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Confluent Cloud vs Envoy

Confluent Cloud logo

Confluent Cloud

Technology

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

From
Free
Rated
-
Full reviewWebsite
Envoy logo

Envoy

Technology

A high-performance L7 proxy written in C++ that is configured by an API rather than a config file, and is usually deployed under a control plane.

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Confluent Cloud requires understanding of eCKU (Elastic Confluent Unit) billing; Envoy the configuration surface is very large and hand-written bootstrap YAML runs to hundreds of lines for routing that Nginx expresses in twenty, which is why nearly every production deployment sits under a control plane and inherits that control plane's constraints as well.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

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

Attributes where Confluent Cloud and Envoy differ
AttributeConfluent CloudEnvoy
Pricing modelusage-basedopen-source

Identical on both: starting price (Free), free tier (Yes), platforms (Web), user rating (Not yet rated), category (Technology).

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 Envoy does not also cover.

Only in Envoy

  • xDS dynamic configuration
  • Protocol breadth
  • Filter chain architecture
  • Observability by default
  • Outlier detection
  • Traffic shaping
  • mTLS termination and origination
  • Hot restart

What people use each for

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

Confluent Cloud

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

Envoy

  • Acting as the data plane under a service mesh or Gateway API implementation, which is how the overwhelming majority of deployments use itnot Confluent Cloud
  • An edge or API gateway that needs per-route retry budgets, circuit breaking and outlier detection rather than round-robin proxyingnot Confluent Cloud
  • Migrating traffic between service versions or between a monolith and its replacement, using weighted splits and shadow trafficnot Confluent Cloud
  • Standardising observability across a polyglot estate, so that latency, error rates and tracing look the same regardless of the language a service is written innot 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

Envoy

  • The configuration surface is very large and hand-written bootstrap YAML runs to hundreds of lines for routing that Nginx expresses in twenty, which is why nearly every production deployment sits under a control plane and inherits that control plane's constraints as well.
  • xDS is the real API and it is not stable in the comfortable sense; the v2 API set was removed outright, resource types continue to be deprecated, and your control plane and Envoy binaries have to be upgraded roughly in step or the proxies stop accepting configuration.
  • Extending it properly means writing a C++ filter and building and maintaining your own Envoy binary; the alternatives are Lua, which adds per-request overhead, and proxy-wasm, whose ABI has remained effectively experimental for years with a real performance cost.
  • At sidecar density the per-proxy memory and CPU footprint is a measurable share of cluster capacity, since thousands of workloads each carry a full proxy, and this is precisely the cost that has pushed mesh projects towards node-level or ambient architectures.
  • There is no single vendor selling support for Envoy itself; you get the community plus control-plane vendors such as Solo.io and Tetrate, so an Envoy-level production bug is your own engineers in a C++ codebase unless a support contract happens to cover it.
  • Diagnosing why a request got a particular response involves reading config dumps, the stats endpoint and the RESPONSE_FLAGS codes in access logs rather than a readable error, which is a specific skill you must hire or spend months growing.

Pricing, plan by plan

Confluent Cloud

Free
  • BasicFree
    • Free first eCKU
    • Then $0.14 per eCKU-hour
    • 99.5% uptime
  • Standard$385/month
    • $0.75 per eCKU-hour
    • 99.99% uptime with 2+ eCKUs
    • Infinite storage
  • Enterprise$895/month
    • $1.75-$2.25 per eCKU-hour
    • Private networking
    • GBps+ scaling
  • Freight$2300/month
    • $2.25 per eCKU-hour
    • Specialty logging tier
    • Highest throughput requirements

Envoy

Free

No published plan breakdown. See the Envoy review.

Which should you pick?

Choose Confluent Cloud if

  • You want to start without paying.
Confluent Cloud review

Choose Envoy if

  • You need xds dynamic configuration.
  • You want to start without paying.
  • You also want protocol breadth.
Envoy review

Questions people ask

Is Confluent Cloud or Envoy better?
Neither clearly leads. Confluent Cloud starts at Free and Envoy at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Confluent Cloud or Envoy?
Confluent Cloud starts at Free and Envoy at Free.
Does Confluent Cloud or Envoy run on more platforms?
Both run on Web, so platform support will not decide this one for you.
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 Envoy is typically brought in for.
What can Confluent Cloud do that Envoy cannot?
Envoy covers xDS dynamic configuration, Protocol breadth, Filter chain architecture, Observability by default.

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
Envoy: Should I run Envoy on its own, or under a control plane?

Almost always under one. Directly authoring xDS or static bootstrap configuration is viable for a handful of routes and becomes unmanageable beyond that. Envoy Gateway, Istio, Contour, Gloo and Consul all exist to generate that configuration for you.

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
Envoy: How does it compare with Nginx or HAProxy?

Envoy is dynamically configured over an API and instrumented far more heavily; Nginx and HAProxy are faster to configure and lighter for straightforward reverse proxying. If you never need to change routing without a reload, Envoy is more machinery than the problem requires.

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
Envoy: What does it cost?

Nothing to licence; it is Apache 2.0 and there is no paid edition. The cost is engineering time and, for most organisations, a commercial control plane or cloud service that packages it.

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
Envoy: Can I write extensions without C++?

You can write Lua filters or proxy-wasm modules in Rust, Go, C++ or AssemblyScript. Both carry per-request overhead compared with a native filter, and the Wasm path has been slower to stabilise than the project originally projected.

Envoy: Is it a CNCF project?

Yes, it is a graduated CNCF project licensed under Apache 2.0, which means the trademark and governance sit with the foundation rather than with Lyft or any vendor.

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