DigiCert is one of the world's largest enterprise certificate authorities with ~35% market share, serving 80%+ of the Fortune 100. It offers DV/OV/EV SSL/TLS certificates, code signing, and PKI solutions, known for its powerful CertCentral management platform and API automation.
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Sectigo (formerly Comodo CA) is the world's largest commercial certificate authority with over 100 million certificates issued across 150+ countries, offering cost-effective SSL certificates, the SCM management platform, and comprehensive IoT/PKI solutions.
DigiCert is the world\'s largest enterprise SSL/TLS certificate authority, serving 90%+ of Fortune 500 companies. Headquartered in Lehi, Utah, USA, it is one of the most trusted CAs with industry-leading root certificate compatibility and brand trust.
Sectigo SSL is the SSL certificate product line of Sectigo (formerly Comodo CA), offering the PositiveSSL budget DV entry point and full DV/OV/EV/Wildcard coverage — the most cost-effective commercial CA choice.
Certum is a Polish Certificate Authority under Asseco Data Systems, founded 2002 in Poznań, Poland — one of few European CAs with its own trusted root — providing affordable SSL/TLS certificates, code signing, and eIDAS-qualified digital signatures.
Thawte is a well-known certificate authority founded in 1995 in South Africa, now a DigiCert sub-brand offering full DV/OV/EV SSL and code signing certificates, with OV starting at $80/yr and unique brand heritage in African SSL markets.
SSLS (SSL.com) is a US-based certificate authority with its own root infrastructure, offering DV/OV/EV SSL/TLS, code signing, document signing, and email certificates with ACME automation and a Chinese management panel — at 30%-50% below top-tier CA pricing.
SSL.com is a Houston Texas-based Certificate Authority founded in 2002, offering affordable DV/OV/EV SSL certificates from $39.95/yr, S/MIME, code signing, and enterprise PKI solutions.
Founded in 2003, CAcert is a community-driven open-source certificate authority offering free SSL/TLS server certificates, code signing certificates, and email certificates with fully transparent operations.