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Logging · head to head

Fluent Bit vs Rootly

Fluent Bit logo

Fluent Bit

Logging

Fast and Lightweight Log Processor

From
Free
Rated
-
Full reviewWebsite
Rootly logo

Rootly

Logging

AI-native incident management with automation, on-call, and root cause analysis

From
$20/user-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; Rootly pricing higher than some competitors for basic features
  • They diverge on capability: Fluent Bit covers Log collection, Rootly covers AI SRE automation.

Where they differ

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

Attributes where Fluent Bit and Rootly differ
AttributeFluent BitRootly
Starting priceFree$20/user-month
Pricing modelopen-sourcesubscription
Free tierYesNo
PlatformsWeb, ApiWeb, Mobile, Slack, Microsoft Teams
Founded20152020

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 Fluent Bit

  • Log collection
  • Lightweight processing
  • Data parsing
  • Event filtering
  • API
  • Webhooks
  • REST
  • Web support

Only in Rootly

  • AI SRE automation
  • Alert routing
  • On-call management
  • Incident response
  • Call routing
  • AI meeting bot
  • Status pages

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

Rootly

  • Automate on-call and incident response workflowsnot Fluent Bit
  • Run root cause analysis with AI assistancenot Fluent Bit
  • Track and improve Mean Time to Mitigation (MTTR)not Fluent Bit
  • Coordinate response across distributed teamsnot Fluent Bit
  • Learn from post-incident retrospectivesnot 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

Rootly

  • Pricing higher than some competitors for basic features
  • AI SRE features require separate contact-sales engagement
  • Learning curve for advanced automation features
  • Per-user pricing increases costs as team grows

Pricing, plan by plan

Fluent Bit

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

Rootly

$20/user-month
  • Incident Response Essentials$20/user-month
    • Response with Slack integration
    • @Rootly AI Chat
    • AI Similar Incidents detection
  • Incident Response Enterprise$undefined/custom
    • All Essentials features
    • Custom forms and incident types
    • Private incidents
  • On-Call Essentials$20/user-month
    • Alert grouping and routing
    • Live call routing (1 phone number)
    • Schedules and escalation policies
  • On-Call Enterprise$undefined/custom
    • All Essentials features
    • 5 phone numbers for call routing
    • Unlimited schedules

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 Rootly if

  • You need ai sre automation.
  • You work on Web, Mobile, Slack, Microsoft Teams.
  • You also want alert routing.
Rootly review

Questions people ask

Is Fluent Bit or Rootly better?
Neither clearly leads. Fluent Bit starts at Free and Rootly at $20/user-month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fluent Bit or Rootly?
Fluent Bit has a free tier; the other does not. Paid plans start at Free for Fluent Bit and $20/user-month for Rootly.
Does Fluent Bit or Rootly run on more platforms?
Fluent Bit runs on Web, Api. Rootly runs on Web, Mobile, Slack, Microsoft Teams.
Can I use Fluent Bit for free?
Yes. Fluent Bit has a free tier, so you can try it without paying. Rootly starts at $20/user-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 Rootly is typically brought in for.
What can Fluent Bit do that Rootly cannot?
Fluent Bit covers Log collection, Lightweight processing, Data parsing, Event filtering. Rootly covers AI SRE automation, Alert routing, On-call management, Incident response.

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
Rootly: How much does Rootly cost?

Rootly charges $20/user/month for both Incident Response and On-Call Essentials plans. Enterprise plans require contacting sales. Startups under 100 employees with less than $50M raised get up to 50% discount.

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
Rootly: What is Rootly AI SRE?

AI SRE is an advanced feature that provides automated root cause analysis, alert correlation with system changes, impact analysis, and remediation suggestions. Pricing requires contact with sales.

Source
Rootly: Does Rootly integrate with Slack?

Yes, Rootly natively integrates with Slack for incident response workflows, allowing teams to manage incidents directly in Slack.

Source
Rootly: Are there discounts for small companies?

Yes, startups under 100 employees or less than 25 employees can get special pricing up to 50% discount. Contact Rootly sales for details.

Source
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