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Simple-acme is a cross-platform ACME client designed to automate the acquisition and renewal of SSL/TLS certificates from Let’s Encrypt and other ACME-compliant certificate authorities. Forked from the Windows-oriented win-acme project, the tool streamlines certificate management for web servers, reverse proxies, mail servers, and any service that requires publicly trusted X.509 certificates. By implementing the ACME protocol, simple-acme can validate domain ownership through HTTP-01, DNS-01, or TLS-ALPN-01 challenges, obtain certificates, and schedule unattended renewals before expiration, eliminating manual workflows and reducing the risk of service downtime caused by invalid certificates. The software stores configuration in portable JSON files, supports unattended operation via command-line arguments, and integrates with popular web servers such as Apache, Nginx, and IIS, as well as with automation pipelines and containerized environments. Version 2.3.6.2257 is the current stable release among five published versions, each refining compatibility across Windows, Linux, and macOS while maintaining a small footprint and no external runtime dependencies beyond .NET 6. Administrators typically deploy simple-acme on edge nodes, load balancers, and CI/CD workers to secure public-facing endpoints, internal micro-services, and wildcard domains without exposing private keys or relying on proprietary certificate vendors. Logging, revocation, and post-renewal hooks enable further customization, allowing certificates to be copied to remote hosts, loaded into hardware security modules, or distributed through secret-management systems. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e. g. winget), always delivering the latest version, and supporting batch installation of multiple applications.
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