Cloud · head to head
containerd vs Fly.io
containerd
Cloud
Industry-standard container runtime, and the engine inside Docker
- From
- Free
- Rated
- -
The short version
- Only containerd has a free tier, so it costs nothing to try first.
- Each has a real cost: containerd not a developer-facing tool: there is no build command and the CLI is deliberately minimal, so it needs companions like nerdctl or Buildah; 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: containerd covers Full container lifecycle, Fly.io covers Global deployment.
Where they differ
Only the attributes on which containerd and Fly.io actually diverge.
| Attribute | containerd | Fly.io |
|---|---|---|
| Starting price | Free | $29/month |
| Pricing model | Open source, no licence fee | usage-based |
| Free tier | Yes | No |
| Platforms | Linux, Windows | Web, Api, Docker |
| Founded | Unknown | 2020 |
Identical on both: user rating (Not yet rated), category (Cloud).
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 containerd
- Full container lifecycle
- CRI support
- OCI compliant
- Snapshotter plugins
- Namespaces
- Stable 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.
containerd
- Running the container runtime under a Kubernetes cluster after the Docker shim removalnot Fly.io
- Building a platform or PaaS that needs to execute containersnot Fly.io
- Reducing the moving parts on nodes that only ever run Kubernetes workloadsnot Fly.io
- Embedding container execution inside another productnot Fly.io
Fly.io
- Deploying containerised applications close to users across regionsnot containerd
- Running full stack apps and databases on managed machinesnot containerd
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
containerd
- Not a developer-facing tool: there is no build command and the CLI is deliberately minimal, so it needs companions like nerdctl or Buildah
- Debugging is lower-level than Docker, and error messages assume knowledge of the runtime internals
- Documentation is aimed at platform engineers, so newcomers usually find Docker or Podman material more useful
- No image building at all — that is out of scope by design
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
containerd
Free- containerdFree
- Full functionality
- No usage limits
- 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 containerd if
- You need full container lifecycle.
- You want to start without paying.
- You work on Linux, Windows.
- You also want cri support.
Choose Fly.io if
- You need global deployment.
- You work on Web, Api, Docker.
- You also want docker support.
Questions people ask
- Is containerd or Fly.io better?
- Neither clearly leads. containerd 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, containerd or Fly.io?
- containerd has a free tier; the other does not. Paid plans start at Free for containerd and $29/month for Fly.io.
- Does containerd or Fly.io run on more platforms?
- containerd runs on Linux, Windows. Fly.io runs on Web, Api, Docker.
- Can I use containerd for free?
- Yes. containerd has a free tier, so you can try it without paying. Fly.io starts at $29/month.
- What is containerd best used for?
- containerd is most often used for running the container runtime under a kubernetes cluster after the docker shim removal, building a platform or paas that needs to execute containers, reducing the moving parts on nodes that only ever run kubernetes workloads, embedding container execution inside another product. Of those, running the container runtime under a kubernetes cluster after the docker shim removal and building a platform or paas that needs to execute containers are not what Fly.io is typically brought in for.
- What can containerd do that Fly.io cannot?
- containerd covers Full container lifecycle, CRI support, OCI compliant, Snapshotter plugins. Fly.io covers Global deployment, Docker support, Postgres databases, Redis support.
Answered from the vendors’ own pages
containerd: Is containerd free?
Yes. It is an open-source CNCF graduated project with no licence fee.
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.
Sourcecontainerd: Do I need containerd if I use Docker?
You already have it. Docker uses containerd underneath to run containers; it is not an alternative you install separately.
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.
Sourcecontainerd: Why did Kubernetes drop Docker for containerd?
Kubernetes talks to runtimes through the Container Runtime Interface. Docker did not speak CRI natively and needed a shim, so Kubernetes removed the shim and talks to containerd directly, which Docker was already using anyway.
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.
Sourcecontainerd: Can containerd build images?
No. Image building is deliberately out of scope. Tools such as Buildah, BuildKit or Docker handle that.
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.
SourceRelated pages
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