# Install cafeobj with Homebrew, apt

New generation algebraic specification and programming language. Version 1.6.2 via Homebrew; verified 2026-07-29. Also installable with ubuntu: sudo apt install cafeobj.

## Install

```sh
sudo av install brew:cafeobj
```

Additional install commands:

### macOS

- Homebrew (100%):

```sh
brew install cafeobj
```

  Evidence: local Homebrew formula metadata

### Linux

- Ubuntu apt (92%):

```sh
sudo apt install cafeobj
```

  Evidence: Ubuntu 24.04 LTS package indexes: cafeobj from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz

## Package facts

- **Package key:** brew:cafeobj
- **Package manager:** Homebrew
- **Version:** 1.6.2
- **Source summary:** New generation algebraic specification and programming language
- **Homepage:** <https://cafeobj.org/>
- **Repository:** <https://github.com/CafeOBJ/cafeobj>
- **Last updated:** 2026-07-29T08:54:41+01:00
- **Generated:** 2026-08-03T19:37:03+00:00

## Executables

- cafeobj (alias)

## Install behavior

- Bottle: not available

## Freshness

- Page generated: 2026-08-03
- Package-manager version: 1.6.2
## Project history and usage

CafeOBJ is an algebraic specification and programming language used in formal-methods work, theorem-style verification, and executable specifications.

### Project history

The official interpreter README identifies CafeOBJ as a new-generation algebraic specification and programming language and as a direct successor of OBJ. It inherits OBJ features such as mixfix syntax, subtyping, module composition, parameterized modules, views, and module expressions, while adding rewriting logic, hidden algebra, and combinations of those paradigms.

The open interpreter source is maintained in Common Lisp and can be built with Allegro CL, SBCL, or CLISP. The GitHub repository was created in 2017, while the README for version 1.6.0 is dated 2020-01-20 and the repository carries later 1.6.x tags.

### Adoption history

CafeOBJ's adoption is specialized: it lives in the formal specification and verification community rather than mainstream application development. Packaging in Homebrew and Ubuntu makes it easier for researchers, students, and toolchain curators to install the interpreter without manually building a Lisp system.

### How it is used

Users write formal specifications, load them into the CafeOBJ processor, reduce terms, inspect modules, and construct proof scores. The official introductory material walks beginners from describing specifications to verification using simple natural-number examples.

### Why package nerds care

CafeOBJ matters to package-history nerds because it is one of the long-tail formal-methods languages that package managers preserve alongside mainstream compilers. Its Homebrew formula keeps a Common Lisp-based research language installable on modern developer machines.

### Timeline

- 2017: Public CafeOBJ interpreter repository created on GitHub.
- 2020: README marks CafeOBJ interpreter version 1.6.0 dated 2020-01-20.
- 2020s: 1.6.x tags continue the interpreter line.
- Present: Homebrew and Ubuntu package the interpreter for easier installation.

### Related projects

- OBJ is the direct predecessor named by the official CafeOBJ README.
- CafeOBJ sits near other algebraic specification and rewriting-logic tools, but its official documentation frames its own lineage through OBJ, rewriting logic, hidden algebra, and proof scores.

### Sources

- <https://api.github.com/repos/CafeOBJ/cafeobj>
- <https://api.github.com/repos/CafeOBJ/cafeobj/tags>
- <https://cafeobj.org/files/manual.pdf>
- <https://cafeobj.org/intro/en/index.html>
- <https://github.com/CafeOBJ/cafeobj#readme>


## Security Notes

generalized runtime or code generation signal.

- **Geiger risk:** yellow / medium
- generalized runtime or code generation signal

## Other Package-Manager Records

- Ubuntu apt - cafeobj - 1.6.0-2build1: normalized package name match | Ubuntu 24.04 LTS package indexes: cafeobj from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | new generation algebraic specification and programming language | http://cafeobj.org/
- Ubuntu apt - cafeobj-mode - 1.6.0-2build1: normalized package name match | Ubuntu 24.04 LTS package indexes: cafeobj-mode from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | Emacs major mode for editing CafeOBJ source code | http://cafeobj.org/


## Combined YAML source

View the package source record on GitHub. [combined/cafeobj.yml](https://github.com/mxcl/pkgdb/blob/main/combined/cafeobj.yml)


## Sources

- pkg.so package database
- Geiger risk classifier
- curated package history
- pkgdb category and tag curation
- external package-manager database matches
- cross-ecosystem install command graph