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Cybersecurity · head to head

Cosign vs Private Internet Access

Cosign logo

Cosign

Cybersecurity

Signs and verifies container images and artifacts, with or without managing keys

From
Free
Rated
-
Full reviewWebsite
P

Private Internet Access

Cybersecurity

Long-standing VPN service with a large server network and flexible multi-year plans

From
$11.99/month
Rated
-
Full reviewWebsite

The short version

  • Only Cosign has a free tier, so it costs nothing to try first.
  • Each has a real cost: Cosign keyless signing inherits every weakness of the identity provider behind it. Sigstore’s own threat model states that if an identity provider is compromised, Sigstore will issue certificates to those identities, so a compromised account produces perfectly valid signatures.; Private Internet Access monthly plan is priced noticeably higher than the discounted multi-year commitments, penalizing short-term users.
  • They diverge on capability: Cosign covers Keyless signing, Private Internet Access covers Split tunneling.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cosign and Private Internet Access actually diverge.

Attributes where Cosign and Private Internet Access differ
AttributeCosignPrivate Internet Access
Starting priceFree$11.99/month
Pricing modelOpen source, no licence feesubscription
Free tierYesNo
PlatformsmacOS, Linux, Windows, Dockerwindows, mac, linux, ios, android

Identical on both: user rating (Not yet rated), category (Cybersecurity).

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 Cosign

  • Keyless signing
  • Key and KMS signing
  • Registry-native storage
  • In-toto attestations
  • Offline verification
  • Trusted root and signing config

Only in Private Internet Access

  • Split tunneling
  • Kill switch
  • Ad and tracker blocking
  • Dedicated IP add-on
  • Bundled antivirus add-on

What people use each for

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

Cosign

  • Signing container images in a build pipeline without managing long-lived private keysnot Private Internet Access
  • Attaching a signed bill of materials to a release so consumers can verify its provenancenot Private Internet Access
  • Meeting a customer or regulatory requirement for signed artifactsnot Private Internet Access
  • Verifying third-party images before they enter an internal registrynot Private Internet Access

Private Internet Access

  • Encrypting traffic on public Wi-Fi with a kill switchnot Cosign
  • Blocking ads and trackers network-wide via MACEnot Cosign
  • Maintaining a consistent connection identity with a dedicated IP add-onnot Cosign
  • Committing to a long-term plan for a lower effective monthly ratenot Cosign

Where each one falls short

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

Cosign

  • Keyless signing inherits every weakness of the identity provider behind it. Sigstore’s own threat model states that if an identity provider is compromised, Sigstore will issue certificates to those identities, so a compromised account produces perfectly valid signatures.
  • A signature proves who signed, never whether they should have. The documentation is explicit that Sigstore cannot determine authorisation, so every consumer must write and maintain their own identity and issuer policy or verification means nothing.
  • Nothing is enforced without an admission controller. Signing changes what you can prove, not what runs, and the official policy controller has a small maintainer base for a component sitting in a cluster admission path.
  • Upgrades break pipelines. Version 3 changed defaults, version 4 is announced as removing legacy functionality and roughly half the command line flags, and two official client libraries still lacked support for the new log format as of mid 2026.
  • Signatures do not expire. An artifact signed before a maintainer account was compromised and one signed after are indistinguishable unless somebody is actively monitoring the transparency log, and almost nobody is.

Private Internet Access

  • Monthly plan is priced noticeably higher than the discounted multi-year commitments, penalizing short-term users.
  • Dedicated IP and antivirus are paid add-ons rather than included features.
  • Headquartered in a jurisdiction whose privacy reputation some competitors market against, despite audited no-logs claims.
  • App interface is less streamlined than some higher-priced premium VPN competitors.

Pricing, plan by plan

Cosign

Free
  • CosignFree
    • Apache-2.0
    • Public Sigstore infrastructure free to use
    • No usage limits published

Private Internet Access

$11.99/month
  • Monthly$11.99/month
    • Billed month to month
    • Full server network access
    • 30-day money-back guarantee
  • 1-Year$3.1/month
    • Billed annually at $37.19
    • Full server network access
  • 2-Year$2.19/month
    • Lowest advertised rate, billed every 2 years
    • Full server network access

Which should you pick?

Choose Cosign if

  • You need keyless signing.
  • You want to start without paying.
  • You work on macOS, Linux, Windows, Docker.
  • You also want key and kms signing.
Cosign review

Choose Private Internet Access if

  • You need split tunneling.
  • You work on windows, mac, linux, ios, android.
  • You also want kill switch.
Private Internet Access review

Questions people ask

Is Cosign or Private Internet Access better?
Neither clearly leads. Cosign starts at Free and Private Internet Access at $11.99/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cosign or Private Internet Access?
Cosign has a free tier; the other does not. Paid plans start at Free for Cosign and $11.99/month for Private Internet Access.
Does Cosign or Private Internet Access run on more platforms?
Cosign runs on macOS, Linux, Windows, Docker. Private Internet Access runs on windows, mac, linux, ios, android.
Can I use Cosign for free?
Yes. Cosign has a free tier, so you can try it without paying. Private Internet Access starts at $11.99/month.
What is Cosign best used for?
Cosign is most often used for signing container images in a build pipeline without managing long-lived private keys, attaching a signed bill of materials to a release so consumers can verify its provenance, meeting a customer or regulatory requirement for signed artifacts, verifying third-party images before they enter an internal registry. Of those, signing container images in a build pipeline without managing long-lived private keys and attaching a signed bill of materials to a release so consumers can verify its provenance are not what Private Internet Access is typically brought in for.
What can Cosign do that Private Internet Access cannot?
Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Private Internet Access covers Split tunneling, Kill switch, Ad and tracker blocking, Dedicated IP add-on.

Answered from the vendors’ own pages

Cosign: Does Cosign tell me if an image is vulnerable?

No. It has no vulnerability knowledge whatsoever. It can carry an SBOM as a signed attestation but never reads it. Pair it with a scanner.

Cosign: Is signing alone enough?

No. Verification is a command somebody runs. Without an admission controller enforcing it, an unsigned image still runs.

Cosign: What does a bare cosign verify actually prove?

Very little. Without a pinned certificate identity and OIDC issuer, it accepts a valid signature from any identity at all.

Cosign: What is the risk of keyless signing?

Your OIDC provider becomes the root of trust. Compromise of that account yields genuine, verifiable signatures, so account security is the control that matters.

Cosign: Should we expect breaking changes?

Yes. Version 4 is announced to remove roughly half the flags, and a post-quantum migration is named as a further breaking change after that.

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