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Confluent Cloud vs Longhorn

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
Longhorn logo

Longhorn

Cloud

Open source distributed block storage for Kubernetes, incubating at the CNCF

From
Free
Free plan
Yes
Visit LonghornFull review

The short version

  • Confluent Cloud is a managed Apache Kafka service billed.
  • Longhorn is free; Confluent Cloud starts at $385/mo.
  • Where Confluent Cloud falls short: requires understanding of eCKU (Elastic Confluent Unit) billing.
  • Prices and features on this page were last checked on 13 November 2026.

Where they differ

Only the attributes on which Confluent Cloud and Longhorn actually diverge.

Attributes where Confluent Cloud and Longhorn differ
AttributeConfluent CloudLonghorn
Pricing modelUsage-basedOpen source, no licence fee
PlatformsWebLinux, Self-hosted

Identical on both: starting price (Free), free tier (Yes), 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 Confluent Cloud

Nothing recorded that Longhorn does not also cover.

Only in Longhorn

  • Per-volume controllers
  • Synchronous replication
  • Snapshots and backups
  • Volume expansion
  • Disaster recovery volumes
  • Web interface

What people use each for

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

Confluent Cloud

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

Longhorn

  • An on-premises Kubernetes cluster with local disks and no SAN that needs replicated persistent volumesnot Confluent Cloud
  • Edge sites where shipping a storage array is impractical and three nodes is the whole clusternot Confluent Cloud
  • A K3s deployment where the storage layer must be light enough to run alongside the workloadsnot Confluent Cloud
  • A team that wants snapshots and S3 backups of persistent volumes without paying per-node storage licencesnot 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

Longhorn

  • There is no vendor and no SLA, so a production incident at three in the morning is your own problem unless you buy SUSE Rancher Prime support separately
  • Synchronous replication across nodes means write latency depends on the slowest replica and the network between nodes, which makes it a poor fit for latency-sensitive databases
  • Every replica is a full copy, so three-way replication consumes three times the raw capacity, unlike erasure-coded systems that are far more space efficient
  • It is designed for block storage on modest clusters and does not scale to the node counts or throughput that Ceph or a commercial array handles, so growth eventually forces a migration
  • Recovery from certain degraded states, such as a volume stuck detaching or replicas failing to rebuild, requires manual intervention and knowledge of Longhorn internals that is not widely held

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

Longhorn

Free
  • LonghornFree
    • Apache 2.0 licensed, no licence fee
    • Community support via GitHub and Slack only
    • No vendor SLA or escalation path

Which should you pick?

Choose Confluent Cloud if

  • You want to start without paying.
Confluent Cloud review

Choose Longhorn if

  • You need per-volume controllers.
  • You want to start without paying.
  • You work on Linux, Self-hosted.
  • You also want synchronous replication.
Longhorn review

Questions people ask

Is Confluent Cloud or Longhorn better?
Neither clearly leads. Confluent Cloud starts at Free and Longhorn at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Confluent Cloud or Longhorn?
Confluent Cloud starts at Free and Longhorn at Free.
Does Confluent Cloud or Longhorn run on more platforms?
Confluent Cloud runs on Web. Longhorn runs on Linux, Self-hosted.
Can I use Confluent Cloud for free?
Both have a free tier, so you can try either at no cost before committing.
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 Longhorn is typically brought in for.
What can Confluent Cloud do that Longhorn cannot?
Longhorn covers Per-volume controllers, Synchronous replication, Snapshots and backups, Volume expansion.

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
Longhorn: Who do we call when it breaks?

Nobody, unless you buy SUSE Rancher Prime, which includes commercial support for Longhorn. This is the decisive question for production use.

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
Longhorn: How much capacity does replication cost?

Full copies, so three replicas means three times the raw capacity. Budget accordingly rather than assuming erasure coding efficiency.

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
Longhorn: Is it suitable for production databases?

For modest workloads yes, but synchronous replication adds write latency and high-transaction databases usually want something faster.

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
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