What is the best alternative to Certainly?

By number of websites, the most widely used alternatives to Certainly are Let's Encrypt, Google Trust Services, DigiCert, Amazon, Sectigo. The right one depends on your needs; compare them on adoption, authority, and audience above.

How many alternatives to Certainly are there?

Site Stats Database tracks 33 other ssl certificate authorities used by 100 or more websites, plus a long tail of rarer ones. Certainly itself is used by 776 websites.

Which SSL certificate authority has the most websites?

Let's Encrypt leads this category with 466,882 websites in our catalog.

Where does this data come from?

Adoption is counted from Site Stats Database's own crawl; authority (Ahrefs Domain Rating) and traffic come from Ahrefs and DataForSEO. Everything reflects the sites we track and refreshes at least monthly.

Certainly Alternatives & Competitors

Last updated July 1, 2026 · refreshes automatically as new data lands.

Looking for an alternative to Certainly? Site Stats Database tracks 33 other ssl certificate authorities; the top ones are below, ranked by adoption, with authority and traffic for each and the leading sites that use them. Certainly itself is used by 776 websites. Back to Certainly.

SSL Authority	Websites	Share	Median DR	Median traffic	Compare

Certainly Alternatives & Competitors

The top Certainly alternatives in depth

Let's Encrypt

Google Trust Services

DigiCert

Amazon

Sectigo

GoDaddy

GlobalSign

Starfield Technologies, Inc.

ZeroSSL

Entrust

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