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Elastic Stack vs Fluentd

Elastic Stack logo

Elastic Stack

Software

Search, Observability, and Security Solutions

From
On request
Rated
-
Full reviewWebsite
Fluentd logo

Fluentd

Software

Open Source Data Collector for Unified Logging

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Fluentd has a free tier, so it costs nothing to try first.
  • Each has a real cost: Elastic Stack self-managed deployment requires licensing based on node count and RAM usage; Fluentd fluentd needs more than 60 MB of memory at runtime, against roughly 450 KB for Fluent Bit
  • They diverge on capability: Elastic Stack covers Full-text search, Fluentd covers Log collection.

Where they differ

Only the attributes on which Elastic Stack and Fluentd actually diverge.

Attributes where Elastic Stack and Fluentd differ
AttributeElastic StackFluentd
Starting priceOn requestFree
Pricing modelsubscriptionopen-source
Free tierNoYes
PlatformsCloud-hosted, Self-managed, Docker, Kubernetes (ECK)Web, Api

Identical on both: user rating (Not yet rated), category (Unknown), founded (2011).

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 Elastic Stack

  • Full-text search
  • Log analytics
  • Security monitoring
  • Alerting

Only in Fluentd

  • Log collection
  • Data parsing
  • Filtering and buffering
  • Event routing

Both cover

  • API
  • Webhooks
  • REST
  • Web support
  • Api support

What people use each for

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

Elastic Stack

  • Distributed search and analytics engine for production-scale workloadsnot Fluentd
  • Full-text search and vector search with approximate nearest neighbour supportnot Fluentd
  • Security event tracking with field-level and document-level access controlnot Fluentd
  • Machine learning capabilities including anomaly detection and forecastingnot Fluentd

Fluentd

  • Unified log collection and routing from many sources to many destinationsnot Elastic Stack
  • Parsing and transforming log records before forwardingnot Elastic Stack
  • Aggregating logs from containers into Elasticsearch, S3 or a SIEMnot Elastic Stack

Where each one falls short

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

Elastic Stack

  • Self-managed deployment requires licensing based on node count and RAM usage
  • Serverless option has pending features including traffic filtering and bring-your-own-key encryption
  • Hosted deployment requires custom resource configuration for cluster management
  • Pricing models differ significantly across Hosted, Serverless, and Self-managed options

Fluentd

  • Fluentd needs more than 60 MB of memory at runtime, against roughly 450 KB for Fluent Bit
  • Fluentd is built as a Ruby gem and depends on other gems, so a Ruby runtime is required
  • Its capability comes from over 1,000 external plugins rather than built in functionality, so each added input or output is a separate dependency
  • The Fluent Bit documentation states that cloud providers have switched from Fluentd to Fluent Bit for performance and compatibility and calls Fluent Bit the next generation solution

Pricing, plan by plan

Elastic Stack

On request

No published plan breakdown. See the Elastic Stack review.

Fluentd

Free
  • FreeFree
    • Log collection
    • Data parsing
    • Filtering and buffering

Which should you pick?

Choose Elastic Stack if

  • You need full-text search.
  • You work on Cloud-hosted, Self-managed, Docker, Kubernetes (ECK).
  • You also want log analytics.
Elastic Stack review

Choose Fluentd if

  • You need log collection.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want data parsing.
Fluentd review

Questions people ask

Is Elastic Stack or Fluentd better?
Neither clearly leads. Elastic Stack starts at On request and Fluentd at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Elastic Stack or Fluentd?
Fluentd has a free tier; the other does not. Paid plans start at On request for Elastic Stack and Free for Fluentd.
Does Elastic Stack or Fluentd run on more platforms?
Elastic Stack runs on Cloud-hosted, Self-managed, Docker, Kubernetes (ECK). Fluentd runs on Web, Api.
Can I use Fluentd for free?
Yes. Fluentd has a free tier, so you can try it without paying. Elastic Stack starts at On request.
What is Elastic Stack best used for?
Elastic Stack is most often used for distributed search and analytics engine for production-scale workloads, full-text search and vector search with approximate nearest neighbour support, security event tracking with field-level and document-level access control, machine learning capabilities including anomaly detection and forecasting. Of those, distributed search and analytics engine for production-scale workloads and full-text search and vector search with approximate nearest neighbour support are not what Fluentd is typically brought in for.
What can Elastic Stack do that Fluentd cannot?
Elastic Stack covers Full-text search, Log analytics, Security monitoring, Alerting. Fluentd covers Log collection, Data parsing, Filtering and buffering, Event routing. Both handle API, Webhooks, REST, Web support.
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