Choose Blacksmith if you need
- Ubuntu, Windows or macOS. We haven't found them on Semaphore's website.
- Integration with GitHub Actions or Docker. We haven't found them on Semaphore's website.
At a glance
- Blacksmith has a free plan. We haven't confirmed one for Semaphore.
- Blacksmith's lowest paid plan is macOS M4 at $0.08 per minute, as of October 28, 2026.
- Only Blacksmith lists Ubuntu, Windows and macOS.
- Only Semaphore lists CLI and API.
- They list no integrations in common.
- Semaphore lists SOC 2, ISO 27001 and SSO. We haven't confirmed any of these for Blacksmith.
- Semaphore has a public API. We haven't confirmed one for Blacksmith.
- Semaphore can be self-hosted. We haven't confirmed that for Blacksmith.
From each tool's own website, checked on the dates below, and from published reviews.
Which to choose
From the facts checked for both tools, not from opinion. A fact we haven't confirmed for one of them is never counted.
Choose Semaphore if you need
- CLI or API. We haven't found them on Blacksmith's website.
- Integration with GitHub, Bitbucket or Slack. We haven't found them on Blacksmith's website.
Blacksmith
Nobody has reviewed Blacksmith yet. Its rating shows once it has 3 reviews.
Review Blacksmith
Semaphore
Nobody has reviewed Semaphore yet. Its rating shows once it has 3 reviews.
Review SemaphoreThe facts
- What it does
- BlacksmithA drop-in replacement for GitHub runners that runs your GitHub Actions faster and costs less.
- SemaphoreCI built for coding agents - fast, affordable, and enterprise-ready
- Free plan
- BlacksmithYes
- SemaphoreNot confirmed
- Pricing
- BlacksmithNot confirmed
- SemaphoreNot confirmed
- Paid plans from
What they share
From the platforms and integrations each website lists.
Platforms
BothNone in common
Only Blacksmith
- Ubuntu
- Windows
- macOS
Only Semaphore
- CLI
- API
Integrations
BothNone in common
Only Blacksmith
- GitHub Actions
People who switched
Reviewers who say they used one of these before the other.
No reviewer has said they moved between Blacksmith and Semaphore yet.
Used either of them?
Your review makes this comparison better for the next person. Review Blacksmith or review Semaphore.