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Logging · head to head

Fluent Bit vs Raygun

Fluent Bit logo

Fluent Bit

Logging

Fast and Lightweight Log Processor

From
Free
Rated
-
Full reviewWebsite
Raygun logo

Raygun

Logging

Real User Monitoring and Crash Reporting

From
$40/month
Rated
-
Full reviewWebsite

The short version

  • Only Fluent Bit has a free tier, so it costs nothing to try first.
  • 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; Raygun crash Reporting error data is retained for 180 days and Real User Monitoring sessions for only 60 days; longer retention is Enterprise only
  • They diverge on capability: Fluent Bit covers Log collection, Raygun covers Crash reporting.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

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

Attributes where Fluent Bit and Raygun differ
AttributeFluent BitRaygun
Starting priceFree$40/month
Pricing modelopen-sourceusage-based
Free tierYesNo
Founded20152011

Identical on both: 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 Raygun

  • Crash reporting
  • Real user monitoring
  • Performance tracking
  • Source maps

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

Raygun

  • Crash and error reporting for web, mobile and backend applicationsnot Fluent Bit
  • Real user monitoring of front end page load and session performancenot Fluent Bit
  • Application performance monitoring with request level tracesnot 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

Raygun

  • Crash Reporting error data is retained for 180 days and Real User Monitoring sessions for only 60 days; longer retention is Enterprise only
  • Crash Reporting, Real User Monitoring and APM are billed as three separate products, each metered on its own unit of errors, sessions or traces
  • A Real User Monitoring session ends after 30 minutes of inactivity, so a single visit spanning breaks is billed as several sessions
  • Usage beyond the plan allowance is billed on demand at $0.001 per error and $0.002 per session or trace
  • Enterprise plan pricing is custom with no published rate

Pricing, plan by plan

Fluent Bit

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

Raygun

$40/month
  • Basic$40/month
    • Core monitoring, unlimited apps and members
    • Basic alerts, deployment tracking
    • Annual billing saves 33%
  • Team$80/month
    • Inbound filters and third-party integrations
    • Unlimited dashboards and user roles
    • Marked as MOST POPULAR plan
  • Business$400/month
    • SAML SSO and dedicated account manager
    • Priority support and quarterly reviews
    • Annual billing saves 33%
  • Enterprise$undefined/mo
    • Custom pricing and compliance requirements
    • Unlimited reports and SLA agreements
    • Private Slack support

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 Raygun if

  • You need crash reporting.
  • You work on Web, Api.
  • You also want real user monitoring.
Raygun review

Questions people ask

Is Fluent Bit or Raygun better?
Neither clearly leads. Fluent Bit starts at Free and Raygun at $40/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fluent Bit or Raygun?
Fluent Bit has a free tier; the other does not. Paid plans start at Free for Fluent Bit and $40/month for Raygun.
Does Fluent Bit or Raygun 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?
Yes. Fluent Bit has a free tier, so you can try it without paying. Raygun starts at $40/month.
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 Raygun is typically brought in for.
What can Fluent Bit do that Raygun cannot?
Fluent Bit covers Log collection, Lightweight processing, Data parsing, Event filtering. Raygun covers Crash reporting, Real user monitoring, Performance tracking, Source maps. 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
Raygun: Does Raygun offer a free trial?

Yes. Raygun offers a free 14-day trial with no credit card required. The trial includes feature access across all products.

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
Raygun: What is Raygun's pricing model?

Raygun uses a usage-based pricing model with tiered plans starting at $40/month for Basic tier, plus per-event charges ($0.001 to $0.002 per event). Annual billing saves 33% compared to monthly rates.

Source
Raygun: What features are included in the Team plan?

Team plan at $80/month includes inbound filters, third-party integrations, unlimited dashboards, user roles, and is marked as the most popular option. It's positioned between Basic and Business tiers.

Source
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