Softwr

Cloud · head to head

Cilium vs ProtonVPN

Cilium logo

Cilium

Cloud

eBPF-based networking, observability and security for Kubernetes

From
Free
Rated
-
Full reviewWebsite
ProtonVPN logo

ProtonVPN

Cybersecurity

High-speed Swiss VPN that safeguards your privacy

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; ProtonVPN free plan limited to one device at a time
  • They diverge on capability: Cilium covers eBPF datapath, ProtonVPN covers No-logs policy.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Cilium and ProtonVPN actually diverge.

Attributes where Cilium and ProtonVPN differ
AttributeCiliumProtonVPN
Pricing modelOpen source, no licence feefreemium
PlatformsKubernetes, LinuxWindows, macOS, Linux, iOS, Android
CategoryCloudCybersecurity
FoundedUnknown2014

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

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 ProtonVPN

  • No-logs policy
  • Secure Core
  • Kill Switch
  • DNS leak protection
  • Tor over VPN
  • Split tunneling
  • NetShield ad-blocker
  • VPN Accelerator

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 ProtonVPN
  • Network policy expressed on workload identity rather than fragile IP rulesnot ProtonVPN
  • Seeing which services actually talk to each other, and what policy is droppingnot ProtonVPN

ProtonVPN

  • Privacy-focused browsing without subscription costnot Cilium
  • Multi-device protection with Plus plan supporting 10 devicesnot Cilium
  • Integrated access to Proton email and cloud services via Unlimited plannot 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

ProtonVPN

  • Free plan limited to one device at a time
  • Free plan restricted to 10 countries with random selection
  • Pricing amounts not clearly published; shown as variable

Pricing, plan by plan

Cilium

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

ProtonVPN

Free

No published plan breakdown. See the ProtonVPN review.

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 ProtonVPN if

  • You need no-logs policy.
  • You want to start without paying.
  • You work on Windows, macOS, Linux, iOS, Android.
  • You also want secure core.
ProtonVPN review

Questions people ask

Is Cilium or ProtonVPN better?
Neither clearly leads. Cilium starts at Free and ProtonVPN at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cilium or ProtonVPN?
Cilium starts at Free and ProtonVPN at Free.
Does Cilium or ProtonVPN run on more platforms?
Cilium runs on Kubernetes, Linux. ProtonVPN runs on Windows, macOS, Linux, iOS, Android.
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 ProtonVPN is typically brought in for.
What can Cilium do that ProtonVPN cannot?
Cilium covers eBPF datapath, Identity-based policy, Hubble observability, Sidecar-free mesh. ProtonVPN covers No-logs policy, Secure Core, Kill Switch, DNS leak protection.

Answered from the vendors’ own pages

Cilium: Is Cilium free?

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

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.

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.

Share

Related pages

More on Cilium

More on ProtonVPN

Keep looking

Other head to heads