Softwr

Developer Tools · head to head

Pants Build vs Blacksmith

Pants Build logo

Pants Build

Developer Tools

Fast, scalable build system with intelligent defaults for Python and more

From
Free
Rated
-
Full reviewWebsite
Blacksmith logo

Blacksmith

Developer Tools

2x faster GitHub Actions with 60% cost savings

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Pants Build smaller community compared to Bazel with fewer third-party tool integrations; Blacksmith per-minute pricing model requires estimating usage to predict costs
  • They diverge on capability: Pants Build covers Intelligent defaults, Blacksmith covers Bare metal runners.

Where they differ

Only the attributes on which Pants Build and Blacksmith actually diverge.

Attributes where Pants Build and Blacksmith differ
AttributePants BuildBlacksmith
Pricing modelopen-sourceUnknown
PlatformsLinux, macOS, WindowsGitHub Actions, Linux, Windows, macOS

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Developer Tools).

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 Pants Build

  • Intelligent defaults
  • Python-first design
  • Multiple dependency resolves
  • File-level operations
  • Git integration
  • Tool integrations
  • Python 3 plugin API

Only in Blacksmith

  • Bare metal runners
  • Multiple OS support
  • ARM support
  • Docker layer caching
  • Sticky disks
  • GitHub Actions observability
  • Free tier
  • Static IPs

What people use each for

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

Pants Build

  • Python-heavy monorepos with complex interdependenciesnot Blacksmith
  • Multi-language projects mixing Python, Go, and JVM languagesnot Blacksmith
  • Teams seeking minimal build configuration overheadnot Blacksmith
  • Organizations implementing Git-aware test selectionnot Blacksmith

Blacksmith

  • Replacing GitHub Actions runners with faster, cheaper infrastructurenot Pants Build
  • Accelerating CI build times for organizations with heavy CI loadnot Pants Build
  • Reducing cloud spend on GitHub Actions by 60% or morenot Pants Build
  • Supporting ARM architecture builds without GitHub runnersnot Pants Build

Where each one falls short

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

Pants Build

  • Smaller community compared to Bazel with fewer third-party tool integrations
  • Python plugin API steeper learning curve for custom build rules
  • Less mature ecosystem for non-Python languages
  • Fewer integration examples for enterprise CI/CD platforms

Blacksmith

  • Per-minute pricing model requires estimating usage to predict costs
  • macOS M4 pricing ($0.08/min) is significantly higher than GitHub Actions
  • Docker layer caching and sticky disks are paid add-ons at $0.50/GB/mo
  • Static IP add-on costs $100/IP/mo

Pricing, plan by plan

Pants Build

Free

No published plan breakdown. See the Pants Build review.

Blacksmith

Free
  • Ubuntu x64$0.004/minute
    • 3,000 free minutes per month
    • 2x faster hardware
    • 4x faster cache downloads
  • Ubuntu ARM$0.0025/minute
    • 3,000 free minutes per month
    • 2x faster hardware
    • 4x faster cache downloads
  • Windows x64$0.008/minute
    • 3,000 free minutes per month
    • 2x faster hardware
    • 4x faster cache downloads
  • macOS M4$0.08/minute
    • 3,000 free minutes per month
    • 2x faster hardware
    • 4x faster cache downloads

Which should you pick?

Choose Pants Build if

  • You need intelligent defaults.
  • You want to start without paying.
  • You work on Linux, macOS, Windows.
  • You also want python-first design.
Pants Build review

Choose Blacksmith if

  • You need bare metal runners.
  • You want to start without paying.
  • You work on GitHub Actions, Linux, Windows, macOS.
  • You also want multiple os support.
Blacksmith review

Questions people ask

Is Pants Build or Blacksmith better?
Neither clearly leads. Pants Build starts at Free and Blacksmith at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Pants Build or Blacksmith?
Pants Build starts at Free and Blacksmith at Free.
Does Pants Build or Blacksmith run on more platforms?
Pants Build runs on Linux, macOS, Windows. Blacksmith runs on GitHub Actions, Linux, Windows, macOS.
Can I use Pants Build for free?
Both have a free tier, so you can try either at no cost before committing.
What is Pants Build best used for?
Pants Build is most often used for python-heavy monorepos with complex interdependencies, multi-language projects mixing python, go, and jvm languages, teams seeking minimal build configuration overhead, organizations implementing git-aware test selection. Of those, python-heavy monorepos with complex interdependencies and multi-language projects mixing python, go, and jvm languages are not what Blacksmith is typically brought in for.
What can Pants Build do that Blacksmith cannot?
Pants Build covers Intelligent defaults, Python-first design, Multiple dependency resolves, File-level operations. Blacksmith covers Bare metal runners, Multiple OS support, ARM support, Docker layer caching.

Answered from the vendors’ own pages

Pants Build: What languages does Pants support?

Pants supports Python as a first-class citizen, with production-ready support for Go, Java, Scala, Kotlin, Shell scripts, and Docker.

Source
Blacksmith: How much do Blacksmith runners cost compared to GitHub Actions?

Blacksmith offers 60-75% cost savings depending on OS. Ubuntu x64 costs $0.004/min vs GitHub at $0.012/min. All plans include 3,000 free minutes monthly.

Source
Pants Build: Do I need to write BUILD files with Pants?

Pants uses static analysis to infer dependencies and project structure, minimizing required BUILD file configuration compared to other build systems.

Source
Blacksmith: Can I use Docker layer caching with Blacksmith?

Yes, Docker layer caching is available as an add-on at $0.50/GB/mo. Managed Docker layer persistence is included with the base service.

Source
Pants Build: How does Pants handle complex dependency scenarios?

Pants provides file-level dependency tracking, multiple dependency resolves with lockfiles, and sophisticated dependency analysis that works correctly even with circular or complex dependency graphs.

Source
Blacksmith: What is the SLA for Enterprise plans?

Enterprise Blacksmith plans include a 99.9% SLA guarantee along with 24/7 priority support, dedicated Slack channels, white-glove onboarding, and CI optimization support.

Source
Share

Related pages

More on Pants Build

More on Blacksmith

Keep looking

Other head to heads