Mise — Dev Environment Manager for Any Language

Replaces These Tools

Project Configuration

# .mise.toml — commit this to your repo
[tools]
node = "22"
python = "3.12"
go = "1.22"

[env]
DATABASE_URL = "postgres://localhost/mydb"

[tasks]
dev = "npm run dev"
test = "pytest"
lint = "ruff check ."

Auto-Switching

When you cd into a project, mise automatically activates the right versions:

cd ~/project-a  # Node 20, Python 3.11
cd ~/project-b  # Node 22, Python 3.12
# No manual switching needed

Task Runner

Built-in task runner (replaces Makefile, npm scripts):

mise run dev      # Run dev server
mise run test     # Run tests
mise run lint     # Run linter
mise run deploy   # Deploy

Environment Variables

[env]
AWS_PROFILE = "production"
LOG_LEVEL = "debug"

[env.production]
LOG_LEVEL = "error"

Performance

Written in Rust — instant version switching:

mise activate: <1ms
nvm use: 200-500ms
pyenv: 100-300ms

Key Stats

• 12,000+ GitHub stars
• 100+ supported tools
• Written in Rust (instant switching)
• Project-level .mise.toml
• Built-in task runner and env vars

FAQ

Q: What is Mise? A: Mise is a single CLI tool that manages versions of Node, Python, Go, Rust, and 100+ dev tools, replacing nvm, pyenv, rbenv, and dozens of other version managers.

Q: Is Mise free? A: Yes, fully open-source under MIT license.

Q: Is Mise compatible with .nvmrc and .python-version? A: Yes, Mise reads existing .nvmrc, .node-version, .python-version, and .tool-versions files.