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Cloud · head to head

Confluent Cloud vs Fly.io

Confluent Cloud logo

Confluent Cloud

Cloud

The data streaming platform built on Apache Kafka, delivered as a fully managed cloud service

From
Free
Free plan
Yes
Visit Confluent CloudFull review
Fly.io logo

Fly.io

Cloud

Deploy web applications globally

From
$29/month
Free plan
No
Visit Fly.ioFull review

The short version

  • Confluent Cloud is a managed Apache Kafka service billed.
  • Confluent Cloud has a free plan, then $385/mo; Fly.io starts at $29/mo.
  • Where Confluent Cloud falls short: requires understanding of eCKU (Elastic Confluent Unit) billing.
  • Where Fly.io falls short: stopped machines still bill at $0.15 per GB of root filesystem a month, so a paused service is not a free one.
  • Prices and features on this page were last checked on 13 November 2026.

Where they differ

Only the attributes on which Confluent Cloud and Fly.io actually diverge.

Attributes where Confluent Cloud and Fly.io differ
AttributeConfluent CloudFly.io
Starting priceFree$29/month
Free tierYesNo
PlatformsWebWeb, API, Self-hosted

Identical on both: pricing model (Usage-based), category (Cloud).

Not yet recorded: founded for Confluent 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 Confluent Cloud

Nothing recorded that Fly.io does not also cover.

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.

Confluent Cloud

  • Apache Kafka event streaming and processingnot Fly.io
  • Real-time data pipeline architecturenot Fly.io
  • Multi-cloud event broker deploymentnot Fly.io
  • Stream processing and analyticsnot Fly.io
  • Microservices data synchronizationnot Fly.io

Fly.io

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

Where each one falls short

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

Confluent Cloud

  • Requires understanding of eCKU (Elastic Confluent Unit) billing
  • Data in/egress costs add $0.014-$0.050 per GB
  • Storage costs of $0.03-$0.08 per GB-month
  • Minimum commitment recommended for cost optimization

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

Confluent Cloud

Free
  • BasicFree
    • Free first eCKU
    • Then $0.14 per eCKU-hour
    • 99.5% uptime
  • Standard$385/mo
    • $0.75 per eCKU-hour
    • 99.99% uptime with 2+ eCKUs
    • Infinite storage
  • Enterprise$895/mo
    • $1.75-$2.25 per eCKU-hour
    • Private networking
    • GBps+ scaling
  • Freight$2,300/mo
    • $2.25 per eCKU-hour
    • Specialty logging tier
    • Highest throughput requirements

Fly.io

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

Which should you pick?

Choose Confluent Cloud if

  • You want to start without paying.
Confluent Cloud review

Choose Fly.io if

  • You need global deployment.
  • You work on Web, API, Self-hosted.
  • You also want docker support.
Fly.io review

Questions people ask

Is Confluent Cloud or Fly.io better?
Neither clearly leads. Confluent Cloud 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, Confluent Cloud or Fly.io?
Confluent Cloud has a free tier; the other does not. Paid plans start at Free for Confluent Cloud and $29/month for Fly.io.
Does Confluent Cloud or Fly.io run on more platforms?
Confluent Cloud runs on Web. Fly.io runs on Web, API, Self-hosted.
Can I use Confluent Cloud for free?
Yes. Confluent Cloud has a free tier, so you can try it without paying. Fly.io starts at $29/month.
What is Confluent Cloud best used for?
Confluent Cloud is most often used for apache kafka event streaming and processing, real-time data pipeline architecture, multi-cloud event broker deployment, stream processing and analytics. Of those, apache kafka event streaming and processing and real-time data pipeline architecture are not what Fly.io is typically brought in for.
What can Confluent Cloud do that Fly.io cannot?
Fly.io covers Global deployment, Docker support, Postgres databases, Redis support.

Answered from the vendors’ own pages

Confluent Cloud: How much does Confluent Cloud cost?

Confluent Cloud pricing starts free on Basic tier with $0.14 per eCKU-hour, Standard at $0.75 per eCKU-hour (~$385/month base), Enterprise at $1.75-$2.25 per eCKU-hour (~$895/month base), and Freight specialty tier at $2.25 per eCKU-hour (~$2300/month).

Source
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
Confluent Cloud: Is there a free tier for Confluent Cloud?

Yes, the Basic tier is free with one eCKU credit included. Additional usage is billed at $0.14 per eCKU-hour, plus data transfer and storage fees apply.

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
Confluent Cloud: What additional fees does Confluent Cloud charge?

Beyond eCKU hours, Confluent charges data in/egress at $0.014-$0.050 per GB and storage at $0.03-$0.08 per GB-month. Costs vary by tier and region.

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
Confluent Cloud: Does Confluent offer discounts for higher usage?

Yes, volume discounts are negotiated upfront based on annual consumption estimates. Annual commitments allow flexible cross-product allocation with guaranteed cost savings.

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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