Guides
What GitHub Actions runners cost, what they hold, and how to make a job fit: every price and spec from the vendor's own page, with the date we read it.
Tools
- GitHub Actions cost calculator
Your minutes a month at each memory size, priced on GitHub, Blacksmith, Ubicloud, Namespace and FlameWill, with and without free allowances.
Guides
- How to make GitHub Actions faster: six changes, measured first
Make GitHub Actions workflows faster by measuring the slowest job first, then skipping what does not need to run, caching dependencies, splitting tests into parallel shards, and choosing a runner with the memory the job needs.
- GitHub-hosted vs self-hosted vs managed runners: cost, effort and security
What changes between GitHub-hosted runners, runners you host yourself and managed runners: what GitHub bills, who keeps the machines patched, how each one isolates jobs, and which fits a public or a private repository.
- GitHub Actions on ARM64: ubuntu-24.04-arm, prices, and building arm64 images natively
How to run GitHub Actions jobs on ARM64 Linux runners (ubuntu-24.04-arm and others), what they cost and hold, what breaks when you switch, and how to build arm64 Docker images without emulation.
- GitHub Actions out of memory: exit code 137 and JavaScript heap out of memory
Why a GitHub Actions job dies with exit code 137 or "JavaScript heap out of memory", how to see how much memory it really used, and five ways to make it fit, from a setting to a bigger runner.
- GitHub Actions runner pricing in 2026, per minute, for every Linux runner
What a minute of a Linux GitHub Actions runner costs on GitHub-hosted runners and on the managed alternatives (Blacksmith, Ubicloud, Namespace, Depot, RunsOn, FlameWill), side by side at the same memory.
- GitHub Actions runner specs: CPU, memory and disk of every Linux runner
The CPU, memory and disk of every GitHub-hosted Linux runner (standard and larger, x64 and arm64, public and private repositories) and of the managed alternatives, and how to check them from a job.
Comparisons
- BuildJet alternatives after its shutdown: where to move buildjet runs-on labels
BuildJet for GitHub Actions shut down on 31 March 2026. What its own announcement recommended, and the runners that replace a buildjet-* label today, priced per minute at the same memory.
- Blacksmith alternatives in 2026: FlameWill, Ubicloud, Namespace, Depot and RunsOn compared
An honest comparison of Blacksmith with the other managed GitHub Actions runners (FlameWill, Ubicloud, Namespace, Depot, RunsOn) on price at equal memory, platforms, start time, caching and where they run, from each vendor's own pages.