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Developer Tools · head to head

Nix vs Paymo

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
Visit NixFull review
Paymo logo

Paymo

Project Management

Work & project management for teams

From
Free
Free plan
Yes
Visit PaymoFull review

The short version

  • Paymo is a work management solution.
  • Nix is free; Paymo starts at $5.9/mo.
  • Only Nix lists content-addressed store; only Paymo lists task management.
  • Where Paymo falls short: every advertised price rises after 3 months, with Plus going from $10.90 to $15.90 per user and Pro from $16.90 to $23.90.
  • Prices and features on this page were last checked on 13 November 2026.

Where they differ

Only the attributes on which Nix and Paymo actually diverge.

Attributes where Nix and Paymo differ
AttributeNixPaymo
Pricing modelOpen source, no licence feeFreemium
PlatformsLinux, macOS, WindowsWeb, iOS, Android, Windows, macOS
CategoryDeveloper ToolsProject Management

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

Not yet recorded: founded for Nix.

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 Paymo

  • Task management
  • Time tracking
  • Invoicing
  • Gantt charts
  • Resource scheduling
  • Slack
  • Google Workspace
  • Zapier

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 Paymo
  • Reproducing a research computation or a build years later from a pinned commit rather than a written recipenot Paymo
  • Managing a fleet of Linux servers declaratively with atomic rollback if a deployment breaks a servicenot Paymo
  • Building minimal container images from precise dependency closures instead of a base image plus a package managernot Paymo

Paymo

  • Time tracking for freelancersnot Nix
  • Project management for small teamsnot Nix
  • Invoice generation and client managementnot 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

Paymo

  • Every advertised price rises after 3 months, with Plus going from $10.90 to $15.90 per user and Pro from $16.90 to $23.90
  • The free plan allows 1 user, 1 client and 2 projects
  • The Solo plan is still capped at 3 clients and 5 projects
  • Gantt charts, task dependencies and scheduling require the Plus plan
  • Integrations are excluded from both the free and Solo plans

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

Paymo

Free
  • FreeFree
    • 1 user
    • unlimited time tracking
    • unlimited invoices
  • Solo$5.9/mo
    • 1 user
    • flat rate/retainer projects
    • 3 clients
  • Plus$10.9/mo
    • unlimited users
    • spreadsheet view
    • recurring tasks
  • Pro$16.9/mo
    • unlimited users
    • Gantt charts
    • task dependencies

Which should you pick?

Choose Nix if

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

Choose Paymo if

  • You need task management.
  • You want to start without paying.
  • You work on Web, iOS, Android, Windows, macOS.
  • You also want time tracking.
Paymo review

Questions people ask

Is Nix or Paymo better?
Neither clearly leads. Nix starts at Free and Paymo at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Nix or Paymo?
Nix starts at Free and Paymo at Free.
Does Nix or Paymo run on more platforms?
Nix runs on Linux, macOS, Windows. Paymo runs on Web, iOS, Android, Windows, macOS.
Can I use Nix for free?
Both have a free tier, so you can try either at no cost before committing.
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 Paymo is typically brought in for.
What can Nix do that Paymo cannot?
Nix covers Content-addressed store, Declarative system configuration, Atomic upgrades and rollback, nix develop shells. Paymo covers Task management, Time tracking, Invoicing, Gantt charts.

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.

Paymo: What is the storage limit by plan?

Free: 1GB, Solo: 5GB, Plus: 50GB, Pro: 500GB.

Source
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.

Paymo: Can I use Paymo with multiple users on the Free plan?

No, Free and Solo plans are limited to 1 user only. You need Plus or Pro for multiple users.

Source
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.

Paymo: What happens after the promotional pricing period ends?

Regular prices apply: Solo $9.90/month, Plus $15.90/user/month, Pro $23.90/user/month.

Source
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.

Paymo: Is there a discount for annual billing?

Yes, annual payment offers up to 40% discount compared to monthly billing.

Source
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