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Cloud · head to head

Cilium vs Doppler

Cilium logo

Cilium

Cloud

eBPF-based networking, observability and security for Kubernetes

From
Free
Rated
-
Full reviewWebsite
Doppler logo

Doppler

Cybersecurity

Secrets management for humans and AI agents

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; Doppler developer tier limited to 3 free users with per-user fees beyond that
  • They diverge on capability: Cilium covers eBPF datapath, Doppler covers Secrets management.
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Cilium and Doppler actually diverge.

Attributes where Cilium and Doppler differ
AttributeCiliumDoppler
Pricing modelOpen source, no licence feeUnknown
PlatformsKubernetes, LinuxWeb, CLI, Cloud, On-Premises
CategoryCloudCybersecurity

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 Doppler

  • Secrets management
  • Automated credential rotation
  • Dynamic secrets
  • Audit logging
  • SAML SSO
  • Role-based access control
  • Config syncing
  • AI agent support

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

Doppler

  • Managing API keys for distributed development teamsnot Cilium
  • Securing credentials for AI agents without per-agent feesnot Cilium
  • Automating credential rotation for compliancenot Cilium
  • Centralizing secrets across cloud and on-premise infrastructurenot 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

Doppler

  • Developer tier limited to 3 free users with per-user fees beyond that
  • Team plan pricing ($21/user/mo) adds cost for large teams
  • 90-day activity log retention may be insufficient for long-term audits
  • Enterprise plan requires custom pricing conversation

Pricing, plan by plan

Cilium

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

Doppler

Free
  • DeveloperFree
    • 3 free users
    • Then $8 per additional user per month
    • Doppler CLI access
  • Team$21/month
    • Per-user pricing
    • Change requests
    • SAML SSO
  • Enterprise$undefined/custom
    • Custom pricing scaled to team size
    • On-prem or cloud deployment
    • Custom permissions

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 Doppler if

  • You need secrets management.
  • You want to start without paying.
  • You work on Web, CLI, Cloud, On-Premises.
  • You also want automated credential rotation.
Doppler review

Questions people ask

Is Cilium or Doppler better?
Neither clearly leads. Cilium starts at Free and Doppler at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cilium or Doppler?
Cilium starts at Free and Doppler at Free.
Does Cilium or Doppler run on more platforms?
Cilium runs on Kubernetes, Linux. Doppler runs on Web, CLI, Cloud, On-Premises.
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 Doppler is typically brought in for.
What can Cilium do that Doppler cannot?
Cilium covers eBPF datapath, Identity-based policy, Hubble observability, Sidecar-free mesh. Doppler covers Secrets management, Automated credential rotation, Dynamic secrets, Audit logging.

Answered from the vendors’ own pages

Cilium: Is Cilium free?

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

Doppler: Do AI agents count toward my user limit?

No, AI agents and non-human identities receive free access across all Doppler plans, including Developer, Team, and Enterprise.

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.

Doppler: What is the difference between Team and Enterprise plans?

Team plan ($21/user/mo) includes SAML SSO, role-based access controls, and 90-day logs. Enterprise adds custom deployment options, unlimited config syncs, 99.95% SLA, and a dedicated account manager.

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.

Doppler: Can I rotate secrets automatically?

Yes, both Team and Enterprise plans support automatic secret rotation. Developer tier supports manual rotation only.

Source
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