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Elastic APM vs Fluentd

Elastic APM logo

Elastic APM

Software

Application Performance Monitoring from Elastic

From
Free
Rated
-
Full reviewWebsite
Fluentd logo

Fluentd

Software

Open Source Data Collector for Unified Logging

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Elastic APM pricing is not published on the product page; cost follows the underlying Elastic deployment rather than being quoted per host or per service; Fluentd fluentd needs more than 60 MB of memory at runtime, against roughly 450 KB for Fluent Bit
  • They diverge on capability: Elastic APM covers Performance monitoring, Fluentd covers Log collection.

Where they differ

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

Attributes where Elastic APM and Fluentd differ
AttributeElastic APMFluentd

Identical on both: starting price (Free), pricing model (open-source), free tier (Yes), platforms (Web, Api), 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 APM

  • Performance monitoring
  • Error tracking
  • Transaction tracing
  • Custom metrics

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 APM

  • Distributed tracing across microservicesnot Fluentd
  • Auto-instrumenting Java, .NET, Python, Go, Node.js, Ruby, PHP and C++ servicesnot Fluentd
  • OpenTelemetry-native collection through the Elastic distributionsnot Fluentd
  • Correlating latency and errors with machine learningnot Fluentd
  • Monitoring LLM calls alongside application tracesnot Fluentd

Fluentd

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

Where each one falls short

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

Elastic APM

  • Pricing is not published on the product page; cost follows the underlying Elastic deployment rather than being quoted per host or per service
  • Self-managed deployment means running and scaling Elasticsearch yourself
  • Serverless does not carry every capability the hosted option does

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 APM

Free
  • FreeFree
    • Performance monitoring
    • Error tracking
    • Transaction tracing

Fluentd

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

Which should you pick?

Choose Elastic APM if

  • You need performance monitoring.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want error tracking.
Elastic APM 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 APM or Fluentd better?
Neither clearly leads. Elastic APM starts at Free and Fluentd at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Elastic APM or Fluentd?
Elastic APM starts at Free and Fluentd at Free.
Does Elastic APM or Fluentd run on more platforms?
Both run on Web, Api, so platform support will not decide this one for you.
Can I use Elastic APM for free?
Both have a free tier, so you can try either at no cost before committing.
What is Elastic APM best used for?
Elastic APM is most often used for distributed tracing across microservices, auto-instrumenting java, .net, python, go, node.js, ruby, php and c++ services, opentelemetry-native collection through the elastic distributions, correlating latency and errors with machine learning. Of those, distributed tracing across microservices and auto-instrumenting java, .net, python, go, node.js, ruby, php and c++ services are not what Fluentd is typically brought in for.
What can Elastic APM do that Fluentd cannot?
Elastic APM covers Performance monitoring, Error tracking, Transaction tracing, Custom metrics. Fluentd covers Log collection, Data parsing, Filtering and buffering, Event routing. Both handle API, Webhooks, REST, Web support.
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