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Tech riderRev. 5 Oct 2026

ko

Ch 176.1of 32 Container Build Tools
  1. 1Runs onLinux, Mac, Windows
  2. 2CostsFree plan
  3. 3Build methoddaemonless
  4. 4Multi-architecture buildsYes
  5. 5Build cache backendsmultiple
  6. 6SBOM generationYes
6 lines stated Written from the maker's own pages: ko.build
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The ko homepage

Overview

ko is ranked #17 of 32 in container build tools on Specifiction. It runs on Linux, macOS, Windows. There is a free plan.

ko plans and pricing

All plans
ko Free Open source Go container image builder ko.build · 5 Oct 2026

Compared on container build tools

Build method
daemonlessko.build
Multi-architecture builds
Yesko.build
Build cache backends
multipleko.build
SBOM generation
Yesko.build

Facts

Purpose
ko is a simple, fast container image builder for Go applications.ko.build · 5 Oct 2026
How it builds
ko runs go build on the local machine and does not require Docker to be installed.ko.build · 5 Oct 2026
Best fit
ko is ideal for a single Go application with few or no dependencies on the operating system base image, such as applications without cgo or OS package dependencies.ko.build · 5 Oct 2026
Multi-platform builds
ko can build for all platforms supported by the configured base image or for selected platforms such as linux/amd64 and linux/arm64.ko.build · 5 Oct 2026
SBOMs
Since v0.9, ko generates and uploads an SPDX-format SBOM for every image by default; SBOM generation can be disabled with --sbom=none.ko.build · 5 Oct 2026
Kubernetes workflow
ko resolve builds images for ko:// references in Kubernetes YAML and replaces them with the resulting image references.ko.build · 5 Oct 2026
Registry authentication
ko supports registry credentials from Docker configuration and has built-in environment credential support for Google, Amazon, Azure, and GitHub container registries.ko.build · 5 Oct 2026
Integrations
ko provides a Terraform provider for using image builds in Infrastructure-as-Code workflows.ko.build · 5 Oct 2026
Static assets
ko bundles contents of an application's kodata directory into its image and exposes the image path through KO_DATA_PATH.ko.build · 5 Oct 2026
Debugging
The --debug build flag adds Delve and debug symbols to the image and runs the app in debug mode on port 40000; the feature is intended for development, not production.ko.build · 5 Oct 2026
Limitations
ko supports Go applications only, defaults to CGO_ENABLED=0, and requires OS packages to be available in the configured base image.ko.build · 5 Oct 2026
Install platforms
The installation guide documents Windows, macOS, and Linux installation options, including GitHub releases, package managers, and source installation.ko.build · 5 Oct 2026
Release verification
The installation guide describes verifying releases with GitHub Artifact attestations and says releases through v0.19.1 used SLSA provenance.ko.build · 5 Oct 2026
Community support
The project offers a bi-weekly community meeting and discussion in the #ko-build channel on Kubernetes Slack.ko.build · 5 Oct 2026
Project status
ko is a Cloud Native Computing Foundation Sandbox project.ko.build · 5 Oct 2026
Ideal use
ko is ideal for Go applications without many dependencies on the operating system base image, such as applications that do not use cgo or require OS packages.ko.build · 5 Oct 2026
Kubernetes
ko resolve replaces ko:// Go import paths in Kubernetes YAML with built image references, and ko apply can apply the resolved configuration.ko.build · 5 Oct 2026
Build cache
ko reuses the normal go build cache and avoids pushing image blobs already present in the remote registry.ko.build · 5 Oct 2026
Tool integrations
The FAQ lists integrations or support in Skaffold, goreleaser, Tekton, Carvel kbld, and Tilt.ko.build · 5 Oct 2026
Limit
ko only supports Go applications and works best when applications do not depend on the underlying image; builds use CGO_ENABLED=0 by default.ko.build · 5 Oct 2026
Windows image support
Windows container image support is described as new, experimental, and tenuous, and requires configuring a Windows base image.ko.build · 5 Oct 2026
Project and community
ko is a Cloud Native Computing Foundation Sandbox project, and its community page lists bi-weekly meetings and a Kubernetes Slack channel.ko.build · 5 Oct 2026

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