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Logging · head to head

Fluent Bit vs Retrace

Fluent Bit logo

Fluent Bit

Logging

Fast and Lightweight Log Processor

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: Fluent Bit fluent Bit ships over 100 built in plugins against more than 1,000 external plugins available for Fluentd, so fewer integrations exist out of the box; Retrace end of Life scheduled for March 31, 2027; the product is being discontinued
  • They diverge on capability: Fluent Bit 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 Fluent Bit and Retrace actually diverge.

Attributes where Fluent Bit and Retrace differ
AttributeFluent BitRetrace
Pricing modelopen-sourcesubscription
PlatformsWeb, ApiWeb, .NET, Java, PHP, Node.js, Python
Founded20152012

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 Fluent Bit

  • Log collection
  • Lightweight processing
  • Data parsing
  • Event filtering

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.

Fluent Bit

  • Lightweight log and metric forwarding from containers and edge devicesnot Retrace
  • Kubernetes node level log collection with a small memory footprintnot Retrace
  • Filtering and enriching telemetry before shipping it to a backendnot Retrace

Retrace

  • Log monitoringnot Fluent Bit
  • Application performancenot Fluent Bit
  • Security analyticsnot Fluent Bit
  • Troubleshootingnot Fluent Bit

Where each one falls short

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

Fluent Bit

  • Fluent Bit ships over 100 built in plugins against more than 1,000 external plugins available for Fluentd, so fewer integrations exist out of the box
  • It is written in C, so extending it beyond the built in plugins means writing C rather than Ruby
  • Dependencies are zero only until a plugin requires one

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

Fluent Bit

Free
  • FreeFree
    • Log collection
    • Lightweight processing
    • Data parsing

Retrace

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

Which should you pick?

Choose Fluent Bit if

  • You need log collection.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want lightweight processing.
Fluent Bit 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 Fluent Bit or Retrace better?
Neither clearly leads. Fluent Bit 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, Fluent Bit or Retrace?
Fluent Bit starts at Free and Retrace at Free.
Does Fluent Bit or Retrace run on more platforms?
Fluent Bit runs on Web, Api. Retrace runs on Web, .NET, Java, PHP, Node.js, Python.
Can I use Fluent Bit for free?
Both have a free tier, so you can try either at no cost before committing.
What is Fluent Bit best used for?
Fluent Bit is most often used for lightweight log and metric forwarding from containers and edge devices, kubernetes node level log collection with a small memory footprint, filtering and enriching telemetry before shipping it to a backend. Of those, lightweight log and metric forwarding from containers and edge devices and kubernetes node level log collection with a small memory footprint are not what Retrace is typically brought in for.
What can Fluent Bit do that Retrace cannot?
Fluent Bit covers Log collection, Lightweight processing, Data parsing, Event filtering. Retrace covers Log management, Application performance tracking, Error detection, Code profiling. Both handle API, Webhooks, REST, Web support.

Answered from the vendors’ own pages

Fluent Bit: Is Fluent Bit free?

Yes, Fluent Bit is a CNCF graduated open-source project with no vendor lock-in and is freely available for download and use.

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
Fluent Bit: Does Fluent Bit offer an Enterprise option?

The website navigation mentions an Enterprise section suggesting paid offerings exist, but specific pricing and details are not provided on the publicly available pages.

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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