acme.sh vs ZeroSSL
A detailed comparison to help you choose between acme.sh and ZeroSSL.
acme.sh Free ACME client for automated SSL/TLS certificate management | ZeroSSL Free SSL alternative to Let's Encrypt | |
|---|---|---|
| Overview | ||
| Rating | 3.9 (71 reviews)✓ | 3.8 (46 reviews) |
| Pricing model | free | freemium |
| Starting price | Free | Free tier available |
| Best for | DevOps engineers and sysadmins managing Let's Encrypt certificates across multiple domains and DNS providers in resource-constrained or Unix-native environments. | Developers who want a Let's Encrypt alternative for CA diversification or need OV/EV certificates |
| Tags | ||
| Tags | free tieropen source | free tierapi access |
| Visit acme.sh → | Visit ZeroSSL → | |
acme.sh
Pros
- + Deploy to 200+ DNS and hosting providers with minimal configuration
- + Renew certificates automatically without manual intervention
- + Run without root access or external dependencies
- + Support wildcard and multi-domain SAN certificates
- + Generate standalone certificates for non-web services
Cons
- - Shell-based implementation may be slower than compiled alternatives on high-volume deployments
- - Requires manual DNS API credential setup for DNS-01 validation
- - Limited GUI or web interface options for certificate management
ZeroSSL
Pros
- + Alternative CA to Let's Encrypt — diversification
- + REST API for certificate management
- + Paid OV/EV available
Cons
- - Free tier limited to 3 certificates
- - Less established than Let's Encrypt
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