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win-acme

ACME client for Windows that obtains and renews TLS certificates from Let's Encrypt and other ACME services and installs them in IIS and other stores.

win-acme runs on Windows and requests certificates from Let’s Encrypt and other ACME services for the sites on the machine. The getting started guide asks for the program to be unzipped to a folder that stays in place, because the scheduled task runs from it. The homepage describes creating and installing certificates on a local IIS server.

A scheduled task renews the certificates. The automatic renewal page says the task runs every day and checks two conditions before it renews.

Worth knowing

The README says ZeroSSL officially maintains the repository. A fork named simple-acme describes itself as a clone of this project.

The system requirements page limits the current build to recent Windows Server editions and lists older builds for older Windows releases.

Identity

Status
Active
Maintainer
ZeroSSL4
Maintained by
Company4
First release
20155

Rendering and deploy

Runs as
Scheduled7
Install with
zip download, unpacked and run as wacs.exe4

Releases

Current major version
29
Last release
2024-05-259

Adoption

GitHub stars
5,8322
Contributors
9310

Why these figures do not compare

Sources

  1. 2026-10-31: links
    www.win-acme.com/
  2. 2026-10-31: links, Written in, License, GitHub stars
    api.github.com/repos/win-acme/win-acme
  3. 2026-10-31: links
    www.win-acme.com/manual/getting-started
  4. 2026-10-31: Maintainer, Maintained by, Categories, Runtime, Install with
    github.com/win-acme/win-acme/blob/master/README.md
  5. 2026-10-31: First release
    github.com/win-acme/win-acme/releases/tag/v0.6
  6. 2026-10-31: Minimum runtime
    github.com/win-acme/win-acme/blob/v2.2.9.1701/src/main/wacs.csproj
  7. 2026-10-31: Runs as
    www.win-acme.com/manual/automatic-renewal
  8. 2026-10-31: License model
    github.com/win-acme/win-acme/blob/master/LICENSE
  9. 2026-10-31: Current major version, Last release
    github.com/win-acme/win-acme/releases/tag/v2.2.9.1701
  10. 2026-10-31: Contributors
    api.github.com/repos/win-acme/win-acme/contributors?per_page=1

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