fnm vs rustup

fnm is a free Node.js version manager built in Rust for developers working from a command line or shell. It runs on macOS, Windows, and Linux, and is distributed as a single file through installation scripts, package managers, Cargo, or release binaries. It reads `.node-version` and `.nvmrc` files, so projects can specify a Node.js version. Shell setup can also enable automatic version switching when changing directories. The project provides setup instructions for Bash, Zsh, Fish, PowerShell, Windows Command Prompt, and Cmder. Its binary includes completions for Bash, Zsh, Fish, and PowerShell. On macOS and Linux, the installation script requires `curl` and `unzip`. The repository identifies the license as GPL-3.0 and invites pull requests, with issues available for project interaction. No paid plans are listed. The project page reports no published security advisories, while also noting that it has not set up a SECURITY.md file.

rustup installs Rust from its official release channels and manages the toolchains and supporting components developers use. It can switch among stable, beta, and nightly compilers, keep toolchains updated, and install specific versions or dated releases. For cross-compilation, add a target’s standard library with `rustup target add`; Android builds also require the Android NDK and usually a linker. rustup manages official channels, archived releases, alternate hosts, and local builds. It installs command proxies for tools including rustc, rustdoc, Cargo, rust-analyzer, Clippy, and Miri. Component availability varies by release and toolchain, especially for nightly. Installation uses a shell script on Unix and rustup-init.exe on Windows. Downloads use HTTPS, but download signatures are not yet validated. rustup is free and open source, with a free plan. Its listed supported platforms are Linux, macOS, and Windows; the installer also runs on FreeBSD, NetBSD, Solaris, and illumos.