ZeroSSL is a free SSL certificate provider that offers easy certificate creation, management, and renewal with automation tools.
Best Lego Alternatives ranked by AI · updated Aug 2026
Lego is a Go-based ACME client library and command-line tool for obtaining and renewing TLS certificates. It is used by operators and software projects that need portable binaries, DNS challenge support, or programmatic certificate workflows.
Top 6 Lego alternatives
acme.sh is a lightweight, shell-based ACME client for issuing and renewing TLS certificates from compatible certificate authorities. It targets developers and administrators...
Pros
- Runs with minimal dependencies on many Unix-like systems
- Supports numerous DNS APIs for automated wildcard validation
- Works with multiple ACME certificate authorities rather than only one
Cons
- Less approachable than SSL For Free for nontechnical users
- Shell-script configuration can be difficult to debug
- Does not provide a polished certificate-management dashboard
Free and open source
Certify The Web is a Windows application that automates ACME certificate issuance, renewal, and deployment for IIS and other services. It is...
Pros
- Provides a richer Windows GUI than most command-line ACME clients
- Automates deployment to IIS and several cloud or hosting targets
- Supports multiple ACME authorities and certificate renewal workflows
Cons
- Windows-focused, unlike cross-platform clients such as Certbot
- Commercial use requires a paid license for many deployments
- More resource-intensive than lightweight command-line clients
Free for personal use; commercial licenses from $49/year
4
Certbot
Electronic Frontier Foundation
Certbot is a free, open-source ACME client that obtains and renews TLS certificates, primarily from Let's Encrypt. It is designed for administrators...
Pros
- Automates issuance, installation, and renewal on Apache and Nginx
- More flexible server integration than SSL For Free's web dashboard
- Backed by extensive documentation and Linux distribution packages
Cons
- Command-line configuration is more technical than SSL For Free
- Primarily optimized around Let's Encrypt workflows
- Can require manual plugin or web-server troubleshooting
Free and open source
5
win-acme
win-acme contributors
win-acme is a free, open-source ACME client for Windows that obtains and renews certificates from Let's Encrypt and other compatible authorities. It...
Pros
- Strongest free Windows alternative for IIS certificate automation
- Supports unattended operation and scheduled renewal tasks
- Works well from scripts and administrative workflows
Cons
- Less polished graphical management than Certify The Web
- Advanced configuration is more command-line oriented
- Fewer built-in deployment integrations than Certify The Web
6
Posh-ACME
Ryan Bolger
Posh-ACME is an open-source PowerShell module for managing ACME accounts, certificates, challenges, and renewals. It is aimed at Windows administrators who want...
Pros
- Provides deep PowerShell integration for Windows administration
- Supports many DNS challenge providers through plugins
- Easy to incorporate into repeatable deployment scripts
Cons
- Requires PowerShell knowledge and scripting effort
- Does not provide Certify The Web's graphical dashboard
- Deployment to applications often needs custom scripting
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