# Let's Encrypt (ISRG)
> Let's Encrypt is a non-profit certificate authority (CA) that provides X.509 certificates for Transport Layer Security (TLS) encryption at no charge. It is the world's largest certificate authority, aiming to create a more secure and privacy-respecting Web by making it possible to adopt HTTPS easily and automatically.
- URL: https://optimly.ai/brand/let-s-encrypt-isrg
- Slug: let-s-encrypt-isrg
- BAI Score: 94/100
- Archetype: Challenger
- Category: Cybersecurity
- Last Analyzed: April 10, 2026
## Competitors
- Cloudflare Ssltls (https://optimly.ai/brand/cloudflare-ssltls)
- DigiCert (https://optimly.ai/brand/digicert)
- Sectigo Formerly Comodo (https://optimly.ai/brand/sectigo-formerly-comodo)
- Zerossl (https://optimly.ai/brand/zerossl)
## AI-Suggested Alternatives
- Commercial Certificate Authorities (https://optimly.ai/brand/commercial-certificate-authorities)
- Http Only (https://optimly.ai/brand/http-only)
- Managed Infrastructure Ssl (https://optimly.ai/brand/managed-infrastructure-ssl)
- Self Signed Certificates (https://optimly.ai/brand/self-signed-certificates)
## Buyer Intent Signals
Problems: Self-Signed Certificates: Using self-signed certificates for internal or development environments, though these trigger browser warnings for public users. | HTTP Only: Running a website over HTTP, which results in 'Not Secure' browser warnings and negative SEO impact.
Solutions: how to get a free ssl certificate | automated ssl renewal tools | what is a non-profit certificate authority | secure website with acme protocol | best enterprise EV certificate provider | Commercial Certificate Authorities: Purchasing traditional EV (Extended Validation) or OV (Organization Validated) certificates from commercial vendors like DigiCert or Sectigo. | Managed Infrastructure SSL: Relying on hosting providers (e.g., Cloudflare, AWS) to manage SSL/TLS certificates automatically through their own infrastructure.