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Nix vs Very Good Security

Nix logo

Nix

Developer Tools

Purely functional package manager and the NixOS distribution built on it, for byte-reproducible environments

From
Free
Free plan
Yes
Full reviewWebsite
Very Good Security logo

Very Good Security

Cybersecurity

Tokenisation proxy that keeps card and personal data out of your own systems and out of PCI scope

From
$1000/month
Free plan
No
Full reviewWebsite

The short version

  • Only Nix has a free tier, so it costs nothing to try first.
  • Each has a real cost: Nix the Nix language is lazy, dynamically typed and poorly documented, and its error messages frequently point at the wrong expression, so debugging a failing build is a skill that takes months rather than days to acquire.; Very Good Security vGS sits in the live path of every request carrying sensitive data, so its latency and availability become yours, and an outage in the proxy is a payment outage no matter how healthy your own systems are.
  • They diverge on capability: Nix covers Content-addressed store, Very Good Security covers Aliasing proxy.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Nix and Very Good Security actually diverge.

Attributes where Nix and Very Good Security differ
AttributeNixVery Good Security
Starting priceFree$1000/month
Pricing modelOpen source, no licence feePer month
Free tierYesNo
PlatformsLinux, macOS, Windows (via WSL)Web, API
CategoryDeveloper ToolsCybersecurity

Identical on both: 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 Nix

  • Content-addressed store
  • Declarative system configuration
  • Atomic upgrades and rollback
  • nix develop shells
  • Flakes
  • Nixpkgs
  • Binary caches
  • Home Manager

Only in Very Good Security

  • Aliasing proxy
  • PCI scope reduction
  • Network tokenisation
  • Processor optionality
  • Card issuing data
  • Vault and access controls
  • Data residency options
  • Compliance artefacts

What people use each for

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

Nix

  • A team that wants every developer and CI runner to use byte-identical toolchains without shipping a container for local worknot Very Good Security
  • Reproducing a research computation or a build years later from a pinned commit rather than a written recipenot Very Good Security
  • Managing a fleet of Linux servers declaratively with atomic rollback if a deployment breaks a servicenot Very Good Security
  • Building minimal container images from precise dependency closures instead of a base image plus a package managernot Very Good Security

Very Good Security

  • A marketplace facing its first PCI DSS Level 1 assessment that wants to keep card data off its own estate rather than harden a dozen servicesnot Nix
  • A merchant negotiating with a second acquirer that needs card credentials portable so the negotiation is real rather than theoreticalnot Nix
  • A fintech collecting bank account and identity documents that wants sensitive fields absent from logs, backups and analytics warehouses by constructionnot Nix
  • A card issuer that must display a full PAN in its own mobile app without the app or its backend touching cardholder datanot Nix

Where each one falls short

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

Nix

  • The Nix language is lazy, dynamically typed and poorly documented, and its error messages frequently point at the wrong expression, so debugging a failing build is a skill that takes months rather than days to acquire.
  • Flakes are the way essentially everyone uses Nix in 2026 and are still formally an experimental feature behind a flag, meaning tutorials, official documentation and real practice disagree with each other constantly.
  • Anything that expects a conventional Linux filesystem layout breaks: prebuilt binaries, language package managers that download their own toolchains, and proprietary vendor installers all need patching or an FHS-compatible wrapper.
  • Project governance has been publicly fractious, producing the Lix fork and the separately funded Determinate Systems distribution, so a new adopter now has to choose which Nix before they can start.
  • The /nix/store grows without bound until you garbage collect, and on a developer laptop with several pinned nixpkgs revisions it routinely reaches tens of gigabytes.

