Apple container vs Charliecloud

Apple container creates and runs Linux containers as lightweight virtual machines on a Mac. Written in Swift and optimized for Apple silicon, it gives each container its own lightweight virtual machine with core utilities and libraries. Host data is shared by mounting only the data needed inside each virtual machine. The tool consumes and produces OCI-compatible images that can be pulled from and pushed to standard registries. Documented features include CPU and memory limits, bind mounts, named volumes, tmpfs, DNS-based names, port forwarding, and isolated networks. It can run local single-node or multi-node Kubernetes clusters for development and testing, and documentation covers building, running, and publishing images for Apple silicon and x86-64. Integrations include macOS Virtualization, vmnet, XPC, launchd, Keychain services, and unified logging. Apple container is free, Apache-2.0 licensed, and supported on macOS 26, but requires Apple silicon. The project is under active development.

Charliecloud is free, open-source container software for high-performance computing on Linux. It runs containers without privileged operations or daemons by using Linux user namespaces, with minimal configuration changes on computing-center resources. Users can build images, push and pull them to registries, and use accelerators such as GPUs. Its layer-free build cache is based on Git rather than union-mount filesystems and tarballs, and Dockerfiles are parsed with a formal grammar. The ch-image tool supports registry authentication and registries including GitLab Container Registry. At runtime, ch-run can inject host resources through the Container Device Interface, including NVIDIA GPUs and Cray networking. Installation is available from a release tarball, Git checkout, Spack, or Fedora/EPEL. Charliecloud requires Linux user namespaces and has been run on x86-64, ARM, and Power; current testing covers x86_64 and ARM. It is distributed under Apache License, Version 2.0. The project supports only the current release and provides no internal security boundary.