a free tier; the other does not. Paid plans start at $29/month for Fly.io and Free for Kubernetes.
Does Fly.io or Kubernetes run on more platforms?
Fly.io runs on Web, Api, Docker. Kubernetes runs on Linux, Cloud (AWS, GCP, Azure).
Can I use Kubernetes for free?
Yes. Kubernetes has a free tier, so you can try it without paying. Fly.io starts at $29/month.
What is Fly.io best used for?
Fly.io is most often used for deploying containerised applications close to users across regions, running full stack apps and databases on managed machines. Of those, deploying containerised applications close to users across regions and running full stack apps and databases on managed machines are not what Kubernetes is typically brought in for.
What can Fly.io do that Kubernetes cannot?
Fly.io covers Global deployment, Docker support, Postgres databases, Redis support. Kubernetes covers Container orchestration, Automatic scaling, Self-healing, Service discovery. Both handle Docker.

Answered from the vendors’ own 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
Kubernetes: What is Kubernetes used for?

Kubernetes is a container orchestration platform that automates deployment, scaling, and management of containerized applications across clusters of machines.

Source
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
Kubernetes: Is Kubernetes free?

Yes, Kubernetes is free, open-source software maintained by the Cloud Native Computing Foundation. However, running Kubernetes clusters requires infrastructure investment.

Source
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
Kubernetes: How hard is it to learn Kubernetes?

Kubernetes has a steep learning curve. It requires deep knowledge of containerization, networking, and distributed systems. Teams without prior container experience should expect significant training time.

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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