mise vs asdf: Which Polyglot Version Manager for CI?
mise (formerly rtx) is a faster, Rust-based take on asdf that stays compatible with .tool-versions while adding env and task management.
asdf is the established multi-language version manager driven by plugins and .tool-versions. mise is a Rust-based alternative that reads the same files, runs much faster, and adds environment-variable and task-runner features.
| mise | asdf | |
|---|---|---|
| Implementation | Rust | Shell + plugins |
| Speed | Faster | Slower (shims) |
| Config compatibility | Reads .tool-versions | .tool-versions |
| Extra features | Env vars, tasks | Versions only |
| Plugin ecosystem | asdf-compatible + native | Large, mature |
In CI
mise is faster than asdf and avoids shim overhead, which trims toolchain setup time, and it can reuse asdf plugins and .tool-versions so migration is low-friction. It also bundles env-var and task features that can replace extra scripts. asdf remains the mature, widely documented choice with the largest plugin catalog. Both pin every language in one file for reproducible CI.
Pin and cache
Commit .tool-versions so CI installs the exact local versions, and cache the installed toolchains. The install runs on CI runners; faster managed runners shorten cold multi-language setup.
The verdict
Want faster setup, env/task features, and asdf compatibility: mise. Want the mature, maximally documented standard: asdf. Both use .tool-versions, so trying mise is low-risk - commit the pin file for reproducible CI.