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Cloud · head to head

Cilium vs Serverless Framework

Cilium logo

Cilium

Cloud

eBPF-based networking, observability and security for Kubernetes

From
Free
Rated
-
Full reviewWebsite
Serverless Framework logo

Serverless Framework

Cloud

Build and deploy serverless applications on AWS Lambda

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Cilium requires a recent Linux kernel, which rules out older distributions and some managed environments; Serverless Framework exclusive to AWS Lambda - no support for other cloud providers
  • They diverge on capability: Cilium covers eBPF datapath, Serverless Framework covers YAML configuration.

Where they differ

Only the attributes on which Cilium and Serverless Framework actually diverge.

Attributes where Cilium and Serverless Framework differ
AttributeCiliumServerless Framework
Pricing modelOpen source, no licence feeUnknown
PlatformsKubernetes, LinuxAWS Lambda, AWS API Gateway, AWS CloudFormation

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Cloud).

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 Cilium

  • eBPF datapath
  • Identity-based policy
  • Hubble observability
  • Sidecar-free mesh

Only in Serverless Framework

  • YAML configuration
  • Single command deployment
  • Extensible plugin ecosystem
  • Multi-language support
  • Unified dashboard
  • Built-in metrics and alerts

What people use each for

The jobs each tool is most often brought in to do.

Cilium

  • Kubernetes networking at a scale where iptables-based CNI performance degradesnot Serverless Framework
  • Network policy expressed on workload identity rather than fragile IP rulesnot Serverless Framework
  • Seeing which services actually talk to each other, and what policy is droppingnot Serverless Framework

Serverless Framework

  • Deploying APIs and microservices to AWS Lambdanot Cilium
  • Building event-driven applications with serverless functionsnot Cilium
  • Managing multi-language serverless projectsnot Cilium

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Cilium

  • Requires a recent Linux kernel, which rules out older distributions and some managed environments
  • eBPF is genuinely hard to debug when it misbehaves, and the skill is rare on most teams
  • Broad scope — CNI, policy, mesh, observability — means the learning curve covers several domains at once

Serverless Framework

  • Exclusive to AWS Lambda - no support for other cloud providers
  • Paid tier requires credit system that can be confusing for budgeting
  • Plugin ecosystem quality varies significantly

Pricing, plan by plan

Cilium

Free
  • CiliumFree
    • Full functionality
    • No usage limits
    • Community support

Serverless Framework

Free
  • FreeFree
    • For organizations with under $2M annual revenue
    • All Framework features included
  • Pay-As-You-Go$4/credit
    • 1 credit = 1 Service Instance or 50K Traces or 4M Metrics
    • Standard rate for larger organizations
  • Reserved Credits$1/credit
    • Discounts up to 74% off (1-year), 77% off (2-year), 80% off (3-year)
    • Additional 10% off for upfront payment

Which should you pick?

Choose Cilium if

  • You need ebpf datapath.
  • You want to start without paying.
  • You work on Kubernetes, Linux.
  • You also want identity-based policy.
Cilium review

Choose Serverless Framework if

  • You need yaml configuration.
  • You want to start without paying.
  • You work on AWS Lambda, AWS API Gateway, AWS CloudFormation.
  • You also want single command deployment.
Serverless Framework review

Questions people ask

Is Cilium or Serverless Framework better?
Neither clearly leads. Cilium starts at Free and Serverless Framework at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cilium or Serverless Framework?
Cilium starts at Free and Serverless Framework at Free.
Does Cilium or Serverless Framework run on more platforms?
Cilium runs on Kubernetes, Linux. Serverless Framework runs on AWS Lambda, AWS API Gateway, AWS CloudFormation.
Can I use Cilium for free?
Both have a free tier, so you can try either at no cost before committing.
What is Cilium best used for?
Cilium is most often used for kubernetes networking at a scale where iptables-based cni performance degrades, network policy expressed on workload identity rather than fragile ip rules, seeing which services actually talk to each other, and what policy is dropping. Of those, kubernetes networking at a scale where iptables-based cni performance degrades and network policy expressed on workload identity rather than fragile ip rules are not what Serverless Framework is typically brought in for.
What can Cilium do that Serverless Framework cannot?
Cilium covers eBPF datapath, Identity-based policy, Hubble observability, Sidecar-free mesh. Serverless Framework covers YAML configuration, Single command deployment, Extensible plugin ecosystem, Multi-language support.

Answered from the vendors’ own pages

Cilium: Is Cilium free?

Yes, open source and CNCF-graduated. Isovalent sells an enterprise distribution and support.

Serverless Framework: When do I have to pay for Serverless Framework?

The Serverless Framework CLI v4+ is free for organizations earning under $2 million annually. Organizations earning more must purchase credits at $4 per credit standard rate or reserved credits starting at $1 per credit with volume discounts.

Source
Cilium: What does eBPF change?

It lets Cilium run packet-processing programs inside the kernel instead of relying on iptables rule chains, which behave poorly as the number of services grows.

Serverless Framework: What cloud providers does Serverless Framework support?

Serverless Framework is exclusive to AWS Lambda. It does not support other cloud providers like Azure or Google Cloud.

Source
Cilium: Does Cilium replace a service mesh?

It can cover much of what a mesh does without sidecars, though full mesh feature sets still favour Istio or Linkerd.

Serverless Framework: What does one credit cover?

One credit equals 1 Service Instance, 50,000 Traces, or 4 Million Metrics.

Source
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