Very Good Security

  • VGS sits in the live path of every request carrying sensitive data, so its latency and availability become yours, and an outage in the proxy is a payment outage no matter how healthy your own systems are.
  • Token portability is the whole selling point yet leaving VGS means migrating tokens back out, a project the vendor has no incentive to streamline, so the lock-in you removed from your acquirer partly moves to VGS.
  • Entry pricing at around one thousand US dollars a month is real money for a pre-revenue fintech, and it buys volume-limited throughput, so cost scales with exactly the growth that made you buy it.
  • Scope reduction is not scope elimination: your QSA still assesses how you integrate, and teams regularly discover that a support tool or an internal admin screen pulled plaintext back in and dragged systems into scope again.
  • Proxy-based interception constrains how you design request flows, and non-standard payloads, streaming uploads or binary formats often need custom routing rules that make debugging production issues noticeably harder.

Pricing, plan by plan

Nix

Free
  • Nix and NixOSFree
    • LGPL-2.1 licensed, no commercial tier
    • Public binary cache at cache.nixos.org
    • Community support via forum, Matrix and GitHub

Very Good Security

$1000/month
  • Starter$1000/month
    • Aliasing proxy
    • Vault storage
    • PCI scope reduction
  • Growth$undefined/month
    • Network tokenisation
    • Multiple processors
    • Data residency options
  • Enterprise$undefined/year
    • Custom vault architecture
    • Dedicated support and SLA
    • Contractual compliance coverage

Which should you pick?

Choose Nix if

  • You need content-addressed store.
  • You want to start without paying.
  • You work on Linux, macOS, Windows (via WSL).
  • You also want declarative system configuration.
Nix review

Choose Very Good Security if

  • You need aliasing proxy.
  • You work on Web, API.
  • You also want pci scope reduction.
Very Good Security review

Questions people ask

Is Nix or Very Good Security better?
Neither clearly leads. Nix starts at Free and Very Good Security at $1000/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Nix or Very Good Security?
Nix has a free tier; the other does not. Paid plans start at Free for Nix and $1000/month for Very Good Security.
Does Nix or Very Good Security run on more platforms?
Nix runs on Linux, macOS, Windows (via WSL). Very Good Security runs on Web, API.
Can I use Nix for free?
Yes. Nix has a free tier, so you can try it without paying. Very Good Security starts at $1000/month.
What is Nix best used for?
Nix is most often used for a team that wants every developer and ci runner to use byte-identical toolchains without shipping a container for local work, reproducing a research computation or a build years later from a pinned commit rather than a written recipe, managing a fleet of linux servers declaratively with atomic rollback if a deployment breaks a service, building minimal container images from precise dependency closures instead of a base image plus a package manager. Of those, a team that wants every developer and ci runner to use byte-identical toolchains without shipping a container for local work and reproducing a research computation or a build years later from a pinned commit rather than a written recipe are not what Very Good Security is typically brought in for.
What can Nix do that Very Good Security cannot?
Nix covers Content-addressed store, Declarative system configuration, Atomic upgrades and rollback, nix develop shells. Very Good Security covers Aliasing proxy, PCI scope reduction, Network tokenisation, Processor optionality.

Answered from the vendors’ own pages

Nix: Do I have to run NixOS to use Nix?

No. The package manager runs fine on any Linux distribution and on macOS, and most teams start there with development shells rather than converting their servers.

Very Good Security: Does VGS make me PCI compliant?

No. It removes cardholder data from your systems so your assessment covers a far smaller boundary, but you still complete an assessment and your integration is part of it.

Nix: Is Nix a replacement for Docker?

It solves an adjacent problem. Nix reproduces the contents of an environment exactly; Docker distributes an image. Many teams use Nix to build the image.

Very Good Security: Can I move to another processor without re-collecting cards?

Yes, that is a core reason people buy it. The vault reveals stored credentials to whichever processor you route to.

Nix: Are flakes safe to use in production?

They are used in production widely and are stable in practice, but they remain officially experimental, which means the interface can still change and documentation is split.

Very Good Security: What does it cost?

Published entry pricing is about one thousand US dollars per month; growth and enterprise tiers are quoted.

Nix: What is Lix and should I care?

Lix is a community fork of the Nix implementation created after governance disputes. It is largely compatible; the practical impact is that you must decide which implementation your team standardises on.

Very Good Security: Is it only for card data?

No. The proxy handles any sensitive field, including bank details, national identifiers and documents, though payments is where the product is now focused.

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