devenv vs vfox
devenv
devenv.shvfox
vfox.devSide by side
| Figure | devenv | vfox |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| Plans published | 1 | 1 |
| Spec score · Development Environment Managers | 8.7 (#3) | 8.0 (#16) |
| Spec score · Development Environment Management Tools | 8.6 (#3) | 8.0 (#11) |
| Configuration | A project can declare packages, languages, services, tasks, secrets, and tooling in its environment configuration. | It saves tool version information in a .vfox.toml file that can be shared across projects and teams. |
| Integrations | The documentation includes integrations such as direnv, SecretSpec, GitHub CI, and an MCP server for AI assistants. | The documentation lists community plugins for tools including Bun, Clang, CMake, Crystal, Dart, Deno, and .NET. |
| Purpose | devenv lets teams declare development environments so developers and CI can use the same reproducible setup. | vfox is a cross-platform version manager for installing and switching between development runtimes and SDKs. |
| Security | Projects must be explicitly trusted before auto-activation, which the documentation describes as protection against untrusted projects modifying the shell. | The multi-user guide recommends group permissions for a shared SDK directory and warns that broad 777 permissions expose it to unauthorized users. |
Plans
In their own words
devenv
devenv uses Nix to define development environments for teams and CI. A project configuration can specify packages, languages, services, tasks, secrets, variables, files, and shell scripts. The project lists 58 supported languages and 42 preconfigured services, including PostgreSQL, Redis, MySQL, RabbitMQ, and Elasticsearch. Processes can be supervised with dependencies and restarts, while tasks can run in parallel and integrate with shells or commits. SecretSpec can read declared secrets from sources such as Keychain, 1Password, LastPass, dotenv, and environment variables. devenv can build OCI containers and run integration tests with its processes active; documentation also describes GitHub Actions use for checks, builds, and tests. It requires Nix and works on Linux, macOS, and WSL. As of devenv 2.4, the project no longer builds, tests, or releases it for Intel Macs. Projects must be explicitly trusted before automatic activation. The software is free and MIT licensed, with GitHub and Discord linked for help and community. Cached shell startup is listed as under 100 ms after the first build; devenv Cloud is in private beta.
vfox
vfox is a free, Apache 2.0-licensed version manager for development runtimes and SDKs on Linux, macOS and Windows. It supports project, session and global version scopes, and can switch to a project's version when entering its directory. Teams can record tool versions in `.vfox.toml` and share that configuration. A plugin system adds support for tools and environments; its public registry includes community plugins for tools such as Bun, Clang, CMake, Crystal, Dart, Deno and .NET. Plugins that support legacy version files can read formats such as `.nvmrc`, and this capability is enabled by default. Documented shells include PowerShell, Git Bash, Bash, ZSH, Fish, CMD, Clink, Cmder and Nushell. CMD is limited to global scope and is not recommended. For Docker, CI/CD and other non-interactive shells, the documentation recommends `vfox exec` instead of shell activation hooks. The configuration guide lists support for HTTP(S) proxies only. For shared SDK storage on Linux and macOS, the guide recommends group permissions and warns against world-writable access.