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Logging · head to head

Fluentd vs Logz.io

Fluentd logo

Fluentd

Logging

Open Source Data Collector for Unified Logging

From
Free
Rated
-
Full reviewWebsite
Logz.io logo

Logz.io

Logging

AI-Powered Log Analytics and Monitoring Platform

From
$99/month
Rated
-
Full reviewWebsite

The short version

  • Only Fluentd has a free tier, so it costs nothing to try first.
  • Each has a real cost: Fluentd fluentd needs more than 60 MB of memory at runtime, against roughly 450 KB for Fluent Bit; Logz.io saaS-only with no self-hosting option
  • They diverge on capability: Fluentd covers Log collection, Logz.io covers Log aggregation.
  • Prices and features above were last checked on 2 September 2026.

Where they differ

Only the attributes on which Fluentd and Logz.io actually diverge.

Attributes where Fluentd and Logz.io differ
AttributeFluentdLogz.io
Starting priceFree$99/month
Pricing modelopen-sourceUnknown
Free tierYesNo
PlatformsWeb, ApiCloud (SaaS), Web
Founded20112014

Identical on both: 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 Logz.io

  • Log aggregation
  • AI-powered insights
  • Elasticsearch integration
  • Alert management
  • Security 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.

Fluentd

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

Logz.io

  • 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

Logz.io

  • SaaS-only with no self-hosting option
  • High pricing for long data retention periods, with steep cost increases for larger data volumes
  • UI can take up to 10 seconds to load
  • Geo-location data is old and inaccurate
  • Expensive for smaller companies with limited log volumes
  • Data retention limitations at 14 days may not meet compliance requirements

Pricing, plan by plan

Fluentd

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

Logz.io

$99/month
  • Pro$99/month
    • Log management
    • Real-time search
    • Basic alerts
  • Enterprise$undefined/mo
    • All Pro features
    • Advanced security
    • Dedicated support

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 Logz.io if

  • You need log aggregation.
  • You work on Cloud (SaaS), Web.
  • You also want ai-powered insights.
Logz.io review

Questions people ask

Is Fluentd or Logz.io better?
Neither clearly leads. Fluentd starts at Free and Logz.io at $99/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fluentd or Logz.io?
Fluentd has a free tier; the other does not. Paid plans start at Free for Fluentd and $99/month for Logz.io.
Does Fluentd or Logz.io run on more platforms?
Fluentd runs on Web, Api. Logz.io runs on Cloud (SaaS), Web.
Can I use Fluentd for free?
Yes. Fluentd has a free tier, so you can try it without paying. Logz.io starts at $99/month.
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 Logz.io is typically brought in for.
What can Fluentd do that Logz.io cannot?
Fluentd covers Log collection, Data parsing, Filtering and buffering, Event routing. Logz.io covers Log aggregation, AI-powered insights, Elasticsearch integration, Alert management. 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
Logz.io: Does Logz.io support self-hosting?

No. Logz.io is a fully SaaS platform with no self-hosting option, limiting flexibility for organizations with on-premises requirements or specific data residency needs.

Source
Logz.io: Is Logz.io based on open-source ELK Stack?

Logz.io is built on the ELK Stack (Elasticsearch, Logstash, Kibana) but uses managed hosting. Note that Elasticsearch and Kibana switched to non-open-source licenses (SSPL) in February 2021, which may have legal implications.

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