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Developer Tools · head to head

Blacksmith vs Estuary

Blacksmith logo

Blacksmith

Developer Tools

2x faster GitHub Actions with 60% cost savings

From
Free
Free plan
Yes
Visit BlacksmithFull review
Estuary logo

Estuary

Databases

Real-time data integration combining streaming, CDC, and batch

From
Free
Free plan
Yes
Visit EstuaryFull review

The short version

  • Blacksmith is a GitHub Actions runner service.
  • Free plans on both; paid from $0.004/mo and $0.5/mo.
  • Only Blacksmith lists bare metal runners; only Estuary lists real-time data delivery.
  • Where Blacksmith falls short: per-minute pricing model requires estimating usage to predict costs.
  • Where Estuary falls short: Per-GB pricing adds up quickly for high-volume scenarios.
  • Prices and features on this page were last checked on 29 August 2026.

Where they differ

Only the attributes on which Blacksmith and Estuary actually diverge.

Attributes where Blacksmith and Estuary differ
AttributeBlacksmithEstuary
PlatformsGitHub Actions, Linux, Windows, macOSWeb, BYOC
CategoryDeveloper ToolsDatabases

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

Not yet recorded: pricing model for Blacksmith, founded for Blacksmith.

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 Blacksmith

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

Only in Estuary

  • Real-time data delivery
  • Change data capture
  • Batch processing
  • Data transformation
  • Pre-built connectors
  • Multiple deployments
  • RBAC and monitoring

What people use each for

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

Blacksmith

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

Estuary

  • Real-time data replication to data warehousesnot Blacksmith
  • Change data capture from operational databasesnot Blacksmith
  • Feeding analytics and BI systems with fresh datanot Blacksmith
  • Powering real-time AI and ML data pipelinesnot Blacksmith

Where each one falls short

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

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

Estuary

  • Per-GB pricing adds up quickly for high-volume scenarios
  • No transparent per-connector volume discounts below 6 connectors
  • Limited to data movement; transformation capabilities are basic
  • BYOC and private deployment requires enterprise plan
  • Smaller ecosystem compared to established alternatives

Pricing, plan by plan

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

Estuary

Free
  • DeveloperFree
    • 10 GB per month
    • 2 connector instances maximum
    • No credit card required
  • Cloud$0.5/gb
    • $0.50 per GB of data moved
    • $100 per connector monthly (6+ connectors $50 each)
    • 200+ connectors
  • EnterpriseOn request
    • Volume-based discounts
    • SOC 2 and HIPAA compliance
    • SSO authentication

Which should you pick?

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

Choose Estuary if

  • You need real-time data delivery.
  • You want to start without paying.
  • You work on Web, BYOC.
  • You also want change data capture.
Estuary review

Questions people ask

Is Blacksmith or Estuary better?
Neither clearly leads. Blacksmith starts at Free and Estuary at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Blacksmith or Estuary?
Blacksmith starts at Free and Estuary at Free.
Does Blacksmith or Estuary run on more platforms?
Blacksmith runs on GitHub Actions, Linux, Windows, macOS. Estuary runs on Web, BYOC.
Can I use Blacksmith for free?
Both have a free tier, so you can try either at no cost before committing.
What is Blacksmith best used for?
Blacksmith is most often used for replacing github actions runners with faster, cheaper infrastructure, accelerating ci build times for organizations with heavy ci load, reducing cloud spend on github actions by 60% or more, supporting arm architecture builds without github runners. Of those, replacing github actions runners with faster, cheaper infrastructure and accelerating ci build times for organizations with heavy ci load are not what Estuary is typically brought in for.
What can Blacksmith do that Estuary cannot?
Blacksmith covers Bare metal runners, Multiple OS support, ARM support, Docker layer caching. Estuary covers Real-time data delivery, Change data capture, Batch processing, Data transformation.

Answered from the vendors’ own pages

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
Estuary: What is included in the free Developer plan?

Developer plan ($0/month) includes 10 GB of data per month and up to 2 connector instances, no credit card required.

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
Estuary: How is data pricing calculated on Cloud plan?

Cloud plan charges $0.50 per GB of data moved plus $100/month per connector for the first 6 connectors, then $50/month for additional connectors.

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
Estuary: What discount is available when adding 6+ connectors?

When using 6 or more connectors, the per-connector cost drops to $50/month from $100/month, saving $50 per additional connector.

Source
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