Software · head to head
AppDynamics vs Fluent Bit
The short version
- Each has a real cost: AppDynamics appdynamics.com/pricing returns a 301 redirect to Splunk's observability pricing page; the product is now sold as Splunk AppDynamics; 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
- They diverge on capability: AppDynamics covers Application performance monitoring, Fluent Bit covers Log collection.
Where they differ
Only the attributes on which AppDynamics and Fluent Bit actually diverge.
| Attribute | AppDynamics | Fluent Bit |
|---|---|---|
| Pricing model | usage-based | open-source |
| Founded | 2008 | 2015 |
Identical on both: starting price (Free), free tier (Yes), platforms (Web, Api), user rating (Not yet rated), category (Unknown).
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 AppDynamics
- Application performance monitoring
- Distributed tracing
- Real-time analytics
- Alert management
Only in Fluent Bit
- Log collection
- Lightweight processing
- Data parsing
- Event filtering
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.
AppDynamics
- Application performance monitoring for Java, .NET and other enterprise application stacksnot Fluent Bit
- Business transaction tracing across distributed application tiersnot Fluent Bit
- Infrastructure monitoring priced per vCPUnot Fluent Bit
Fluent Bit
- Lightweight log and metric forwarding from containers and edge devicesnot AppDynamics
- Kubernetes node level log collection with a small memory footprintnot AppDynamics
- Filtering and enriching telemetry before shipping it to a backendnot AppDynamics
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
AppDynamics
- appdynamics.com/pricing returns a 301 redirect to Splunk's observability pricing page; the product is now sold as Splunk AppDynamics
- Infrastructure Edition starts at $6 per vCPU per month billed annually, so cost scales with core count rather than host count
- Premium Edition starts at $33 per host per month and Enterprise Edition at $50 per host per month, both billed annually
- The published figures are starting prices only, with volume pricing requiring a sales quote
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
Pricing, plan by plan
AppDynamics
Free- FreeFree
- Application performance monitoring
- Distributed tracing
- Real-time analytics
Fluent Bit
Free- FreeFree
- Log collection
- Lightweight processing
- Data parsing
Which should you pick?
Choose AppDynamics if
- You need application performance monitoring.
- You want to start without paying.
- You work on Web, Api.
- You also want distributed tracing.
Choose Fluent Bit if
- You need log collection.
- You want to start without paying.
- You work on Web, Api.
- You also want lightweight processing.
Questions people ask
- Is AppDynamics or Fluent Bit better?
- Neither clearly leads. AppDynamics starts at Free and Fluent Bit at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, AppDynamics or Fluent Bit?
- AppDynamics starts at Free and Fluent Bit at Free.
- Does AppDynamics or Fluent Bit run on more platforms?
- Both run on Web, Api, so platform support will not decide this one for you.
- Can I use AppDynamics for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is AppDynamics best used for?
- AppDynamics is most often used for application performance monitoring for java, .net and other enterprise application stacks, business transaction tracing across distributed application tiers, infrastructure monitoring priced per vcpu. Of those, application performance monitoring for java, .net and other enterprise application stacks and business transaction tracing across distributed application tiers are not what Fluent Bit is typically brought in for.
- What can AppDynamics do that Fluent Bit cannot?
- AppDynamics covers Application performance monitoring, Distributed tracing, Real-time analytics, Alert management. Fluent Bit covers Log collection, Lightweight processing, Data parsing, Event filtering. Both handle API, Webhooks, REST, Web support.