> nix-versions

Any version of 200_000+ nix packages at your fingerprints.

Works for everyone, at any level.

As a friendly CLI to explore available versions.

As a tools version manager and development shell.

As a flake generator for pinned-version packages.

Combine latest and dependable, stable versions.

Keep your compilers and tooling at known, stable releases that work with your current code.

And use the most recent version for other nixpkgs.

Plays well with existing tools.

Friendly with nix shell, direnv and advanced nix environments like devenv and devshell.

Usable as an input for any Flake and with fetchurl for non-flakes.

Powered by nix but requires no-wizardy™

All the advantages of Nix without much effort. Reproducibility, security checksums, sandboxed builds, caching, remote building.

Re-use your existing .ruby-version, .node-version project files.

Try it now.

As a command line utility

nix run github:vic/nix-versions -- 'emacs@~27 || ~29' --all

see command output

Name   Version  NixInstallable         VerBackend  
emacs  26.3     nixpkgs/e5b91d9#emacs  nixhub      
emacs  27.1     nixpkgs/54c1e44#emacs  nixhub      
emacs  27.2     nixpkgs/4c3c80d#emacs  nixhub      
emacs  28.1     nixpkgs/994df04#emacs  nixhub      
emacs  28.2     nixpkgs/09ec6a0#emacs  nixhub      
emacs  29.1     nixpkgs/160b762#emacs  nixhub      
emacs  29.2     nixpkgs/a3ed740#emacs  nixhub      
emacs  29.3     nixpkgs/a985888#emacs  nixhub      
emacs  29.4     nixpkgs/b58e19b#emacs  nixhub      
emacs  30.1     nixpkgs/0740f6f#emacs  nixhub

As a flake.nix generator

You can use our flake.zip endpoint as an input on your own flake.nix or devenv.yaml.
There's also flake.nix endpoint that outputs a text file.

nix develop 'https://nix-versions.alwaysdata.net/flake.zip/cowsay@latest/go@1.24.x' --output-lock-file /dev/null

see command output

🔨 Welcome to devshell
[[general commands]]
cowsay - Program which generates ASCII pictures of a cow with a message
go     - Go Programming language
menu   - prints this menu
[devshell]$ go version
go version go1.24.1 linux/amd64
[devshell]$

As a default.nix generator

We also provide default.{nix,zip} endpoints.
Compatible with fetchurl, fetchzip on non-flake environments.

nix-shell 'https://nix-versions.alwaysdata.net/default.zip/cowsay@latest' -A devShell --run "cowsay hello"