Composer vs opam
Composer
getcomposer.orgopam
opam.ocaml.orgSide by side
| Figure | Composer | opam |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 0 |
| Spec score · Package Managers | 8.9 (#5) | 7.6 (#63) |
| Dependency resolution | Composer determines which package versions need to be installed and can update all dependencies in one command. | Yes |
| Free plan | Yes | Yes |
| Lockfile support | Yes | Yes |
| Offline installation | Yes | Yes |
| Package formats | PHP packages; ZIP; TAR; VCS repositories | opam package definition files and archives |
| Package sources | Composer uses Packagist by default and supports custom Composer, VCS, and local path repositories. | Packages can be pinned to a version, local path, archive, or Git, Mercurial, or Darcs repository. |
| Purpose | Composer is a tool for managing PHP project dependencies, installing and updating the libraries a project declares. | opam is a source-based package manager for OCaml. |
| Support | The project says commercial support and consulting are available through its sponsorship page. | Bug reports and feature requests go to opam's issue tracker; general queries can be addressed on the OCaml-platform mailing list. |
| Supported platforms | PHP; Windows; Linux; macOS | Linux,macOS,FreeBSD,OpenBSD,NetBSD,Windows |
Plans
In their own words
Composer
Composer manages dependencies for PHP projects, installing and updating the libraries each project declares. By default, it keeps those dependencies in a directory within the project, and it can also manage a global project. It resolves dependencies and supports lockfiles, workspaces, private registry authentication, and offline installation. Packagist is its default package source; custom Composer, version-control, and local-path repositories are also supported. Composer integrates with Fossil, Git, Mercurial, Perforce, and Subversion. It can be installed locally or as a system-wide executable on Windows, Linux, and macOS. The latest version requires PHP 7.2.5 or later; the 2.2.x LTS line supports PHP 5.3.2 and later. Its audit command checks installed packages for security advisories, abandoned packages, malware flags, and other dependency policies. Composer is free under the MIT license. Plugins and scripts can run with the user's permissions, so the project advises against running Composer as root with untrusted packages.