FREEDOM251

Freedom251 › Package Managers

Rattler

Free plan APILinuxMacSelf-hostedWebWindows

Visit Rattler Alternatives

Rattler's own site

What Rattler is

Rattler is a free Rust library for building software that works with the Conda ecosystem without requiring Python. It can solve Conda environments, download and install packages, and run commands inside those environments. The project provides a Rust API plus bindings for other languages. Python developers can use `py-rattler` through pip or conda, while `@conda-org/rattler` is a WebAssembly package for browsers and Node.js, installable with npm. Rattler supports .conda and .tar.bz2 packages, dependency resolution, lockfiles, and authentication for private registries. Its components cover package archives, repository metadata, environment solving, shell activation, lockfiles, networking, and related tasks. The `rattler_sigstore` crate discovers, downloads, and verifies Sigstore attestations for Conda packages. Examples cover Windows, Linux, and macOS, including JupyterLab. The repository uses a BSD-3-Clause license and directs questions and contributions to Discord.

Who it suits

Rattler suits developers creating tools or libraries that need Conda functionality from Rust or other languages. It also fits projects targeting Python, browsers, Node.js, Windows, macOS, or Linux.

What it does well

  • Works with Conda without requiring Python
  • Supports dependency resolution and lockfiles
  • Python and WebAssembly language bindings
  • Private registry authentication included
  • Verifies Sigstore package attestations

What to know first

  • No free trial is listed
  • Requires development work to integrate
  • Package formats are limited to .conda and .tar.bz2

Verdict

Rattler provides broad Conda environment and package capabilities through Rust, with bindings for Python and JavaScript targets. Its lockfiles, registry authentication, and package-attestation support are useful for developers building Conda-aware software.

Facts from Rattler's own pages

Browser use
The README names mambajs as a user of Rattler for solving and installing packages from the emscripten-forge channel in a browser. · github.com, 11 Oct 2026
Community support
The README directs contributors with questions or requests to the project's Discord server. · github.com, 11 Oct 2026
Components
The project includes crates for package archives, repository metadata, environment solving, shell activation, lockfiles, networking, and other Conda-related tasks. · github.com, 11 Oct 2026
Dependency resolution
Yes · github.com, 21 Sept 2026
Environment workflows
Rattler can solve environments, install packages, and run commands in Conda environments. · github.com, 11 Oct 2026
Free plan
Yes · github.com, 21 Sept 2026
Installation
The README documents installing py-rattler with pip or conda and installing @conda-org/rattler with npm. · github.com, 11 Oct 2026
Integrations
The project says Rattler is actively used by Pixi, rattler-build, and the prefix.dev backend. · github.com, 11 Oct 2026
Intended users
Rattler is intended for developers building tools and libraries that need to interact with the Conda ecosystem from Rust or other languages. · github.com, 11 Oct 2026
JavaScript bindings
The `@conda-org/rattler` package is compiled to WebAssembly and can be used in browsers or Node.js. · github.com, 11 Oct 2026
Language bindings
Rattler offers Python bindings and JavaScript bindings compiled to WebAssembly for browsers and Node.js. · github.com, 11 Oct 2026
License
The repository lists a BSD-3-Clause license. · github.com, 11 Oct 2026
Lockfile support
Yes · github.com, 21 Sept 2026
Operating systems
The README gives example commands for Windows, Linux, and macOS. · github.com, 11 Oct 2026
Package formats
.conda,.tar.bz2 · github.com, 21 Sept 2026
Package verification
The `rattler_sigstore` crate discovers, fetches, and verifies Sigstore attestations of Conda packages. · github.com, 11 Oct 2026
Package workflows
Rattler can solve environments, download and install packages, and run programs in Conda environments. · github.com, 11 Oct 2026
Private registry auth
Yes · github.com, 21 Sept 2026
Product
Rattler is a Rust library that provides functionality for working with the Conda ecosystem without requiring Python. · github.com, 11 Oct 2026
Purpose
Its stated goal is to let applications work with Conda without depending on Python. · github.com, 11 Oct 2026
Python bindings
Python bindings are available as `py-rattler` through pip or conda, and the README says they are designed for asyncio. · github.com, 11 Oct 2026
Rust API
The project describes Rattler as providing a clean API and language bindings for use in non-Rust projects. · github.com, 11 Oct 2026
Security reporting
The security policy asks users to report vulnerabilities through GitHub Security Advisories and says the security team will provide progress updates after its initial response. · github.com, 11 Oct 2026
Support and community
The README invites contributors and directs questions, requests, or informal discussion to its Discord server. · github.com, 11 Oct 2026

Where Rattler stands on Freedom251

Look at these too