Let's Encrypt vs Cisco WSA: What are the differences?
Developers describe Let's Encrypt as "A free, automated, and open Certificate Authority (CA)". It is a free, automated, and open certificate authority brought to you by the non-profit Internet Security Research Group (ISRG). On the other hand, Cisco WSA is detailed as "Superior defense against Internet-based threats". Advanced threats can hide on legitimate websites. Users may inadvertently put your organization at risk by clicking where they shouldn't. It protects you by automatically blocking risky sites and testing unknown sites before allowing users to click on them.
Let's Encrypt and Cisco WSA are primarily classified as "Certificate Authority" and "Security" tools respectively.