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Confluent Cloud vs Thanos

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
Thanos logo

Thanos

Cloud

Highly available Prometheus with long-term object storage

From
Free
Free plan
Yes
Visit ThanosFull review

The short version

  • Confluent Cloud is a managed Apache Kafka service billed.
  • Thanos is free; Confluent Cloud starts at $385/mo.
  • Where Confluent Cloud falls short: requires understanding of eCKU (Elastic Confluent Unit) billing.
  • Where Thanos falls short: several components — sidecar, store, querier, compactor, ruler — each with its own configuration and failure modes.
  • Prices and features on this page were last checked on 13 November 2026.

Where they differ

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

Attributes where Confluent Cloud and Thanos differ
AttributeConfluent CloudThanos
Pricing modelUsage-basedOpen source, no licence fee
PlatformsWebSelf-hosted, Linux

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 Thanos does not also cover.

Only in Thanos

  • Global query
  • Object storage retention
  • Deduplication
  • Downsampling

What people use each for

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

Confluent Cloud

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

Thanos

  • Querying metrics across many clusters or regions from one placenot Confluent Cloud
  • Retaining metrics for years without local disk growthnot Confluent Cloud
  • Removing the gap that appears when a single Prometheus instance restartsnot 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

Thanos

  • Several components — sidecar, store, querier, compactor, ruler — each with its own configuration and failure modes
  • The compactor is a common source of operational trouble and must not run twice against the same bucket
  • Query latency over object storage is meaningfully higher than local Prometheus
  • Object storage costs and API request charges become real at high volume

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

Thanos

Free
  • ThanosFree
    • Full functionality
    • No usage limits
    • Community support

Which should you pick?

Choose Confluent Cloud if

  • You want to start without paying.
Confluent Cloud review

Choose Thanos if

  • You need global query.
  • You want to start without paying.
  • You work on Self-hosted, Linux.
  • You also want object storage retention.
Thanos review

Questions people ask

Is Confluent Cloud or Thanos better?
Neither clearly leads. Confluent Cloud starts at Free and Thanos at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Confluent Cloud or Thanos?
Confluent Cloud starts at Free and Thanos at Free.
Does Confluent Cloud or Thanos run on more platforms?
Confluent Cloud runs on Web. Thanos runs on Self-hosted, Linux.
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 Thanos is typically brought in for.
What can Confluent Cloud do that Thanos cannot?
Thanos covers Global query, Object storage retention, Deduplication, Downsampling.

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
Thanos: Is Thanos free?

Yes, open source and CNCF-incubating. Costs are the object storage it uses.

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
Thanos: Does Thanos replace Prometheus?

No. It runs alongside existing Prometheus servers, adding global query, deduplication and long-term storage.

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
Thanos: Thanos or VictoriaMetrics?

Thanos layers onto Prometheus using object storage and is the more established multi-cluster answer. VictoriaMetrics is a separate store aiming at lower resource use and fewer moving parts.

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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