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Developer Tools · head to head

Earthly vs Ruby on Rails

Earthly logo

Earthly

Developer Tools

Engineering guardrails for the AI era

From
Free
Free plan
Yes
Full reviewWebsite
Ruby on Rails logo

Ruby on Rails

Web Development

A full-stack framework for building web applications

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Earthly pricing model not published; requires sales contact; Ruby on Rails licensed under the MIT License per rubyonrails.org; as open source software it has no paid tier or vendor price to compare
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Earthly and Ruby on Rails actually diverge.

Attributes where Earthly and Ruby on Rails differ
AttributeEarthlyRuby on Rails
Pricing modelNo pricing published on websiteopen-source
PlatformsWeb, CLIWeb
CategoryDeveloper ToolsWeb Development
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 Ruby on Rails

Nothing recorded that Earthly does not also cover.

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 Ruby on Rails
  • Automating incident response procedures across all repositoriesnot Ruby on Rails
  • Embedding compliance requirements into development workflowsnot Ruby on Rails
  • Standardizing build processes with Earthfilesnot Ruby on Rails

Ruby on Rails

  • Building e-commerce platforms that scale from startup to IPOnot Earthly
  • Developing SaaS applications with consistent conventions across teamsnot Earthly
  • Creating marketplace platforms like Airbnb with transactional workflowsnot Earthly
  • Integrating cloud file storage and real-time WebSocket updatesnot Earthly
  • Enforcing encryption and security protections against common attacksnot 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

Ruby on Rails

  • Licensed under the MIT License per rubyonrails.org; as open source software it has no paid tier or vendor price to compare
  • The framework is Ruby-only by design, per rubyonrails.org's own description of its convention over configuration approach, requiring the Ruby runtime rather than supporting alternate languages

Pricing, plan by plan

Earthly

Free

No published plan breakdown. See the Earthly review.

Ruby on Rails

Free

No published plan breakdown. See the Ruby on Rails review.

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 Ruby on Rails if

  • You want to start without paying.
Ruby on Rails review

Questions people ask

Is Earthly or Ruby on Rails better?
Neither clearly leads. Earthly starts at Free and Ruby on Rails at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Earthly or Ruby on Rails?
Earthly starts at Free and Ruby on Rails at Free.
Does Earthly or Ruby on Rails run on more platforms?
Earthly runs on Web, CLI. Ruby on Rails runs on Web.
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 Ruby on Rails is typically brought in for.
What can Earthly do that Ruby on Rails cannot?
Earthly covers Policy as code, Multi-stage enforcement, AI agent governance, Repository-wide policies.

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
Ruby on Rails: Is Ruby on Rails free?

Yes, Ruby on Rails is free and open-source, licensed under the MIT License. There are no costs associated with using or distributing the framework.

Source
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
Ruby on Rails: What is Ruby on Rails licensed under?

Ruby on Rails is licensed under the MIT License, a permissive open-source license that allows commercial and private use.

Source
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
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