Cargo vs Swift Package Manager

Cargo is the free package manager and build tool for Rust, used through a command-line interface. It downloads dependencies, builds packages, and supports repeatable builds with lockfiles. Developers can compile, check, document, test, run, package, install, and publish Rust projects. The `cargo new` command creates a package, defaulting to a binary; adding `--lib` creates a library. Cargo uses crates.io by default and also handles alternate registries, Git dependencies, and local paths. Workspaces allow multiple packages to share a lockfile and output directory. Package features can enable conditional compilation and optional dependencies. In offline mode, Cargo avoids network access and attempts to use cached data. It supports authentication options for registries and new subcommands without modifying Cargo itself. Rustup installs Cargo with the stable Rust release, and installation instructions cover Windows, macOS, Linux, and other Unix-like systems. Cargo is open source under the MIT and Apache License, Version 2.0. Some documented capabilities remain unstable and require a nightly toolchain and `-Z` flags.

Swift Package Manager is a free tool for sharing Swift code as packages, using dependencies, and building, testing, documenting, and running code. A package uses a Package.swift manifest alongside source files, resources, and other assets. Packages can provide library, executable, or plugin products, and can depend on other Swift packages, system libraries, or binary dependencies. Commands such as swift build and swift test support builds and tests; package dependencies are resolved automatically when swift build or swift run is invoked. Plugins can add build capabilities or commands, including generating source files and resources, and run in a sandbox that blocks network and most file-system access unless the user approves additional permissions. Swift Package Manager works from the command line and is integrated into Xcode. It supports macOS, Linux distributions including Ubuntu, Debian, Fedora, and Amazon Linux, as well as Windows; tools on macOS can build for Apple platforms including iOS. Swift 6.4 made Swift Build the default build system in Swift Package Manager.