Buildkite

Hosted: Linux x86_64 and ARM64, but ARM64 looks plan-gated — the docs say Enterprise only while the pricing page implies Pro includes it; Buildkite’s own pages disagree. Hosted macOS is Apple Silicon only (M4); hosted Windows is AMD64 only and ARM64 is explicitly unsupported. Self-hosted agents run fine on your own ARM hardware (official aarch64 packages).