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Cybersecurity · head to head

ProtonVPN vs Sigstore

ProtonVPN logo

ProtonVPN

Cybersecurity

High-speed Swiss VPN that safeguards your privacy

From
Free
Rated
-
Full reviewWebsite
Sigstore logo

Sigstore

Cybersecurity

Free public signing and transparency infrastructure for open source artifacts

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: ProtonVPN free plan limited to one device at a time; Sigstore the security model depends on somebody watching the log. The documentation states that compromise of an identity provider or of Fulcio itself is detectable only if third parties monitor the transparency log, the monitoring tool is a community-tier rather than core project, and almost no consumer runs one.
  • They diverge on capability: ProtonVPN covers No-logs policy, Sigstore covers Fulcio.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which ProtonVPN and Sigstore actually diverge.

Attributes where ProtonVPN and Sigstore differ
AttributeProtonVPNSigstore
Pricing modelfreemiumOpen source, public instance free to use
PlatformsWindows, macOS, Linux, iOS, AndroidWeb, Linux, macOS, Windows, Self-hosted
Founded2014Unknown

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 ProtonVPN

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

Only in Sigstore

  • Fulcio
  • Rekor
  • Keyless signing
  • Multi-language clients
  • Timestamp authority
  • Neutral governance

What people use each for

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

ProtonVPN

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

Sigstore

  • Open source projects signing releases without running a certificate authoritynot ProtonVPN
  • Organisations meeting a signed-artifact requirement without buying a signing productnot ProtonVPN
  • Publishing provenance that a consumer can verify independently of younot ProtonVPN
  • Self-hosting the same components where a public log is unacceptablenot ProtonVPN

Where each one falls short

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

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

Sigstore

  • The security model depends on somebody watching the log. The documentation states that compromise of an identity provider or of Fulcio itself is detectable only if third parties monitor the transparency log, the monitoring tool is a community-tier rather than core project, and almost no consumer runs one.
  • It is a 99.5 percent objective with no service level agreement, which permits several hours of downtime a month and offers no remedy. A pipeline that signs on every build has taken a hard dependency on a free service with no contract behind it.
  • Log scale is a live engineering problem rather than a theoretical one. The active shard holds billions of entries, the log has already been sharded twice, and sharding version 1 requires stopping traffic, which is why a replacement was built.
  • Ten-minute certificates make trust depend on log availability. Verifying an older signature relies on the log entry proving it was made inside that window, so a lost or unreachable entry can render a valid artifact unverifiable.
  • Migration debt is substantial and ongoing. Version 2 of the log is generally available but not the public default, the signing client has an announced breaking release ahead, some official clients lag the new log format, and a post-quantum migration is named as the next break after that.

Pricing, plan by plan

ProtonVPN

Free

No published plan breakdown. See the ProtonVPN review.

Sigstore

Free
  • Public good instanceFree
    • Free to everyone with no contract
    • 99.5 percent availability objective, not an agreement
    • 100KB cap per attestation upload
  • Self-hostedFree
    • Apache-2.0
    • Run your own Fulcio and Rekor
    • Rekor v2 available for self-hosters

Which should you pick?

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

Choose Sigstore if

  • You need fulcio.
  • You want to start without paying.
  • You work on Web, Linux, macOS, Windows, Self-hosted.
  • You also want rekor.
Sigstore review

Questions people ask

Is ProtonVPN or Sigstore better?
Neither clearly leads. ProtonVPN starts at Free and Sigstore at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ProtonVPN or Sigstore?
ProtonVPN starts at Free and Sigstore at Free.
Does ProtonVPN or Sigstore run on more platforms?
ProtonVPN runs on Windows, macOS, Linux, iOS, Android. Sigstore runs on Web, Linux, macOS, Windows, Self-hosted.
Can I use ProtonVPN for free?
Both have a free tier, so you can try either at no cost before committing.
What is ProtonVPN best used for?
ProtonVPN is most often used for privacy-focused browsing without subscription cost, multi-device protection with plus plan supporting 10 devices, integrated access to proton email and cloud services via unlimited plan. Of those, privacy-focused browsing without subscription cost and multi-device protection with plus plan supporting 10 devices are not what Sigstore is typically brought in for.
What can ProtonVPN do that Sigstore cannot?
ProtonVPN covers No-logs policy, Secure Core, Kill Switch, DNS leak protection. Sigstore covers Fulcio, Rekor, Keyless signing, Multi-language clients.

Answered from the vendors’ own pages

Sigstore: Is the public instance really free?

Yes, with no contract and no paid tier. That is also the weakness: a 99.5 percent objective with no agreement, no remedy and support through Slack.

Sigstore: Has the public log moved to Rekor v2?

No. Version 2 reached general availability in October 2025 and self-hosters can use it, but the public instance still defaults to version 1 and the project has said it will for the foreseeable future.

Sigstore: Does Sigstore make my dependencies safe?

No, and this is a category error worth avoiding. It tells you who published something. It has no knowledge of what the artifact contains or whether it is vulnerable.

Sigstore: What are the rate limits?

Not published. Only the 100KB cap per attestation upload is documented, so do not design a high-volume pipeline around assumed throughput.

Sigstore: Should we self-host it?

If a public record of every signature is unacceptable, or if a free service with no agreement cannot sit in your build path, then yes. Otherwise the public instance is what most projects use.

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