Cargo

Cargo is the package manager and build tool for Rust software. It is the natural fit for developers building Rust packages who want dependencies, builds, tests, and releases in one command-line workflow. It is free and broad in scope, though features marked unstable require a nightly toolchain.

Overview

Cargo handles much of a Rust package’s lifecycle: it fetches dependencies, invokes rustc or another build tool with the needed parameters, and provides commands to compile, check, document, test, run, package, install, and publish. The cargo new command starts a binary package by default; use --lib to start a library. That breadth makes Cargo a practical everyday tool for Rust development, not merely a dependency downloader.

Dependencies can come from crates.io, alternate registries, Git repositories, or local paths. Lockfiles help keep builds repeatable, and workspaces let related packages share a lockfile and output directory. The clear limitation is language scope: Cargo is designed for Rust packages, not projects in other ecosystems.

Key features

Dependencies and registries

Crates.io is the default registry, while alternate registries can be configured in .cargo/config.toml with Git or sparse protocols. Cargo supports private-registry authentication, useful for teams consuming internal packages. Credential providers can store tokens in Windows Credential Manager, macOS Keychain, or libsecret; the cargo:token provider instead stores tokens as unencrypted text, so the choice of provider matters for credential security.

Workspaces and offline builds

Workspaces manage multiple packages together, sharing a Cargo.lock file and output directory. This helps keep related crates coordinated without treating each package as an isolated project. With net.offline enabled or the --offline option, Cargo avoids network access and attempts to work from cached data. That is useful for disconnected or restricted environments, but it depends on the required data already being cached.

Features, publishing, and extensibility

Package features enable conditional compilation and optional dependencies, selectable with flags such as --features. Cargo can create distributable packages and upload them to crates.io. It can also mark a published version as yanked so new dependency resolution avoids it while existing lockfiles continue to work. New subcommands extend Cargo without changing Cargo itself. Some documented features remain unstable and require a nightly toolchain with -Z flags, which makes them a poor foundation for workflows that need stable-toolchain compatibility.

Pricing

Cargo is free: its plan costs free. The free plan is the complete Rust package manager and build tool, with no trial period or paid tier to weigh against it. That makes it an accessible choice for individual developers and teams alike; the meaningful trade-offs are technical, not subscription limits.

Platforms

Cargo is included with the Rust toolchain installed through rustup, with installation instructions for Windows, macOS, Linux, and other Unix-like systems. It is used through a command-line interface, so it suits developers comfortable working in a terminal rather than those looking for a graphical package-management app.

Who it's for

Cargo is for developers building Rust packages, from standalone binaries and libraries to multi-package workspaces. It is particularly useful when a project needs dependency resolution across registries, Git, or local paths, repeatable builds, and integrated test and publishing commands. It is not the right choice as a general package manager for a mixed-language project.

Pros and cons

• Pros: Covers dependency management, builds, checks, tests, packaging, and publishing in one Rust-focused tool, reducing the need to piece together separate package-lifecycle commands.
• Pros: Workspaces, lockfiles, private registry authentication, and offline mode support coordinated and repeatable development across different environments.
• Pros: Free and included with the Rust toolchain, with support across Windows, macOS, Linux, and other Unix-like systems.
• Cons: Its Rust focus makes it unsuitable as a cross-language package manager.
• Cons: Offline operation depends on cached data, and the cargo:token credential provider stores tokens unencrypted.
• Cons: Unstable features require nightly Rust and -Z flags, limiting their suitability for stable-toolchain workflows.

Alternatives

For JavaScript package management, consider npm, which offers a free plan for public package authors with unlimited public packages, public publishing, and registry access. Python developers can choose uv instead, a free open-source Python package manager. Yarn is another free open-source package manager with no paid plans or usage limits stated. For build workflows, Gradle is a free open-source build system; pip is a free option for Python package management. pnpm is another free package manager. Java projects can use Apache Maven, a free option that requires JDK 8+ for Maven 3.10. PHP developers can consider Composer, a free dependency manager under the MIT license. Browse the Package Managers category for more choices.

Verdict

Choose Cargo if you build Rust software and want a free tool that carries packages from dependency resolution through testing and publishing, with workspaces and offline operation in the same workflow. Look elsewhere if you need a manager for other languages, or if your workflow depends on unstable features but must remain on stable Rust.