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Logging · head to head

Fluent Bit vs Graylog

Fluent Bit logo

Fluent Bit

Logging

Fast and Lightweight Log Processor

From
Free
Rated
-
Full reviewWebsite
Graylog logo

Graylog

Logging

Log Aggregation and Analysis Platform

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; Graylog graylog Enterprise starts at $15,000 per year and Graylog Security at $18,000 per year, priced by daily volume or annual consumption
  • They diverge on capability: Fluent Bit covers Log collection, Graylog covers Log aggregation.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Fluent Bit and Graylog actually diverge.

Attributes where Fluent Bit and Graylog differ
AttributeFluent BitGraylog
Founded20152011

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

  • Log aggregation
  • Full-text search
  • Parsing and extraction
  • Real-time analytics

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 Graylog
  • Kubernetes node level log collection with a small memory footprintnot Graylog
  • Filtering and enriching telemetry before shipping it to a backendnot Graylog

Graylog

  • Log aggregation and analysis for SecOps teamsnot Fluent Bit
  • IT and DevOps monitoring and troubleshootingnot Fluent Bit
  • Enterprise security event monitoringnot 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

Graylog

  • Graylog Enterprise starts at $15,000 per year and Graylog Security at $18,000 per year, priced by daily volume or annual consumption
  • Correlation engine, scheduled and custom reports, compliance reports and teams management are Enterprise-only
  • Data tiering across hot, warm and archive storage is an Enterprise feature, not available in Graylog Open
  • Graylog Open carries community support only; professional support requires a paid edition
  • UEBA anomaly detection, Sigma rules, MITRE ATT&CK alignment and SOAR automation are limited to Graylog Security

Pricing, plan by plan

Fluent Bit

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

Graylog

Free
  • FreeFree
    • Log aggregation
    • Full-text search
    • Parsing and extraction

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 Graylog if

  • You need log aggregation.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want full-text search.
Graylog review

Questions people ask

Is Fluent Bit or Graylog better?
Neither clearly leads. Fluent Bit starts at Free and Graylog at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fluent Bit or Graylog?
Fluent Bit starts at Free and Graylog at Free.
Does Fluent Bit or Graylog run on more platforms?
Both run on Web, Api, so platform support will not decide this one for you.
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 Graylog is typically brought in for.
What can Fluent Bit do that Graylog cannot?
Fluent Bit covers Log collection, Lightweight processing, Data parsing, Event filtering. Graylog covers Log aggregation, Full-text search, Parsing and extraction, Real-time analytics. 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
Graylog: Does Graylog have a free version?

Yes. Graylog Open is a free, open-source option for collecting, storing, searching, and analyzing log data. However, it includes only community support.

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
Graylog: How much does Graylog Enterprise cost?

Graylog Enterprise pricing starts at $15,000/year based on daily log volume or annual data consumption. Exact pricing requires contacting sales.

Source
Graylog: What is the difference between Graylog Enterprise and Security editions?

Graylog Security starts at $18,000/year and includes advanced threat detection capabilities beyond the Enterprise edition. Both include technical support.

Source
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