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Cybersecurity · head to head

Cosign vs LastPass

Cosign logo

Cosign

Cybersecurity

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

From
Free
Rated
-
Full reviewWebsite
LastPass logo

LastPass

Cybersecurity

Simplify online life with LastPass password manager

From
Free
Rated
-
Full reviewWebsite

The short version

  • 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.; LastPass free plan limited to 1 device type only
  • They diverge on capability: Cosign covers Keyless signing, LastPass covers Password vault.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cosign and LastPass actually diverge.

Attributes where Cosign and LastPass differ
AttributeCosignLastPass
Pricing modelOpen source, no licence feefreemium
PlatformsmacOS, Linux, Windows, DockerWeb, Desktop, Mobile
FoundedUnknown2008

Identical on both: starting price (Free), free tier (Yes), 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 LastPass

  • Password vault
  • Password generator
  • Autofill
  • Security dashboard
  • Dark web monitoring
  • Emergency access
  • Secure notes
  • Digital wallet

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 LastPass
  • Attaching a signed bill of materials to a release so consumers can verify its provenancenot LastPass
  • Meeting a customer or regulatory requirement for signed artifactsnot LastPass
  • Verifying third-party images before they enter an internal registrynot LastPass

LastPass

  • Password management and vault storagenot Cosign
  • Multi-device access and autofillnot Cosign
  • Dark web monitoring and security dashboardnot Cosign
  • Team collaboration with shared folders and policiesnot 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.

LastPass

  • Free plan limited to 1 device type only
  • Premium plan costs ~$3/month annually (30% discount applied)
  • Business Teams plan limited to up to 50 users maximum
  • Teams plan offers only 25 security policies
  • Business plan pricing ~$4/user/month
  • Business Max plan costs ~$7/user/month for advanced features

Pricing, plan by plan

Cosign

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

LastPass

Free
  • Free$undefined/mo
    • Unlimited password storage
    • Autofill
    • Dark web monitoring
  • Premium$undefined/month
    • Unlimited passwords
    • All devices
    • Password generator
  • Families$undefined/month
    • Premium features
    • Shared folders
    • Family manager dashboard

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 LastPass if

  • You need password vault.
  • You want to start without paying.
  • You work on Web, Desktop, Mobile.
  • You also want password generator.
LastPass review

Questions people ask

Is Cosign or LastPass better?
Neither clearly leads. Cosign starts at Free and LastPass at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cosign or LastPass?
Cosign starts at Free and LastPass at Free.
Does Cosign or LastPass run on more platforms?
Cosign runs on macOS, Linux, Windows, Docker. LastPass runs on Web, Desktop, Mobile.
Can I use Cosign for free?
Both have a free tier, so you can try either at no cost before committing.
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 LastPass is typically brought in for.
What can Cosign do that LastPass cannot?
Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. LastPass covers Password vault, Password generator, Autofill, Security dashboard.

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.

LastPass: Does LastPass have a free version?

Yes, LastPass offers a free plan with unlimited password storage, autofill, dark web monitoring, and basic password sharing, but it is limited to 1 device type.

Source
Cosign: Is signing alone enough?

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

LastPass: What devices does the free plan support?

The free plan is limited to 1 device type, meaning you must choose either desktop or mobile, not both.

Source
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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