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Fluentd vs Retrace

Fluentd logo

Fluentd

Logging

Open Source Data Collector for Unified Logging

From
Free
Rated
-
Full reviewWebsite
Retrace logo

Retrace

Logging

Application Performance Monitoring and Logs

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Fluentd fluentd needs more than 60 MB of memory at runtime, against roughly 450 KB for Fluent Bit; Retrace end of Life scheduled for March 31, 2027; the product is being discontinued
  • They diverge on capability: Fluentd covers Log collection, Retrace covers Log management.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Fluentd and Retrace actually diverge.

Attributes where Fluentd and Retrace differ
AttributeFluentdRetrace
Pricing modelopen-sourcesubscription
PlatformsWeb, ApiWeb, .NET, Java, PHP, Node.js, Python
Founded20112012

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

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 Fluentd

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

Only in Retrace

  • Log management
  • Application performance tracking
  • Error detection
  • Code profiling
  • Performance baselines

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.

Fluentd

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

Retrace

  • Log monitoringnot Fluentd
  • Application performancenot Fluentd
  • Security analyticsnot Fluentd
  • Troubleshootingnot Fluentd

Where each one falls short

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

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

Retrace

  • End of Life scheduled for March 31, 2027; the product is being discontinued
  • Costs escalate quickly with per-server billing model, expensive at scale
  • User interface and dashboard criticisms; UI is outdated and difficult to use
  • Logging latency; logs can take time to appear and are not instant
  • Less mature support for Node.js, Python, and newer ecosystems
  • Reporting issues where process restarts provide only timeline without root cause data
  • Reliability concerns; monitoring has stopped collecting traces with no warning

Pricing, plan by plan

Fluentd

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

Retrace

Free
  • FreeFree
    • Log management
    • Application performance tracking
    • Error detection

Which should you pick?

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

Choose Retrace if

  • You need log management.
  • You want to start without paying.
  • You work on Web, .NET, Java, PHP, Node.js, Python.
  • You also want application performance tracking.
Retrace review

Questions people ask

Is Fluentd or Retrace better?
Neither clearly leads. Fluentd starts at Free and Retrace at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fluentd or Retrace?
Fluentd starts at Free and Retrace at Free.
Does Fluentd or Retrace run on more platforms?
Fluentd runs on Web, Api. Retrace runs on Web, .NET, Java, PHP, Node.js, Python.
Can I use Fluentd for free?
Both have a free tier, so you can try either at no cost before committing.
What is Fluentd best used for?
Fluentd is most often used for unified log collection and routing from many sources to many destinations, parsing and transforming log records before forwarding, aggregating logs from containers into elasticsearch, s3 or a siem. Of those, unified log collection and routing from many sources to many destinations and parsing and transforming log records before forwarding are not what Retrace is typically brought in for.
What can Fluentd do that Retrace cannot?
Fluentd covers Log collection, Data parsing, Filtering and buffering, Event routing. Retrace covers Log management, Application performance tracking, Error detection, Code profiling. Both handle API, Webhooks, REST, Web support.

Answered from the vendors’ own pages

Fluentd: How much does Fluentd cost?

Fluentd is free and open-source under the Apache 2 License from the Cloud Native Computing Foundation (CNCF). There are no subscription fees, licensing costs, or commercial pricing tiers.

Source
Retrace: What does Retrace monitor?

Retrace provides application performance monitoring (APM), centralized log management, error tracking, code profiling, and real user monitoring (RUM). It aggregates logs from applications and servers in one place.

Source
Retrace: What programming languages does Retrace support?

Retrace supports .NET, .NET Core, PHP, Node.js, Ruby, Python, and Java applications. Support for Node.js, Python, and newer ecosystems is noted as less mature.

Source
Retrace: Is Retrace being discontinued?

Yes. Retrace will reach End of Life on March 31, 2027. Users should plan to migrate to alternative solutions.

Source
Retrace: What databases and services does Retrace integrate with?

Retrace supports SQL Server, Oracle, PostgreSQL, MySQL, Redis, MongoDB, Elasticsearch, and cloud platforms like AWS and Azure.

Source
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