Earthly
Containerized build tool that combines Dockerfile and Makefile into a unified Earthfile syntax. Every build step runs in a container, making builds reproducible across local dev, CI, and CD environments. Earthly eliminates 'works on my machine' CI failures by ensuring the same containerized environment everywhere. Supports parallelism, caching, and composable build targets. Earthly Satellites (cloud) provides remote build execution and shared caching.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Builds run in containers — isolation from host system. Secrets passed via environment variables or --secret flag (not stored in Earthfile). Docker layer security applies. Self-hosted builds have no external data transmission. BSL license is source-available for auditability.
⚡ Reliability
Best When
You want reproducible builds that work identically in local dev and CI, especially in polyglot monorepos where environment consistency is critical.
Avoid When
You need a full CI/CD platform — Earthly is a build tool. If your primary pain isn't build reproducibility, simpler Makefiles or GitHub Actions suffice.
Use Cases
- • Define reproducible multi-step build pipelines in Earthfiles that run identically on developer laptops and in CI without environment drift
- • Parallelize build steps across multiple targets to reduce CI pipeline duration using Earthly's parallel execution and remote caching
- • Build multi-language monorepo projects with consistent containerized environments for each language/service without per-project CI configuration drift
- • Use Earthly Satellites (cloud remote execution) via API for faster builds with shared cache layers across team members and CI
- • Integrate agent-generated code into build pipelines that validate, test, and package outputs in reproducible containerized environments
Not For
- • Full CI/CD orchestration — Earthly is a build tool, not a CI platform; pair with GitHub Actions, GitLab CI, or Jenkins for orchestration
- • Non-containerized build environments — Earthly requires Docker; teams on non-Docker CI runners may have compatibility issues
- • Complex deployment workflows — Earthly handles build/test/package; use Argo CD, Spinnaker, or Harness for the deployment half
Interface
Authentication
Earthly Satellites (cloud) uses API tokens for authentication via `earthly account login --token`. Open source CLI has no auth. Tokens scoped to Earthly account. CI integration via EARTHLY_TOKEN environment variable.
Pricing
Earthly CLI (BSL 1.1 license) is open source and free for most use cases. Earthly Satellites adds cloud remote execution and shared caching. BSL license has use restrictions — verify for commercial products that embed Earthly.
Agent Metadata
Known Gotchas
- ⚠ Earthly is a CLI tool, not a REST API — agents invoke it via shell (earthly +target) rather than HTTP calls; agent must have Docker and Earthly CLI installed in its execution environment
- ⚠ Earthfile syntax is distinct from Dockerfile (COPY +artifact/path, RUN commands differ) — LLM-generated Earthfiles may have syntax errors requiring iteration
- ⚠ First build pulls Docker images and warms cache — initial build times can be 5-10x slower than subsequent cached builds; agents should account for cold-start builds
- ⚠ Earthly Satellites require network connectivity to Earthly's satellite infrastructure — airgapped environments must use self-hosted remote caching instead
- ⚠ BUILD --pass-args is required to forward ARGs to referenced targets — missing ARG propagation causes silent default value substitution, not obvious errors
- ⚠ Docker-in-Docker (DinD) required for Earthly in containerized CI environments — privileged containers or special CI configurations needed for nested Docker
- ⚠ BSL 1.1 license has commercial use restrictions that differ from Apache 2.0 — verify licensing before embedding Earthly in commercial products or SaaS offerings
Alternatives
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Scores are editorial opinions as of 2026-03-06.