asdf vs mise: Polyglot Version Managers
asdf is the established plugin-based manager for many language runtimes; mise is a faster Rust rewrite that is largely asdf-compatible.
asdf manages versions of Node, Python, Ruby, and dozens of other tools through a shared plugin system and a .tool-versions file. mise (formerly rtx) keeps that model but is written in Rust, runs noticeably faster, avoids per-shell shim overhead, and adds environment management and task running. Both replace single-language managers with one tool; mise trades asdf maturity for speed.
| asdf | mise | |
|---|---|---|
| Language | Shell + plugins | Rust |
| Speed | Slower (shims) | Fast |
| Config | .tool-versions | .tool-versions / mise.toml |
| Extras | Version mgmt | Env + tasks too |
| Best for | Mature plugin base | Speed, modern features |
In CI
asdf shims add overhead on every command, which adds up in CI; mise resolves versions faster and reads the same .tool-versions, so migration is low effort. Both install runtimes per project so jobs use the exact pinned versions. mise also bundles task running, reducing extra tooling.
Speed it up
Cache the installed-tools directory keyed on .tool-versions so runtimes are warm. Both run on CI runners; faster managed runners shorten the runtime install and setup steps.
The verdict
Wanting the most mature plugin ecosystem and an established tool: asdf. Wanting faster resolution, no shim overhead, and built-in env and task features: mise. mise reads asdf config, so trying it on an existing repo is low risk.