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Logging · head to head

Fluentd vs Stackdriver

Fluentd logo

Fluentd

Logging

Open Source Data Collector for Unified Logging

From
Free
Rated
-
Full reviewWebsite
Stackdriver logo

Stackdriver

Logging

Google Cloud Operations - Monitoring and Logging

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; Stackdriver stackdriver is now branded Google Cloud Observability and cloud.google.com/stackdriver redirects to the Observability product page
  • They diverge on capability: Fluentd covers Log collection, Stackdriver covers Log management.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Fluentd and Stackdriver actually diverge.

Attributes where Fluentd and Stackdriver differ
AttributeFluentdStackdriver
Pricing modelopen-sourceusage-based
Founded20112006

Identical on both: starting price (Free), 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 Fluentd

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

Only in Stackdriver

  • Log management
  • Metrics collection
  • Real-time monitoring
  • Error reporting

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 Stackdriver
  • Parsing and transforming log records before forwardingnot Stackdriver
  • Aggregating logs from containers into Elasticsearch, S3 or a SIEMnot Stackdriver

Stackdriver

  • Application performance monitoringnot Fluentd
  • Log aggregation and analysisnot Fluentd
  • Cloud infrastructure observabilitynot Fluentd
  • Distributed trace analysisnot 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

Stackdriver

  • Stackdriver is now branded Google Cloud Observability and cloud.google.com/stackdriver redirects to the Observability product page
  • Cloud Logging charges $0.50 per GiB ingested, with only the first 50 GiB per project per month free
  • Logs kept beyond 30 days cost an extra $0.01 per GiB per month on top of the ingestion charge
  • Monitoring metric ingestion starts at $0.2580 per MiB, with only the first 150 MiB per billing account free
  • Alerting policies are billed at $0.35 per month for each metric reference in the policy
  • Uptime checks cost $0.30 per 1,000 executions and synthetic monitors $1.20 per 1,000 executions, with only 100 synthetic executions per billing account free
  • Monitoring read API calls cost $0.50 per million time series returned beyond the first million per billing account
  • Log volume is measured before indexing on the actual size of log entries, so verbose logging directly drives cost

Pricing, plan by plan

Fluentd

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

Stackdriver

Free
  • FreeFree
    • Log management
    • Metrics collection
    • Real-time monitoring

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 Stackdriver if

  • You need log management.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want metrics collection.
Stackdriver review

Questions people ask

Is Fluentd or Stackdriver better?
Neither clearly leads. Fluentd starts at Free and Stackdriver at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fluentd or Stackdriver?
Fluentd starts at Free and Stackdriver at Free.
Does Fluentd or Stackdriver run on more platforms?
Both run on Web, Api, so platform support will not decide this one for you.
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 Stackdriver is typically brought in for.
What can Fluentd do that Stackdriver cannot?
Fluentd covers Log collection, Data parsing, Filtering and buffering, Event routing. Stackdriver covers Log management, Metrics collection, Real-time monitoring, Error reporting. 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
Stackdriver: How much does Google Cloud Observability (Stackdriver) cost?

Google Cloud Observability does not publish fixed subscription prices. The service uses a usage-based pricing model where you pay for actual consumption. Specific rates require visiting the individual pricing pages for Cloud Logging, Cloud Monitoring, Cloud Trace, and Cloud Profiler.

Source
Stackdriver: What is the pricing model for Cloud Logging?

Cloud Logging uses usage-based pricing charged per GB of logs ingested and per GB stored, with monthly free tiers included. Storage charges vary by retention period and location.

Source
Stackdriver: How is Cloud Monitoring billed?

Cloud Monitoring charges per custom metric time series per month, with a monthly free tier for metrics. Standard monitoring includes basic default metrics at no extra charge.

Source
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