Conan vs Spack

Conan is a free, open-source package manager for C and C++ projects. It manages dependencies and binary packages through Conan recipes, with dependency resolution, lockfiles, workspaces, private registry authentication and offline installation. Binary configurations can vary by architecture, compiler and version, runtime, and C++ standard library. If a matching binary is unavailable, Conan can build from source on demand. It supports Windows, Linux, macOS, Android, iOS, embedded and bare-metal targets, as well as desktop, server and mobile platforms. Build integrations include CMake, MSBuild, Makefiles, Meson and SCons; other integrations include Docker, MinGW, WSL and JFrog Artifactory. Teams can share and reuse native binaries. Artifactory Community Edition offers self-hosted private package hosting, with a WebUI, authentication and permissions. Conan is released under the MIT License. The listed plan describes the package manager as free and open source; no price is stated for either plan.

Spack is a package manager for installing scientific software on supercomputers, Linux, macOS, and Windows. It is designed for large supercomputing centers that share software across clusters and varied architectures, and is available at free. Users can choose package versions, compiler choices, target architectures, and compile-time options, while controlling direct and transitive dependencies. Spack can build stacks that combine Python or R packages with C, C++, or Fortran libraries. Each distinct package and dependency configuration receives its own prefix, so different builds can coexist without a new installation disrupting an existing one. Software can be installed to a user-selected directory without administrator privileges. Spack primarily builds customized software from source and also supports binary installation through build caches. It supports lockfiles, environment management, and private registries. Package recipes are Python scripts, and the `spack create` command generates starter boilerplate. The project is distributed under either the MIT license or Apache License 2.0, at the user's option.