Flox vs GHCup

Flox gives developers a way to define reproducible software environments, including project packages, variables, and shell hooks, with configuration managed as code. It presents these environments as working across macOS, Linux, and WSL2. Its Nixpkgs-powered catalog contains more than 190,000 packages. FloxHub supports syncing and sharing environments, with package lists, earlier versions, and change logs available for review. GitHub Actions can install Flox and activate environments in CI workflows, while a VS Code extension supports package management, activation, and running services; the extension is also compatible with Cursor. Flox Skills are described as helping Claude Code, Codex, and skills.sh agents create environments, services, and builds and onboard repositories. Flox says environments include signed, hash-pinned software bills of materials and build provenance. The free Personal plan includes three private FloxHub environments and five private packages. Team costs $20/user/mo; Enterprise pricing is custom.

GHCup is a free, open-source installer and version manager for the Haskell toolchain. It installs and manages GHC, cabal-install, Haskell Language Server (HLS), and Stack versions; Stack can also be configured to use GHC versions managed by GHCup. Listed functionality includes a terminal user interface and GHC cross-compilation. Installation guidance covers terminal commands for Linux, macOS, FreeBSD, and WSL2, alongside PowerShell instructions for Windows. The project describes Windows support as being in an early stage and uses a shim wrapper because Windows does not properly support symbolic links. On macOS, GHCup may prompt for command line tools; Windows setup includes msys2. The installer should be run as a non-root user on Unix-like systems and a non-admin user on Windows. GHCup relies on precompiled binaries, so compatibility can depend on the distribution and libraries such as libtinfo. WSL1 and macOS versions earlier than 10.13 are unsupported. Some ARM binaries are experimental: Stack and HLS on Linux ARM, and HLS bindists on macOS aarch64. Configuration can be stored in ~/.ghcup/config.yaml, with command-line options taking precedence.