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Cybersecurity · head to head

Bitdefender VPN vs Cosign

Bitdefender VPN logo

Bitdefender VPN

Cybersecurity

Consumer VPN sold by Bitdefender that runs on network infrastructure licensed from a third party rather than its own.

From
On request
Rated
-
Full reviewWebsite
Cosign logo

Cosign

Cybersecurity

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

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Cosign has a free tier, so it costs nothing to try first.
  • Each has a real cost: Bitdefender VPN the network is not Bitdefender's: the servers and the Catapult Hydra protocol are licensed from Aura, formerly Pango and AnchorFree, so the company physically handling your traffic and subject to legal process is a United States based third party, not the Romanian vendor whose brand is on the client.; 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.
  • They diverge on capability: Bitdefender VPN covers Suite integration, Cosign covers Keyless signing.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Bitdefender VPN and Cosign actually diverge.

Attributes where Bitdefender VPN and Cosign differ
AttributeBitdefender VPNCosign
Starting priceOn requestFree
Pricing modelsubscriptionOpen source, no licence fee
Free tierNoYes
PlatformsWebmacOS, Linux, Windows, Docker

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 Bitdefender VPN

  • Suite integration
  • Catapult Hydra transport
  • WireGuard support
  • Kill switch
  • Auto-connect rules
  • Split tunnelling
  • Ad and tracker blocking
  • Free tier included

Only in Cosign

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

What people use each for

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

Bitdefender VPN

  • An existing Bitdefender customer who wants basic tunnel protection on public Wi-Fi without evaluating and buying a second productnot Cosign
  • Households wanting one security subscription covering malware protection and casual VPN use across a few devicesnot Cosign
  • Hiding browsing activity from an internet service provider or a shared network operator rather than defeating a determined adversarynot Cosign
  • Occasional access to region-locked content where a dedicated streaming-focused VPN would be more product than the need justifiesnot Cosign

Cosign

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

Where each one falls short

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

Bitdefender VPN

  • The network is not Bitdefender's: the servers and the Catapult Hydra protocol are licensed from Aura, formerly Pango and AnchorFree, so the company physically handling your traffic and subject to legal process is a United States based third party, not the Romanian vendor whose brand is on the client.
  • Catapult Hydra is proprietary and closed source, so unlike OpenVPN or WireGuard there is no public implementation for researchers to audit, and a buyer choosing on cryptographic grounds has nothing to inspect.
  • There is no published independent no-logs audit of this service comparable to the Deloitte, PwC and KPMG engagements the standalone VPN vendors commission, so the no-logging position rests on the privacy policies of two separate companies rather than on any external assurance.
  • The free tier bundled with the antivirus suites is capped at a small daily allowance and selects the server for you, so it is a demonstration rather than a usable VPN, and customers who assumed their suite included a VPN find they need a further paid upgrade.
  • Feature depth is well below the dedicated market: no port forwarding, no dedicated IP, no multi-hop, no city-level server selection and no Linux or router client, so routers, NAS devices, consoles and anything needing an inbound connection cannot be covered at all.

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.

Pricing, plan by plan

Bitdefender VPN

On request

No published plan breakdown. See the Bitdefender VPN review.

Cosign

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

Which should you pick?

Choose Bitdefender VPN if

  • You need suite integration.
  • You also want catapult hydra transport.
Bitdefender VPN review

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

Questions people ask

Is Bitdefender VPN or Cosign better?
Neither clearly leads. Bitdefender VPN starts at On request and Cosign at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Bitdefender VPN or Cosign?
Cosign has a free tier; the other does not. Paid plans start at On request for Bitdefender VPN and Free for Cosign.
Does Bitdefender VPN or Cosign run on more platforms?
Bitdefender VPN runs on Web. Cosign runs on macOS, Linux, Windows, Docker.
Can I use Cosign for free?
Yes. Cosign has a free tier, so you can try it without paying. Bitdefender VPN starts at On request.
What is Bitdefender VPN best used for?
Bitdefender VPN is most often used for an existing bitdefender customer who wants basic tunnel protection on public wi-fi without evaluating and buying a second product, households wanting one security subscription covering malware protection and casual vpn use across a few devices, hiding browsing activity from an internet service provider or a shared network operator rather than defeating a determined adversary, occasional access to region-locked content where a dedicated streaming-focused vpn would be more product than the need justifies. Of those, an existing bitdefender customer who wants basic tunnel protection on public wi-fi without evaluating and buying a second product and households wanting one security subscription covering malware protection and casual vpn use across a few devices are not what Cosign is typically brought in for.
What can Bitdefender VPN do that Cosign cannot?
Bitdefender VPN covers Suite integration, Catapult Hydra transport, WireGuard support, Kill switch. Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations.

Answered from the vendors’ own pages

Bitdefender VPN: Who actually operates the servers?

The underlying VPN network and the Catapult Hydra protocol are licensed from Aura, previously known as Pango and AnchorFree, the operator of Hotspot Shield. Bitdefender identifies the arrangement in its VPN terms. Your traffic therefore passes through a United States based provider's infrastructure.

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.

Bitdefender VPN: Is the free version enough?

Only as a taster. It is capped at a small daily traffic allowance and chooses the server itself, which rules out streaming and any sustained use. It exists to demonstrate the feature inside the antivirus suite.

Cosign: Is signing alone enough?

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

Bitdefender VPN: Has the no-logs claim been independently audited?

There is no published independent no-logs audit of this service equivalent to those commissioned by the dedicated VPN providers. If an audited no-logging claim is what you are buying, this is not the product for it.

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.

Bitdefender VPN: Does it work with streaming services?

Sometimes, but it is not built around that use case, there is no per-service server labelling, and there is no commitment to restoring access when a platform blocks a range. A streaming-focused provider is a better fit if that is the reason you want a VPN.

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.

Bitdefender VPN: Can I run it on Linux or a router?

No. There is no Linux client and no router firmware or manual configuration option, so coverage is limited to the Windows, macOS, iOS and Android clients.

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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