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Developer Tools · head to head

Earthly vs NixOS

Earthly logo

Earthly

Developer Tools

Engineering guardrails for the AI era

From
Free
Rated
-
Full reviewWebsite
NixOS logo

NixOS

Operating Systems

Linux distribution where the whole machine is defined in one declarative configuration and every change can be rolled back

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Earthly pricing model not published; requires sales contact; NixOS the Nix language is a prerequisite, not an optional extra, and error messages are frequently unhelpful, so the first month of adoption is slow for even experienced administrators.
  • They diverge on capability: Earthly covers Policy as code, NixOS covers Declarative configuration.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Earthly and NixOS actually diverge.

Attributes where Earthly and NixOS differ
AttributeEarthlyNixOS
Pricing modelNo pricing published on websiteOpen source, no licence fee
PlatformsWeb, CLIx86-64, ARM64, WSL, Containers, Cloud images, macOS via Nix package manager
CategoryDeveloper ToolsOperating Systems
Founded2020Unknown

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

  • Policy as code
  • Multi-stage enforcement
  • AI agent governance
  • Repository-wide policies
  • Incident response automation
  • Compliance management
  • Earthfiles build tool
  • Satellites

Only in NixOS

  • Declarative configuration
  • Rollbacks by generation
  • Reproducible builds
  • Nixpkgs
  • Development shells
  • Home Manager

What people use each for

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

Earthly

  • Enforcing engineering standards across AI and human developersnot NixOS
  • Automating incident response procedures across all repositoriesnot NixOS
  • Embedding compliance requirements into development workflowsnot NixOS
  • Standardizing build processes with Earthfilesnot NixOS

NixOS

  • Fleets where every machine must be provably identical rather than approximately identicalnot Earthly
  • Build and CI infrastructure that has to reproduce an old toolchain exactly, years laternot Earthly
  • Developer workstations where each project pins its own compiler and library versionsnot Earthly
  • Servers where an unattended upgrade must be revertible at boot without a restorenot Earthly

Where each one falls short

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

Earthly

  • Pricing model not published; requires sales contact
  • Earthly Lunar is a recent launch (2025) with limited track record
  • Primarily GitHub-focused; limited integration with other platforms
  • No public documentation on pricing or feature tiers

NixOS

  • The Nix language is a prerequisite, not an optional extra, and error messages are frequently unhelpful, so the first month of adoption is slow for even experienced administrators.
  • Flakes have been the practical standard while still marked experimental, which splits tutorials, blog posts and manuals into two incompatible styles and makes searching for answers frustrating.
  • There is no conventional filesystem hierarchy, so downloaded binaries, vendor installers and anything expecting /usr/lib fail until wrapped with steam-run, an FHS environment or patchelf.
  • Old generations and the store consume disk aggressively, and a machine that is never garbage collected will fill its root partition without any obvious cause.
  • Anything not already in Nixpkgs has to be packaged by you, which turns a five-minute install on another distribution into an afternoon of writing a derivation.

Pricing, plan by plan

Earthly

Free

No published plan breakdown. See the Earthly review.

NixOS

Free
  • NixOSFree
    • No licence fee or registration
    • All packages and channels
    • Binary cache hosted by the project

Which should you pick?

Choose Earthly if

  • You need policy as code.
  • You want to start without paying.
  • You work on Web, CLI.
  • You also want multi-stage enforcement.
Earthly review

Choose NixOS if

  • You need declarative configuration.
  • You want to start without paying.
  • You work on x86-64, ARM64, WSL, Containers, Cloud images, macOS via Nix package manager.
  • You also want rollbacks by generation.
NixOS review

Questions people ask

Is Earthly or NixOS better?
Neither clearly leads. Earthly starts at Free and NixOS at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Earthly or NixOS?
Earthly starts at Free and NixOS at Free.
Does Earthly or NixOS run on more platforms?
Earthly runs on Web, CLI. NixOS runs on x86-64, ARM64, WSL, Containers, Cloud images, macOS via Nix package manager.
Can I use Earthly for free?
Both have a free tier, so you can try either at no cost before committing.
What is Earthly best used for?
Earthly is most often used for enforcing engineering standards across ai and human developers, automating incident response procedures across all repositories, embedding compliance requirements into development workflows, standardizing build processes with earthfiles. Of those, enforcing engineering standards across ai and human developers and automating incident response procedures across all repositories are not what NixOS is typically brought in for.
What can Earthly do that NixOS cannot?
Earthly covers Policy as code, Multi-stage enforcement, AI agent governance, Repository-wide policies. NixOS covers Declarative configuration, Rollbacks by generation, Reproducible builds, Nixpkgs.

Answered from the vendors’ own pages

Earthly: What is the difference between Earthfiles and Earthly Lunar?

Earthfiles is an open-source build tool that reached 12,000 GitHub stars and is used by companies like NVIDIA, Intel, and Databricks. Earthly Lunar is a separate governance platform launched in 2025 for enforcing standards across development workflows.

Source
NixOS: Do I need NixOS to use Nix?

No. The Nix package manager and development shells work on other Linux distributions and on macOS, which is how most teams try it before committing a machine to NixOS.

Earthly: How does Earthly Lunar enforce standards?

Lunar converts engineering standards, compliance requirements, and processes documented in AGENTS.md files, wikis, and incident postmortems into enforceable guardrails that apply consistently across repositories and development stages.

Source
NixOS: Are flakes safe to use in production?

They are widely used in production and are the standard way to pin inputs, but they are still formally experimental and must be enabled by a flag. Treat the documentation split as the real cost, not instability.

Earthly: What is the pricing for Earthly Lunar?

Pricing is not published on the website. Interested customers should contact Earthly's sales team for current pricing and feature tiers.

Source
NixOS: What happened to the project leadership?

The founder stepped back as project lead in 2024 following a public governance dispute, an elected steering committee took over direction, and a fork drew off some contributors. Nixpkgs development continued throughout.

NixOS: How often are releases made?

Twice a year, versioned by year and month, plus a continuously updated unstable channel that many desktop users track instead.

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