Let's Encrypt vs ZeroSSL
Side-by-side comparison of features, pricing, ratings, and alternatives.
Let's Encrypt is a free, automated certificate authority that issues domain-validated TLS certificates. It provides a simple and secure way to obtain SSL/TLS certificates, which are essential for encrypting online communications and protecting sensitive data.
ZeroSSL is a certificate authority that issues X.509 certificates using the ACME protocol, offering both free domain-validated certificates and paid options with extended validation and wildcard support. It provides a web dashboard for manual issuance and an API for automated workflows. The service integrates with popular automation tools, supports RSA and ECC keys, and offers enterprise-grade features such as dedicated support and SLA-backed issuance for large-scale deployments.
- Free SSL/TLS certificates
- Automated issuance process
- Easy to integrate with popular web servers and platforms
- Meets industry standards for security and encryption
- Free tier provides fully functional DV certificates.
- Supports ACME standard, compatible with existing tooling.
- Wildcard and extended-validation options available.
- Simple web dashboard for manual issuance.
- Limited to domain-validated certificates
- No support for organization-validated or extended-validation certificates
- No phone or email support available
- Limited rate limits on the free tier.
- Paid plans require subscription and may be pricey for small sites.
- No built-in CDN or hosting services.
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The Verdict
AI-generated from listing dataBoth provide free domain‑validated certificates, but Let’s Encrypt is the pure‑free, no‑support option, while ZeroSSL adds paid plans, a dashboard, and paid support.
Key differences
- •ZeroSSL offers a web dashboard and API for manual or CI/CD issuance; Let’s Encrypt relies on ACME automation only.
- •ZeroSSL provides paid plans with 1‑year wildcard certificates and higher rate limits; Let’s Encrypt only offers free DV certificates.
- •ZeroSSL includes paid enterprise support and SLA; Let’s Encrypt has no phone or email support.
- •Both support ACME, but ZeroSSL also supports both RSA and ECC keys explicitly.
- •ZeroSSL’s free certificates are 90‑day like Let’s Encrypt, but ZeroSSL’s paid tier extends validity to 1 year.
Pricing & value
Let’s Encrypt is completely free for all usage; ZeroSSL’s advanced features require paid subscriptions.
Uptime & reliability
Neither product’s uptime or reliability is specified in the provided facts.
Performance
No performance metrics (latency, issuance speed) are given for either service.
Developer experience
Both support ACME; ZeroSSL adds a web UI and API, but Let’s Encrypt’s automation is standard.
Regions & compliance
Geographic coverage or compliance certifications are not mentioned for either.
Support
ZeroSSL offers paid enterprise support and SLA; Let’s Encrypt provides no phone or email support.
Lock‑in
Both are standard CAs; switching to another CA is possible for each.
Choose Let's Encrypt if…
Ideal for developers or sites that need free DV certificates and can handle self‑service without support.
Choose ZeroSSL if…
Best for small businesses or teams wanting a UI, API, and optional paid support or longer‑validity certificates.
Common questions
Can I get a wildcard certificate for free?
Let’s Encrypt does not offer free wildcard certificates; ZeroSSL provides wildcard certificates only with paid plans.
Is there any support if I run into issuance problems?
Let’s Encrypt has no phone or email support; ZeroSSL offers paid enterprise support and SLA-backed assistance.
Do both services work with automated renewal tools?
Yes, both support the ACME protocol for automated issuance and renewal.