Rattler
Rattler: An open-source Conda toolkit for embedding solving and environment management in applications. Ranked #17 of 27 in Python Package Managers by our editors (7.1/10); pricing: Free plan; best for embedding Conda solving in applications.
At a glance
- Editor score7.1 / 10
- PricingFree plan
- Best forEmbedding Conda solving in applications
- Free planYes
- Paid fromFree
- Lockfile supportYes
- Facts checked21 Sep 2026
Where it wins
- Conda solving, downloads, extraction, and environment installation
- Python, JavaScript, and WebAssembly bindings
- Lockfiles, channel indexing, and virtual package detection
Where it doesn't
- Designed as libraries and crates, not a standalone end-user package manager
- Narrower scope for users seeking a complete package manager
- No AI features
Our verdict on Rattler
Rattler is an open-source collection of Rust crates for interacting with the Conda ecosystem without depending on Python. It is designed for developers building applications and tools that need Conda package downloading, dependency solving, environment installation, shell activation, package indexing, networking, virtual package detection, or lockfile handling. Python bindings expose solving, installation, and environment execution, while JavaScript and WebAssembly bindings extend the available application environments.
Its strongest case is depth around Conda environment operations. Rattler supports package downloading, extraction, and creation; dependency solving; environment installation and updates; shell activation; command execution; channel indexing; virtual package detection; and lockfile creation and parsing. That combination makes it suitable when an application needs to embed Conda workflows rather than delegate them to a separate Python-based package manager. Cross-platform support covers Windows, macOS, and Linux, with an API platform option for application integration.
Rattler also fits a broader Prefix.dev ecosystem through Pixi, Rattler-Build, and the Prefix.dev backend. It is free and open source, with no paid plan structure involved in its positioning. The main tradeoff is product shape: Rattler is documented as a library and set of crates, and its Python bindings are distributed as py-rattler. Teams seeking a ready-to-use, standalone end-user package manager may prefer a tool built around direct command-line workflows instead. Rattler is the better choice for embedding Conda solving, installation, and execution into software, especially when Rust or its language bindings fit the application architecture.
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Rattler pricing
Rattler fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Lockfile support | Yes |
| Environment management | Yes |
| Package publishing | Not verified |
| Private registry | Not verified |
| Dependency groups | Not verified |
| Supported platforms | Cross-platform |
| Deployment | Desktop |
| Platforms | Windows, macOS, Linux |
| Support | Community, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 3 integrations: Pixi, Rattler-Build, Prefix.dev backend |
| Pricing | Free plan |
| Website | prefix.dev |
| Facts checked | 21 Sep 2026 |
Rattler integrations
Rattler lists 3 integrations on its own site.
- Pixi
- Rattler-Build
- Prefix.dev backend
Alternatives to Rattler
- uvAn open-source toolkit for managing modern Python projects from dependencies to publishing.9.3
- PoetryA focused open-source workflow for resolving, isolating, building, and publishing Python projects.9.1
- PDMA standards-focused manager for reproducible environments, workspaces, and private indexes.9.0
See all Rattler alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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