Opam is a source-based package manager for OCaml. It supports multiple simultaneous compiler installations, flexible package constraints, and a Git-friendly development workflow.
Publisher’s description
What is opam?
opam is an open-source version control program for Windows from OCaml, Inc.. It is written in OCaml.
Installation and requirements
Official installers exist for 64-bit as Portable. It runs without installation (portable). It needs Windows 10 1903 or newer.
Updates and version history
The current version is 2.6.1, released on October 7, 2026. 9 versions are listed since July 19, 2024, each with links to its own installer files. That is about 4.1 releases a year. The last update is less than a month old.
Popularity and file types
The source code on GitHub (ocaml/opam) has 1,383 stars. Similar programs include GitHub CLI, Git and Git Extensions.
Project description on GitHub: “opam is a source-based package manager. It supports multiple simultaneous compiler installations, flexible package constraints, and a Git-friendly development workflow.”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Portable: runs without installation
- Updated in the last two months
Cons
- No native ARM64 build
In short: opam is an open-source version control tool for 64-bit PCs. It is actively maintained.
Is opam safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
2548F0592ABFA728432C85EF6D08BF97C295C1859DDCA61876E33884336C130C· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Security practices (OpenSSF Scorecard)
Automated checks of the ocaml/opam repository on GitHub by the Open Source Security Foundation, last run on October 19, 2026.
- Actively maintained10
- Code review10
- No dangerous workflows10
- No binaries in the repository10
- Licence declared9
- Signed releases8
- Restricted token permissions0
- OpenSSF Best Practices badge0
- Fuzzing0
- Security policy0
- Pinned dependencies0
- Static code analysis0
The score rates how the project is developed and released, not whether the program is safe to install. scorecard.dev
Recent versions
All 9 versions ›9 versions over 2 years · about 4.1 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 2.6.1Latest | October 7, 2026 | — | 64-bit Portable |
| 2.6.0 | September 17, 2026 | — | 64-bit Portable |
| 2.5.2 | July 9, 2026 | — | 64-bit Portable |
| 2.5.0 | November 28, 2025 | — | 64-bit Portable |
| 2.4.1 | July 23, 2025 | — | 64-bit Portable |
| 2.4.0 | July 18, 2025 | — | 64-bit Portable |
| 2.3.0 | November 21, 2024 | — | 64-bit Portable |
| 2.2.1 | August 23, 2024 | — | 64-bit Portable |
Install from the command line
Silent install ›winget install --id OCaml.opam -escoop install main/opamProgram files (.exe): opam.exe
Related guide: How to use winget: install and update apps
Also for other systems
brew install opamInformation
- Publisher
- OCaml, Inc.
- Category
- Version control
- Licence
- LGPL-2.1-only WITH OCaml-LGPL-linking-exception
- Price
- Free
- Source code
- github.com/ocaml/opam
- Written in
- OCaml
- Requires
- Windows 11 / 10 (Windows 10 1903+)
- Architecture
- 64-bit
- Installer
- Portable
- Version
- 2.6.1
- Released
- October 7, 2026
- Added to the catalogue
- July 19, 2024
- Versions listed
- 9
- Updates / year
- 4.1
- GitHub stars
- 1,383
- GitHub forks
- 408
- Website
- opam.ocaml.org
- winget ID
- OCaml.opam
- Scoop package
- main/opam
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is opam free?
Yes. opam is open-source software under the LGPL-2.1-only WITH OCaml-LGPL-linking-exception licence.
Is opam safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install opam with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Which Windows versions does opam support?
The installer requires Windows 10 1903 or newer and is available for 64-bit.
Does opam run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of opam?
The versions page lists all 9 versions with links to their official installer files, back to July 19, 2024.
Can I use opam without administrator rights?
Yes, it is portable: unpack and run it.
What are alternatives to opam?
GitHub CLI, Git, Git Extensions, GitTools GitVersion and TortoiseGit. The alternatives page compares them.
